Volvo 850 DTC Codes

Complete reference for 724 diagnostic trouble codes across 19 subsystems of the Volvo 850 platform (1991-1997). Volvo 850 uses ISO 9141-2 K-Line diagnostics with proprietary byte-level codes rather than standard SAE J2012 P-codes — this table maps the raw byte values to their internal Volvo designation and meaning.

ABS (Antilock Brakes) 45 codes

Raw byte	Code	Description	Troubleshooting tip
`0x05`	`313`	Left Rear Wheel Sensor, open/short?	or bad ABS module solders or ignition switch
`0x10`	`311`	Left Front Wheel Sensor, open/short	or bad ABS module solders or ignition switch
`0x11`	`321`	Left Front Wheel Sensor, irregular > 25 mph	interference or excess oscillation > 40 km/h; or bad ABS module solders or ignition switch
`0x12`	`—`	Left Front Wheel Sensor?	or bad ABS module solders or ignition switch
`0x13`	`211`	Left Front Wheel Sensor, wrong wheel speed	signal absent yet circuit intact, or signal absent when moving off; or bad ABS module solders or ignition switch
`0x14`	`221`	Left Front Wheel Sensor, ABS control phase too long	signal absent in ABS function, yet circuit intact; or bad ABS module solders or ignition switch
`0x15`	`—`	Left Front Wheel Sensor?	or bad ABS module solders or ignition switch
`0x20`	`312`	Right Front Wheel Sensor, open/short	or bad ABS module solders or ignition switch
`0x21`	`322`	Right Front Wheel Sensor, irregular > 25 mph	interference or excess oscillation > 40 km/h; or bad ABS module solders or ignition switch
`0x22`	`—`	Right Front Wheel Sensor?	or bad ABS module solders or ignition switch
`0x23`	`212`	Right Front Wheel Sensor, wrong wheel speed	signal absent yet circuit intact, or signal absent when moving off; or bad ABS module solders or ignition switch
`0x24`	`222`	Right Front Wheel Sensor, ABS control phase too long	signal absent in ABS function, yet circuit intact; or bad ABS module solders or ignition switch
`0x25`	`—`	Right Front Wheel Sensor?	or bad ABS module solders or ignition switch
`0x30`	`313`	Left Rear Wheel Sensor, open/short	or bad ABS module solders or ignition switch
`0x31`	`323`	Left Rear Wheel Sensor, irregular > 25 mph	interference or excess oscillation > 40 km/h; or bad ABS module solders or ignition switch
`0x32`	`—`	Left Rear Wheel Sensor?	or bad ABS module solders or ignition switch
`0x33`	`213`	Left Rear Wheel Sensor, wrong wheel speed	signal absent yet circuit intact, or signal absent when moving off; or bad ABS module solders or ignition switch, or stuck emergency brake
`0x34`	`223`	Left Rear Wheel Sensor, ABS control phase too long	signal absent in ABS function, yet circuit intact; or bad ABS module solders or ignition switch
`0x35`	`—`	Left Rear Wheel Sensor?	or bad ABS module solders or ignition switch
`0x40`	`314`	Right Rear Wheel Sensor, open/short	or bad ABS module solders or ignition switch
`0x41`	`324`	Right Rear Wheel Sensor, irregular > 25 mph	interference or excess oscillation > 40 km/h; or bad ABS module solders or ignition switch
`0x42`	`—`	Right Rear Wheel Sensor?	or bad ABS module solders or ignition switch
`0x43`	`214`	Right Rear Wheel Sensor, wrong wheel speed	signal absent yet circuit intact, or signal absent when moving off; or bad ABS module solders or ignition switch, or stuck emergency brake
`0x44`	`224`	Right Rear Wheel Sensor, ABS control phase too long	signal absent in ABS function, yet circuit intact; or bad ABS module solders or ignition switch
`0x45`	`—`	Right Rear Wheel Sensor?	or bad ABS module solders or ignition switch
`0x50`	`411`	Left Front Wheel Inlet Valve, circuit open/short	bad wiring, hydraulic modulator, ABS module, or ignition switch
`0x51`	`413`	Right Front Wheel Inlet Valve, circuit open/short	bad wiring, hydraulic modulator, ABS module, or ignition switch
`0x52`	`421`	Rear Wheels Inlet Valve, circuit open/short	bad wiring, hydraulic modulator, ABS module, or ignition switch
`0x54`	`412`	Left Front Wheel Return Valve, circuit open/short	bad wiring, hydraulic modulator, ABS module, or ignition switch
`0x55`	`414`	Right Front Wheel Return Valve, circuit open/short	bad wiring, hydraulic modulator, ABS module, or ignition switch
`0x56`	`422`	Rear Wheels Return Valve, circuit open/short	bad wiring, hydraulic modulator, ABS module, or ignition switch
`0x60`	`423`	TRACS Valve, circuit open/short	bad wiring, hydraulic modulator, ABS module, or ignition switch
`0x61`	`424`	TRACS Pressure Switch, circuit open/short?	or bad wiring, hydraulic modulator, brake light switch, ABS module, ignition switch, or blown fuse 12 (STOP LAMPS)
`0x64`	`141`	Brake Pedal Sensor, short	or bad ABS module solders, wiring, brake pedal sensor, or ignition switch
`0x65`	`142`	Brake Light/Pedal Switch, open/short or adjustment	or brake light bulb, bad ABS module solders, wiring, or ignition switch
`0x66`	`144`	TRACS Disengaged to Avoid Front Brake Discs Overheating	NULL
`0x67`	`143`	Missing or Faulty Vehicle Speed Signal from ABS module	or bad ABS module solders, ABS module memory fault, or otherwise faulty ABS module or ignition switch
`0x70`	`443`	Pump motor fault	or fuse 9 (ABS PUMP MOTOR), pump power plug not seated properly, bad wiring (eg, insulation that falls off, any short/open), bad ABS module solders, combination relay, hydraulic modulator, ignition switch\n\nAdvanced command(s) ABS tests may not be able to be used if this code has been set.\n\nS40/V40 with Chassis number up to 414999 has defective power supply cable if ABS-441 and ABS-443 has been detected at the same time.\n Cable Harness -1997 P/N 30618007\nCable Harness 98-1999 P/N 30889999
`0x72`	`431`	ABS Module, general hardware fault	or bad ABS module solders or ignition switch
`0x75`	`432`	ABS Module, general interference fault	or bad ABS module solders or ignition switch; see 'https://www.matthewsvolvosite.com/forums/viewtopic.php?f=1&t=78577&start=30#p428745'
`0x77`	`433`	Battery Voltage, too high	NULL
`0x80`	`441`	ABS Microprocessors, redundant calculations mismatch	or fuse 14 (ABS MAIN SUPPLY), bad ABS module solders, wheel sensor wiring close to interference, ignition switch\nS40/V40 with Chassis number up to 414999 has defective power supply cable if ABS 441 and ABS 443 has been detected at the same time.\n Cable Harness up to 1997 P/N 30618007\nCable Harness 98 to 1999 P/N 30889999
`0x81`	`444`	ABS Module, internal valve reference voltage error or no power to hydraulic valves?	or bad wiring, bad ABS module solders, combination relay, hydraulic modulator, ignition switch, or bad ABS module
`0x82`	`442`	ABS Module, leakage current or Hydraulic Modulator Pump Pressure, too low?	or bad wiring, bad ABS module solders, combination relay, hydraulic modulator, ignition switch, or bad ABS module
`0x83`	`445`	ABS Module, either inlet or return valve circuit fault?	or bad wiring, bad ABS module solders, combination relay, hydraulic modulator, ignition switch, or bad ABS module

ADD 28 codes

Raw byte	Code	Description	Troubleshooting tip
`0x31`	`801`	Coolant Temperature Sensor, Signal too High	NULL
`0x32`	`802`	Coolant Temperature Sensor, Signal too Low	NULL
`0x33`	`803`	Coolant Temperature Sensor, Signal faulty	NULL
`0x34`	`142`	Outside Temperature Sensor, Signal too High	NULL
`0x35`	`143`	Outside Temperature Sensor, Signal too Low	NULL
`0x36`	`811`	Flame Sensor, Signal too Low during run	NULL
`0x37`	`899`	Factory set DTC, no fault with heater	NULL
`0x38`	`812`	Flame Sensor, Signal too High during start	NULL
`0x39`	`813`	Flame Sensor, Signal too High	NULL
`0x3A`	`821`	Water Pump, Signal too High	NULL
`0x3B`	`822`	Water Pump, Signal too Low	NULL
`0x3C`	`814`	Combustion fan, Signal too High	NULL
`0x3D`	`815`	Combustion fan, Signal too Low	NULL
`0x3E`	`816`	Combustion fan, Faulty Signal	NULL
`0x3F`	`825`	Fuel Pump, Signal too High	NULL
`0x40`	`826`	Fuel Pump, Signal too Low	NULL
`0x41`	`831`	Overheat Protection Thermostat, Signal too Low	NULL
`0x42`	`841`	Power Supply, Short Circuit to Supply	NULL
`0x43`	`842`	Power Supply, Open Circuit	NULL
`0x44`	`851`	Blower Fan, Signal too High	NULL
`0x45`	`852`	Blower Fan, Signal too Low	NULL
`0x46`	`861`	Glow Plugs, Short or Open Circuit	NULL
`0x47`	`843`	Control Module Power Supply, Signal too High	NULL
`0x48`	`832`	Overheat Protection Thermostat, Faulty Signal	NULL
`0x49`	`891`	Too many Unsuccessful Start Attempts	NULL
`0x4A`	`113`	Control Module, Parameter Fault	NULL
`0x4B`	`112`	Control Module, General Fault	NULL
`0x51`	`898`	Factory set DTC, no fault with heater	NULL

AW50 Transmission 56 codes

Raw byte	Code	Description	Troubleshooting tip
`0x02`	`122`	Shift Solenoid S1 circuit, open	(P0750) eg, bad wiring or solenoid, poor terminal contact at TCM connector, bad TCM, or low/dirty fluid
`0x03`	`121`	Shift Solenoid S1 circuit, short to ground	(P0750) eg, bad wiring, solenoid, or TCM, or low/dirty fluid
`0x08`	`222`	Shift solenoid S2 circuit fault	(P0755) eg, bad wiring (see OTP Volvo 850 DVD/USB TP-4312031 p157), bad solenoid, poor terminal contact, bad TCM, or low/dirty fluid
`0x09`	`221`	Shift solenoid S2 circuit, short to ground	(P0755) eg, bad wiring or solenoid, or low/dirty fluid
`0x0D`	`123`	Line Pressure Solenoid STH circuit, short to supply	(P0745) eg, bad wiring or TCM, bad solenoid, or low/dirty fluid
`0x0E`	`132`	TCM Fault, amplifier STH short circuit	(P0745) eg, poor terminal contact at TCM connector, open circuit in TCM voltage supply or grounds, bad TCM, or low/dirty fluid
`0x0F`	`131`	Line Pressure Solenoid STH circuit, short to ground or open	eg, bad wiring, bad solenoid, poor terminal contact, bad TCM, or low/dirty fluid
`0x12`	`331`	Lock-up solenoid SL circuit, short to supply	(P0740 if USA/Canada model year >= 1997)
`0x13`	`332`	Lock-up solenoid SL, open circuit	(P0740 if USA/Canada model year >= 1997) open in signal cable, bad solenoid, open in power ground, poor terminal contact, bad TCM
`0x14`	`333`	Lock-up solenoid SL circuit, short to ground	(P0740 if USA/Canada model year >= 1997)
`0x17`	`213`	Throttle Position Sensor signal too high	(P0120) >5.4 V for ~10 sec; eg, TPS signal short to supply, TPS sensor circuit failure
`0x18`	`223`	Throttle Position Sensor signal too low	(P0120) <0.1 V for ~10 sec; or unplugged - no signal; eg, TPS disconnected, TPS signal short to ground, poor terminal contact, TPS sensor circuit failure\nAfter repairs must they be verified by:\n\n-Ignition on\n-Push down the accelerator pedal to wide open throttle (WOT) and keep it fully depressed.\n-Wait 15 seconds.\n Read off the status DTC.\n\n\nIf the fault is intermittent the indicator and warning lamp will go out after the ignition has been switched on and off a certain number of times. Up to five times.\n\n\n TCM may ask ECM to turn on MIL light.
`0x1C`	`143`	Kickdown switch circuit, signal too low	see 'https://www.matthewsvolvosite.com/forums/viewtopic.php?f=1&t=71168&start=10#p485175' for possible sources
`0x1F`	`232`	Vehicle Speed Signal is missing or incorrect	(P0500) see OTP Volvo 850 DVD/USB TP-4312031 p32, p45, pp183-192, pp403-404 for details
`0x23`	`311`	Transmission RPM Sensor, no signal	(P0175) when vehicle speed > ~15 mph/~25 km/h; eg, open or short circuit from bad wiring, bad Transmission RPM Sensor, poor terminal contact
`0x28`	`321`	Gear 1 incorrect ratio	(P0731) see OTP Volvo 850 DVD/USB TP-4312031 p231 for possible causes
`0x29`	`322`	Gear 2 incorrect ratio / Alternatively, on earlier models: Gear Ratio Info Incorrect	(P0732/P0730) see OTP Volvo 850 DVD/USB TP-4312031 p231 for possible causes
`0x2A`	`323`	Gear 3 incorrect ratio / Alternatively, on earlier models: Lock-up slips or is not engaged	(P0733) see OTP Volvo 850 DVD/USB TP-4312031 p231 for possible causes
`0x2B`	`324`	Gear 4 incorrect ratio	(P0734) see OTP Volvo 850 DVD/USB TP-4312031 p231 for possible causes
`0x2F`	`341`	Lock-up function, slipping or not engaged	(P0740 if USA/Canada model year >= 1997) lock-up activated, yet >100 rpm difference between Engine RPM and Transmission RPM; TCM vs. ECM mismatch, poor terminal contact, mechanical fault in transmission
`0x35`	`114`	Mode Selector Switch, Signal too High	short circuit to supply, driving mode selector module, or cluster fault feeding transmission fault light; eg, poor terminal contact, open circuit or short circuit to supply, poor TCM connector terminal contact, driving mode selector module, or cluster fault feeding transmission fault light
`0x36`	`124`	Mode Selector Switch, faulty or short circuit to ground	eg, 'W' button depressed > 25 sec, controls sticking, loose parts, bad resistance, bad wiring
`0x37`	`122`	Shift Solenoid S1 circuit	NULL
`0x38`	`123`	Line pressure solenoid STH circuit	NULL
`0x39`	`313`	Gearshift Position Sensor, faulty signal	(P0705) eg, bad wiring, incorrect adjustment, bad gear-shift position sensor, or terminal contact resistance
`0x3A`	`131`	Line pressure solenoid STH	NULL
`0x3B`	`132`	Control Module amp STH	NULL
`0x3C`	`134`	engine load signal incorrect	missing Load Signal from ECM when Transmission Input RPM > 600 rpm; bad wiring, poor terminal contact
`0x3D`	`141`	Oil Temp Sensor	NULL
`0x3E`	`142`	Oil Temp Sensor	NULL
`0x3F`	`245`	Torque limiting request not acked by ECM	eg, open in signal cables TC1/TC2/TCM, short to ground or supply in signal cables TC1/TC2/TCM, terminal contact resistance
`0x40`	`213`	Throttle Position	NULL
`0x41`	`221`	Shift solenoid S2 circuit	NULL
`0x42`	`235`	ATF Temperature too high	>150 C for ~5 sec / >302 F for ~5 sec; Transmission warning light blinks until temp <140 C / <284 C
`0x43`	`141`	ATF Temperature Sensor signal too low	<0.2 V for 25 sec; eg, short to ground in signal circuit, bad ATF Temp Sensor, lock-up may fail
`0x44`	`142`	ATF Temperature Sensor signal too high	ATF Temp < -10 C when engine started and did not change after engine on for 10 min; eg, open in signal cable or ground lead, short to supply in signal cable, bad ATF Temp Sensor, bad resistance, etc
`0x45`	`235`	Oil Temperature	NULL
`0x46`	`—`	Torque Reduction Signal too Low (V70) / Torque limiting circuit?	NULL
`0x47`	`—`	Torque Reduction Signal too High (V70) / Transmission RPM signal missing or incorrect?	NULL
`0x48`	`—`	Control Module Communication / Gear position sensor?	NULL
`0x49`	`412`	Control Module memory fault	(P0601 if USA/Canada model year >= 1997) eg, low battery power, bad TCM
`0x4A`	`322`	Gear 2 incorrect ratio	NULL
`0x4B`	`323`	Gear 3 incorrect ratio	NULL
`0x4C`	`324`	Gear 4 incorrect ratio	NULL
`0x4D`	`331`	Lock-up solenoid SL circuit	NULL
`0x4E`	`332`	Lock-up solenoid SL circuit	NULL
`0x4F`	`333`	Lock-up solenoid SL circuit	NULL
`0x50`	`411`	Control Module EEPROM fault	eg, low battery power, bad TCM
`0x51`	`421`	Battery Volts too low	no supply voltage to TCM #A10 for ~10 sec; eg, open in supply circuit, poor terminal contact, bad TCM
`0x55`	`511`	TCM-ECM Communication Fault	NULL
`0x60`	`522`	TCM-ECM Communication Fault	NULL
`0x61`	`523`	TCM-ECM Communication Fault	NULL
`0x62`	`524`	TCM-ECM Communication Fault	NULL
`0x63`	`525`	TCM-ECM Communication Fault	NULL
`0x64`	`526`	TCM-ECM Communication Fault	NULL
`0xE0`	`527`	TCM-ECM Communication Fault	NULL

CCU (Climate Control) 35 codes

Raw byte	Code	Description	Troubleshooting tip
`0x03`	`110`	Control Module, Internal Malfunction / Parameter faults, Intermittent fault	NULL
`0x04`	`111`	Control Module, Internal Malfunction / Parameter faults, Permanent fault	NULL
`0x05`	`120`	Convertible Top Position Sensor, Invalid Position	NULL
`0x06`	`121`	Convertible Top Position Sensor, Angle fault	NULL
`0x07`	`130`	Convertible Top Movement, Time Limit	Movement is too slow
`0x08`	`140`	Motor Relay, faulty signal	NULL
`0x09`	`150`	Control Unit Power Supply, Signal too Low	Battery voltage is < 9V for more than 1 seconds
`0x0A`	`160`	Control Unit Power Supply, Signal too High	Battery voltage is > 16V for more than 1 seconds
`0x0B`	`170`	Control Unit Power Supply, Signal Missing	Battery voltage missing for power supply
`0x10`	`210`	Speed Signal, Signal missing	No speed signal to the control module 10 seconds after the ignition is turned on -- Comes from COMBI/CDM
`0x13`	`211`	Convertible Top Switch UP/DOWN, faulty signal	Both signals at the same time or if one becomes continuously low.
`0x14`	`212`	Front Lock Micro Switch, faulty signal	wrong signal from microswitch, jammed or shorted
`0x15`	`213`	Front Latch Arm (rear) Micro Switch, faulty signal	wrong signal from microswitch, jammed or shorted
`0x16`	`214`	Front Latch Arm (front) Micro Switch, faulty signal	wrong signal from microswitch, jammed or shorted
`0x17`	`215`	Rear Latch Arm Micro Switch, faulty signal	if tension bow striker plate is down in the rear hatches but none microswitches indicate open
`0x1A`	`216`	Cover (latch) Micro Switch, faulty signal	wrong signal from microswitch, jammed or shorted
`0x1B`	`217`	Tension Bow Micro Switches, faulty signal	wrong signal from microswitch, jammed or shorted
`0x20`	`220`	Convertible Top Position Sensor, Signal too Low	NULL
`0x21`	`221`	Convertible Top Position Sensor, Signal too High	NULL
`0x22`	`222`	Rear Latch Arm Position Sensor, Signal too Low	NULL
`0x23`	`223`	Rear Latch Arm Position Sensor, Signal too High	NULL
`0x30`	`230`	Convertible Top Control Unit Outputs, Signal too High	Warning Signal Buzzer, Trunk lid inhibitor, Side Windows Down, Heated Rear Window.
`0x31`	`231`	Air Conditioning Signal too Low	NULL
`0x32`	`232`	Dashboard LED, Signal too Low	NULL
`0x40`	`310`	Motors, Current too High	NULL
`0x41`	`311`	Convertible Top, Closing, Current too High	NULL
`0x42`	`312`	Convertible Top, Opening, Current too High	NULL
`0x43`	`313`	Cover Closing, Current too High	Missing signal from microswitch of cover locking arm results motor running longer.
`0x44`	`314`	Cover Opening, Current too High	Cover plate lock running against a mechanical stop
`0x45`	`315`	Rear Latch Arms, Closing, Current too High	Motors for real locking arms and tensioner rib/bow are activated at the same time
`0x46`	`316`	Rear Latch Arms, Opening, Current too High	NULL
`0x47`	`317`	Front Lock, Closing, Current too High	NULL
`0x48`	`318`	Front Lock, Opening, Current too High	Microswitch signal Front Latch Arm missing?
`0x49`	`319`	Tension Bow, Closing, Current too High	Rear Latch Arms Microswitch signal missing?
`0x4A`	`320`	Tension Bow, Opening, Current too High	Tensioner Rib/Bow Microswitch signal missing?

Combi (Instrument Cluster) 28 codes

Raw byte	Code	Description	Troubleshooting tip
`0x01`	`222`	Vehicle Speed Signal too high	NULL
`0x02`	`221`	Vehicle Speed Signal missing	NULL
`0x03`	`114`	Fuel Level sensor stuck / signal constant for 94 miles	(P0500) usually due to bad ABS module solders
`0x04`	`112`	Fuel Level signal too low / short to ground	NULL
`0x05`	`113`	Fuel Level signal too High / Low Fuel / short to supply	NULL
`0x06`	`121`	Engine Coolant Temperature signal faulty	see http://www.volvotips.com/index.php/850-2/volvo-850-s70-v70-c70-service-repair-manual/volvo-850-instrument-panel-service-repair-manual/
`0x07`	`123`	48-pulse output Speed Signal too high / short to supply	NULL
`0x08`	`143`	48-pulse output Speed Signal too low / short to ground	NULL
`0x09`	`131`	12-pulse Speed Signal too high / short to supply	NULL
`0x0A`	`141`	12-pulse Speed Signal too low / short to ground	NULL
`0x0B`	`132`	Engine RPM signal missing	NULL
`0x0C`	`124`	Engine RPM signal faulty	NULL
`0x0D`	`211`	D+ alternator voltage signal too low / missing for >= 10 sec when > 1000 RPM	NULL
`0x0E`	`133`	Fuel Level Signal To Trip Computer too high / short to supply	NULL
`0x0F`	`142`	Ambient Temperature signal missing	Grey connector sensor at the bumper on 850
`0x10`	`231`	COMBI microprocessor internal fault	NULL
`0x11`	`174`	Wide Disparity in Fuel Levels and/or Fuel Consumption signal missing	DTC rarely seen; (in 850 especially) DTC 11 Freeze Frame sometimes precedes a Low Fuel situation, occasionally follows a Fillup, and oftentimes persists after clearing COMBI DTCs
`0x14`	`—`	Fuel Consumption signal?	NULL
`0x15`	`—`	Fuel Consumption signal?	NULL
`0x16`	`—`	Fuel Consumption signal?	NULL
`0x17`	`—`	Fuel Consumption signal?	NULL
`0x20`	`232`	COMBI is not yet programmed	NULL
`0xF8`	`231`	COMBI microprocessor internal fault	NULL
`0xF9`	`113`	Fuel Level signal too High / Low Fuel / short to supply	NULL
`0xFA`	`112`	Fuel Level signal too low / short to ground	NULL
`0xFB`	`115`	Fuel Level Sensor Circuit Malfunction	NULL
`0xFC`	`415`	Road Speed Signal missing or faulty	NULL
`0xFD`	`414`	Road Speed Signal missing or faulty	NULL

DENSO 63 codes

Raw byte	Code	Description	Troubleshooting tip
`0x1000`	`1000`	Engine control module, internal fault	NULL
`0x1100`	`1100`	Outside temperature sensor	NULL
`0x1200`	`1200`	Intake Air Temperature Sensor	NULL
`0x1300`	`1300`	Mass air flow sensor	NULL
`0x1400`	`1400`	Manifold absolute pressure sensor	NULL
`0x2000`	`2000`	Engine coolant temperature sensor	NULL
`0x2100`	`2100`	Front heated oxygen sensor	NULL
`0x2110`	`2110`	Front heated oxygen sensor, heating	NULL
`0x2120`	`2120`	Front heated oxygen sensor, control element	NULL
`0x2200`	`2200`	Rear heated oxygen sensor	NULL
`0x2210`	`2210`	Rear heated oxygen sensor, heating	NULL
`0x2300`	`2300`	Injector cylinder 1. Faulty signal	NULL
`0x2310`	`2310`	Injector cylinder 2. Faulty signal	NULL
`0x2320`	`2320`	Injector cylinder 3. Faulty signal	NULL
`0x2330`	`2330`	Injector cylinder 4. Faulty signal	NULL
`0x2340`	`2340`	Injector cylinder 5. Faulty signal	NULL
`0x2400`	`2400`	Fuel pump relay	NULL
`0x3000`	`3000`	Camshaft position sensor. Faulty signal	NULL
`0x3100`	`3100`	Engine speed sensor. Faulty signal	NULL
`0x3200`	`3200`	Ignition coil. Faulty signal	NULL
`0x3300`	`3300`	Ignition coil cylinder 1. Faulty signal	NULL
`0x3310`	`3310`	Ignition coil cylinder 2. Faulty signal	NULL
`0x3320`	`3320`	Ignition coil cylinder 3. Faulty signal	NULL
`0x3330`	`3330`	Ignition coil cylinder 4. Faulty signal	NULL
`0x3340`	`3340`	Ignition coil cylinder 5. Faulty signal	NULL
`0x3400`	`3400`	Knock sensor	NULL
`0x3502`	`3502`	Misfire	NULL
`0x3503`	`3503`	Misfire	NULL
`0x4000`	`4000`	Canister purge valve	NULL
`0x4010`	`4010`	EVAP canister shut-off valve. Faulty signal	NULL
`0x4020`	`4020`	Fuel tank pressure sensor	NULL
`0x4038`	`4038`	Brake vacuum. Too low vacuum	NULL
`0x4050`	`4050`	Fuel level sensor. Faulty signal	NULL
`0x4201`	`4201`	Three-way catalytic converter efficiency. Power deterioration	NULL
`0x4308`	`4308`	Leak diagnostic	NULL
`0x5000`	`5000`	Air conditioning pressure sensor	NULL
`0x5200`	`5200`	Starter motor signal	NULL
`0x6000`	`6000`	Air conditioning relay	NULL
`0x6110`	`6110`	Engine cooling fan relay, low speed	NULL
`0x6120`	`6120`	Engine cooling fan relay, high speed	NULL
`0x6200`	`6200`	AACV. Faulty signal	NULL
`0x6207`	`6207`	AACV. Flow too low	NULL
`0x6300`	`6300`	ETS warning lamp. Signal too low	NULL
`0x6310`	`6310`	ETS warning lamp. Signal too high	NULL
`0x6400`	`6400`	Camshaft reset valve	NULL
`0x7110`	`7110`	Engine control module, internal fault. Faulty signal	NULL
`0x7120`	`7120`	Engine control module, internal fault. Faulty signal	NULL
`0x7140`	`7140`	Engine control module, internal fault	NULL
`0x8000`	`8000`	+30-supply to control module. Open-circuit	NULL
`0x8010`	`8010`	Battery voltage	NULL
`0x8400`	`8400`	5 volt power supply	NULL
`0x9150`	`9150`	Throttle position sensor 1. Faulty signal	NULL
`0x9160`	`9160`	Throttle position sensor 2. Faulty signal	NULL
`0x9180`	`9180`	Accelerator pedal position sensor. Faulty signal	NULL
`0x9190`	`9190`	Throttle position. Faulty current	NULL
`0x9200`	`9200`	Cruise control lever	NULL
`0x9300`	`9300`	Clutch pedal position sensor	NULL
`0x9400`	`9400`	Brake pedal sensor	NULL
`0x9520`	`9520`	Accelerator pedal position sensor	NULL
`0x9530`	`9530`	Accelerator pedal position sensor	NULL
`0x9540`	`9540`	Accelerator pedal sensor power supply	NULL
`0xE000`	`0`	Control module communication. Faulty communication	NULL
`0xE003`	`3`	Configuration fault. Faulty configuration	NULL

DSA (Spark Adaptation) 17 codes

Raw byte	Code	Description	Troubleshooting tip
`0x01`	`131`	Torque reduction signal, signal faulty	NULL
`0x02`	`231`	Throttle position sensor signal, signal missing	NULL
`0x03`	`232`	Throttle position sensor signal, signal faulty	NULL
`0x04`	`233`	DTC stored in engine control module	NULL
`0x05`	`221`	Load signal missing	DSA control module registers no pulses from engine control module for approx. 1.5 seconds. Possibility Open circuit, short circuit, contact resistance. DSA warning light and DSA is disengaged.
`0x06`	`222`	Load signal, signal faulty	NULL
`0x07`	`223`	Initiating engine control module, signal faulty	NULL
`0x08`	`224`	DTC stored in engine control module	NULL
`0x09`	`311`	Wheel speed signal left front wheel, signal faulty	NULL
`0x0A`	`312`	Wheel speed signal right front wheel, signal faulty	NULL
`0x0B`	`313`	Wheel speed signal left rear wheel, signal faulty	NULL
`0x0C`	`314`	Wheel speed signal right rear wheel, signal faulty/missing from ABS control module	Signal is usually pulsed between 0V and battery voltage with freq. changes comparable to the wheel speed.\nFault code is registered at above speed 8km/h if the increase of speed of wheel is too great or too little or if other wheel is locked this can cause as well fault code. Notice code may be stored if power supply / ground terminal for ABS control module is defective.
`0x0D`	`212`	Brake light switch, signal faulty	When Brake light switch is not activated the DSA/signal is grounded via brake light bulbs and when activated the switch (and bulbs) receive battery voltage. If ground is lost when engine is running or signal voltage is too low (compared to battery) when activated fault code is stored.
`0x0E`	`211`	Brake light switch, signal too high	NULL
`0x0F`	`121`	DSA switch, Signal too low	NULL
`0x10`	`122`	DSA Warning lamp, signal faulty	NULL
`0x11`	`112`	Control Module, EEPROM fault	NULL

ECC (Electronic Climate) 40 codes

Raw byte	Code	Description	Troubleshooting tip
`0x0A`	`221`	Air distribution damper motor position sensor Signal Low	NULL
`0x0B`	`222`	Air distribution damper motor position sensor Signal High	NULL
`0x13`	`322`	Air distribution damper motor position, no position change	NULL
`0x1A`	`432`	Blower Fan Switch, Signal too Low	NULL
`0x1B`	`433`	Blower Fan Motor, Current too High	NULL
`0x1C`	`411`	Blower fan motor power unit, Faulty Signal / seized or drawing excess current	or blower fan obstruction, or power stage surge protector problem
`0x1F`	`412`	Fan motor passenger comp temp sensor, Signal too Low / Short to Ground	NULL
`0x20`	`121`	Outside Temperature Sensor, Signal too Low	NULL
`0x21`	`122`	Outside Temperature Sensor, Signal too High	NULL
`0x22`	`123`	Passenger compartment temperature sensor, Signal too Low	NULL
`0x23`	`124`	Passenger compartment temperature sensor, Signal too High	NULL
`0x24`	`135`	Engine Coolant Temperature Signal Missing	NULL
`0x25`	`211`	Drivers side Temp damper motor position sensor Signal High	NULL
`0x26`	`212`	Drivers side Temp damper motor position sensor Signal Low	NULL
`0x27`	`231`	Passenger Side Temp damper motor position sensor Signal High	NULL
`0x28`	`232`	Passenger Side Temp damper motor position sensor Signal Low	NULL
`0x29`	`235`	Recirculation damper motor position sensor Signal High	NULL
`0x2A`	`236`	Recirculation damper motor position sensor Signal Low	NULL
`0x2B`	`311`	Drivers side Temp damper motor, open or short in pot circuit	NULL
`0x2C`	`313`	Passenger side Temp damper motor, open or short in pot circuit	NULL
`0x2D`	`317`	Air distribution damper motor, open or short in pot circuit	NULL
`0x2E`	`315`	Recirculation damper motor, open or short in pot circuit	NULL
`0x2F`	`312`	Drivers side temp damper motor, no position change	NULL
`0x30`	`314`	Passenger side temp damper motor, no position change	see 'ac heater system auto.pdf'
`0x31`	`316`	Recirculation damper motor, no position change	NULL
`0x32`	`143`	Passenger compartment temp selector Right, Signal Faulty	NULL
`0x33`	`143`	Passenger compartment temp selector Left, Signal Faulty	NULL
`0x34`	`431`	Blower Fan Switch, Signal too High	NULL
`0x35`	`412`	Interior temperature sensor inlet fan, short to ground	see 'ac heater system auto.pdf'
`0x36`	`413`	Interior temperature sensor inlet fan, open circuit	see 'ac heater system auto.pdf'
`0x37`	`414`	Interior temperature sensor inlet fan, faulty signal	carefully clean out any lint from temp sensor fan(s)
`0x38`	`411`	Blower fan motor power unit, faulty signal	or blower fan obstruction, or power stage surge protector problem
`0x3A`	`420`	ECC Control Module, internal fault in memory circuits	NULL
`0x3B`	`421`	ECC Control Module, internal fault in memory ROM circuits	NULL
`0x3C`	`422`	Self-adjustment damper motors, Drivers temp failed	NULL
`0x3D`	`423`	Self-adjustment damper motors, Passenger temp failed	NULL
`0x3E`	`424`	Self-adjustment damper motors, Air distribution failed	NULL
`0x3F`	`425`	Self-adjustment damper motors, Recirculation failed	NULL
`0x50`	`441`	Program downloading, control module. Not Done	NULL
`0x51`	`442`	Program downloading, control module. Faulty	NULL

EMS2K 53 codes

Raw byte	Code	Description	Troubleshooting tip
`0x0A`	`422`	Atmospheric pressure sensor, Signal Faulty	NULL
`0x0F`	`122`	Intake Air Temperature Sensor Faulty	NULL
`0x12`	`414`	Boost pressure flow too Low	NULL
`0x13`	`121`	Mass Air Flow sensor, Signal Faulty	NULL
`0x15`	`123`	Engine Coolant Temperature sensor, Signal Faulty	NULL
`0x16`	`212`	Front Heated Oxygen sensor, Signal Faulty	NULL
`0x17`	`435`	Front Heated Oxygen sensor, short-term fuel trim Signal Faulty	NULL
`0x18`	`521`	Front Heated Oxygen sensor, preheating circuit Fault	NULL
`0x1A`	`153`	Rear Heated Oxygen sensor, Signal Faulty	NULL
`0x1C`	`522`	Rear Heated Oxygen sensor, preheating circuit Fault	NULL
`0x1E`	`115`	Injector 1, signal faulty	NULL
`0x1F`	`125`	Injector 2, signal faulty	NULL
`0x20`	`135`	Injector 3, signal faulty	NULL
`0x21`	`145`	Injector 4, signal faulty	NULL
`0x24`	`222`	System Relay Control, Signal Faulty	NULL
`0x25`	`512`	Short-term Fuel Trim, changes too quickly	NULL
`0x26`	`232`	Long-term Fuel Trim idling speed	NULL
`0x27`	`231`	Long-term Fuel Trim part load speed	NULL
`0x29`	`153`	Rear Heated Oxygen sensor, Signal Faulty	NULL
`0x2A`	`436`	Rear Heated Oxygen sensor compensation	NULL
`0x2B`	`521`	Front Heated Oxygen sensor, preheating circuit Fault	NULL
`0x2C`	`522`	Rear Heated Oxygen sensor, preheating circuit Fault	NULL
`0x2D`	`242`	Turbocharger Control Valve, Signal Faulty	NULL
`0x32`	`314`	Camshaft position Sensor, Signal Faulty	NULL
`0x38`	`525`	Ignition Coil 1 circuit Faulty	NULL
`0x3A`	`526`	Ignition Coil 2 circuit Faulty	NULL
`0x41`	`143`	Knock Sensor signal faulty	NULL
`0x46`	`543`	Misfire Emission level	NULL
`0x4D`	`545`	Misfire with three-way Catalytic converter damage	NULL
`0x53`	`214`	Engine Speed Sensor faulty	NULL
`0x5A`	`443`	Three-way Catalytic converter effiency	NULL
`0x6B`	`225`	Air Conditioning Pressure Sensor, Signal Faulty	NULL
`0x6F`	`311`	Speedometer, Signal from ABS faulty	NULL
`0x70`	`412`	Throttle Position signal to DSA faulty	NULL
`0x73`	`411`	Throttle Position sensor, signal faulty	NULL
`0x76`	`666`	DTC in automatic transmission control module	NULL
`0x78`	`131`	Engine Speed Sensor, Signal faulty	NULL
`0x7D`	`342`	Air Conditioning Relay, Signal faulty	NULL
`0x7F`	`323`	Malfunction indicator lamp circuit fault	NULL
`0x82`	`516`	Air Conditioning cooling fan circuit fault	NULL
`0x85`	`514`	Engine cooling fan Low-speed, Signal	NULL
`0x87`	`515`	Engine cooling fan High-speed, Signal	NULL
`0x8A`	`226`	Idle Air Control Valve, Signal Faulty	NULL
`0x8C`	`233`	Adaptive idle air trim outside limits	NULL
`0x91`	`337`	Torque Limiting Signal from DSA faulty	NULL
`0x9A`	`353`	Communication with Immobilizer, Faulty Signal	NULL
`0x9B`	`353`	Communication with Immobilizer, Faulty Signal	NULL
`0xA3`	`254`	System Relay Output, circuit faulty	NULL
`0xDC`	`742`	Comms with Trans Control Module faulty	NULL
`0xDD`	`742`	Comms with Trans Control Module faulty	NULL
`0xDE`	`742`	Comms with Trans Control Module faulty	NULL
`0xE0`	`—`	Comms with Trans Control Module faulty	NULL
`0xFE`	`337`	Torque Limiting Signal from DSA faulty	NULL

Immobilizer 23 codes

Raw byte	Code	Description	Troubleshooting tip
`0x01`	`112`	Internal EEPROM memory fault	NULL
`0x02`	`—`	Comm fault with engine ECU	NULL
`0x03`	`—`	No Contact with Antenna	Or wrong antenna. Ex. Immo2 on 850 has 8 Ohms, Immo3 on S/V40 has 3.3 Ohms, V70 has 5 Ohms as rough resistance measurement.\nAntenna is tuned inside IMMO with capacitors and resistors for antennas inductivity to create LC circuit.\nOther reasons:\nThe cable between control module Pin #9 or #10 is short to gnd or +12V.
`0x04`	`—`	No Response from Key Transponder	NULL
`0x05`	`—`	Key Code not in memory	NULL
`0x06`	`223`	Comm fault from Transponder to IMMO Control Module	NULL
`0x07`	`336`	Control circuit to VGLA, fault in VGLA or LED circuit	(P0600)
`0x30`	`334`	Control circuit to Indicator Lamp, fault in circuit	NULL
`0x31`	`335`	Starter Motor Control circuit, fault in circuit	NULL
`0x32`	`324`	VERLOG code missing or mismatch	ECM or CSM module coding
`0x33`	`325`	Faulty Comms with coded starter module (CSM)	NULL
`0x34`	`121`	PIN programming failed	NULL
`0x35`	`225`	Fault Programming Key Code / Key Code verification failed	NULL
`0x36`	`132`	No Key Codes in EEPROM	Live data should say IMMO PROG as not NORM
`0x37`	`122`	Immobilizer not yet programmed	After entering the code this gets automatically erased
`0x38`	`999`	EEPROM error	NULL
`0x51`	`311`	Comms with engine ECU, short to supply in comm link 2 or 4	NULL
`0x52`	`312`	Comms with engine ECU, short to ground in comm link 2 or 4	NULL
`0x53`	`214`	Comms from engine ECU, wrong MIN code	ie, Immobilizer is programmed for a different engine ECU
`0x54`	`321`	Initiating signal from ECM, missing	NULL
`0x55`	`326`	Reply signal from engine control module	NULL
`0xF7`	`333`	Control circuit to VGLA, fault in VGLA or LED circuit	NULL
`0xF8`	`336`	Control circuit to VGLA, fault in VGLA or LED circuit	(P0600)

Motronic 4.4 ECU 93 codes

Raw byte	Code	Description	Troubleshooting tip
`0x09`	`415`	Boost Pressure sensor signal	NULL
`0x0A`	`212`	HO2S sensor signal, front	NULL
`0x0C`	`153`	HO2S sensor signal, rear	(P0136 - faulty, P0137 - low, or P0138 - high)
`0x0D`	`521`	Front HO2S, preheating	NULL
`0x0E`	`522`	Rear HO2S, preheating malfunction	(P0141)
`0x0F`	`435`	Front HO2S slow response	NULL
`0x11`	`425`	Rear HO2S, control (or possibly Temperature warning, level 1)	NULL
`0x13`	`343`	Fuel Pump Relay	NULL
`0x18`	`211`	CO Potentiometer	NULL
`0x1A`	`231`	Long term fuel trim, part load	(P0171 or P0172) defective MAF, fuel pressure high/low (P0171/P0172), elbow at intake manifold (hidden underneath coolant thermostat) or elbow at PTC or vacuum leaks (if P0172), see OTP Volvo 850 DVD, see 7-step checkup in section including '2-3-1 (Adaptive HO2S Control Lean At Part Load)' of 'http://www.volvotips.com/index.php/850-2/volvo-850-s70-v70-c70-service-repair-manual/volvo-850-diagnostics-with-codes-obd/'
`0x1B`	`232`	Long term fuel trim, idling	(P0172 or P0171) elbow at intake manifold (hidden underneath coolant thermostat) or elbow at PTC or vacuum leaks (if P0172), fuel pressure high/low (P0171/P0172), defective MAF, see OTP Volvo 850 DVD, see 10-step checkup in section '2-3-2 (Adaptive HO2S Control Provides Richer Mixture At Idle)' of 'http://www.volvotips.com/index.php/850-2/volvo-850-s70-v70-c70-service-repair-manual/volvo-850-diagnostics-with-codes-obd/'
`0x1D`	`666`	DTC in transmission CM	NULL
`0x28`	`443`	Catalyst efficiency	NULL
`0x31`	`542`	Misfire, multiple cylinders?	NULL
`0x32`	`451`	Misfire, cylinder 1	(P0301)
`0x33`	`452`	Misfire, cylinder 2	(P0302)
`0x34`	`453`	Misfire, cylinder 3	(P0303)
`0x35`	`454`	Misfire, cylinder 4	(P0304)
`0x36`	`455`	Misfire, cylinder 5	(P0305)
`0x37`	`456`	Misfire, cylinder 6	(P0306)
`0x39`	`353`	Immobilizer	NULL
`0x3D`	`544`	Misfire, multiple cylinders?	NULL
`0x3E`	`543`	Misfire, at least one cylinder	(P0300)
`0x3F`	`551`	Misfire with catalyst damage, cylinder 1	(P0301)
`0x40`	`552`	Misfire with catalyst damage, cylinder 2	(P0302)
`0x41`	`553`	Misfire with catalyst damage, cylinder 3	(P0303)
`0x42`	`554`	Misfire with catalyst damage, cylinder 4	(P0304)
`0x43`	`555`	Misfire with catalyst damage, cylinder 5	(P0305)
`0x44`	`556`	Misfire with catalyst damage, cylinder 6	(P0306)
`0x4B`	`545`	Misfire with catalyst damage, at least one cylinder	(P0300)
`0x4D`	`444`	Acceleration sensor signal	(P1307 - low or P1308 - high) see OTP 850 DVD, TP-2318201, p149 and p268, for possible sources
`0x50`	`442`	Pulsed secondary air injection system flow fault	(P0410) see OTP 850 DVD, TP-2308202, p669 and p78 and p316
`0x51`	`448`	Pulsed secondary air injection system pump flow fault	(P0410) see OTP 850 DVD, TP-2308202, p669 and p78 and p361
`0x53`	`446`	Pulsed secondary air injection system valve leakage	(P0410) see OTP 850 DVD, TP-2308202, p669 and p78 and p344
`0x54`	`445`	Pulsed secondary air injection system pump signal	(P0410) see OTP 850 DVD, TP-2318201, p268 and p44
`0x55`	`447`	Pulsed secondary air injection system solenoid valve signal	(P0413 - missing or P0414 - low/high) see OTP 850 DVD, TP-2318201, p268 and p44
`0x56`	`241`	EGR system	NULL
`0x59`	`413`	EGR temperature sensor signal	NULL
`0x5D`	`315`	Canister purge valve leakage	NULL
`0x5E`	`611`	Fuel Tank system, large leakage	(P0455) Pressure in fuel tank does not drop rapidly enough
`0x5F`	`614`	EVAP canister shut off valve flow fault	NULL
`0x60`	`616`	EVAP canister shut off valve signal	NULL
`0x61`	`612`	Fuel Tank system, small leakage	(P0442) While EVAP canister shut-off valve is closed, the canister purge valve is pulsed until reached specific vacuum and this vacuum level has not stayed long enough. Check fuel cap seated and sealed properly, leaking fuel tank, filler pipe, EVAP canister or its shut-off valve, lines connecting any of those, or bad fuel tank pressure sensor
`0x62`	`541`	Canister purge valve signal	NULL
`0x63`	`621`	Fuel tank pressure sensor signal	NULL
`0x65`	`112`	MFI Control Module fault	NULL
`0x67`	`112`	Memory Fault (ROM) In Engine Control Module	NULL
`0x6B`	`132`	Battery Voltage	NULL
`0x6D`	`315`	Canister purge valve leakage	NULL
`0x6E`	`131`	RPM sensor signal missing	on gearbox casing, also known as Crankshaft sensor, should get reading of 200 to 400 Ohms with multimeter. Two pole connector.
`0x6F`	`214`	RPM sensor signal sporadic/faulty	on gearbox casing, also known as Crankshaft sensor, should get reading of 200 to 400 Ohms with multimeter. Two pole connector.
`0x70`	`314`	Camshaft Position sensor signal	(P0340) next to distributor, cannot verify ohm readings as its all over place from 2k to millions of ohms. When cranking you should get 1.5 to 2hz reading. Dont unplug sensor needs power to work. see OTP 850 DVD, TP-2308202, p262 for possible sources
`0x73`	`121`	Mass Air Flow sensor signal	NULL
`0x75`	`411`	Throttle Position sensor signal	NULL
`0x77`	`422`	Atmospheric pressure sensor signal	NULL
`0x78`	`311`	Engine RPM high for too long while no Vehicle Speed measured	(P0500) Speedometer signal faulty; short circuit, open circuit, contact resistance, or faulty speedometer, ABS, or COMBI; see OTP 850 DVD: TP-2308202, p253, p669; see www.volvopedia.de/index.php?title=EFI-311
`0x79`	`355`	Mass air flow sensor, faulty signal	NULL
`0x7A`	`112`	Fault in Engine Control Module NTC switch	NULL
`0x7B`	`123`	Engine Coolant Temperature sensor	(P0116 - faulty, P0117 - low, P0118 - high, or P0115 - missing) see OTP 850 DVD: TP-2308202, p107, p668; see 'http://www.volvopedia.de/index.php?title=EFI-123#Motronic_4.4'
`0x7C`	`251`	Ambient Temperature sensor signal	(P0111 - sporadic, P0112 - low, or P0113 - high) see OTP 850 DVD: TP-2318201, p105, p266
`0x7F`	`112`	Fault in Engine Control Module Temperature	NULL
`0x80`	`432`	Temperature warning, level 1	NULL
`0x81`	`513`	Temperature warning, level 2	NULL
`0x82`	`225`	A/C pressure sensor signal	NULL
`0x96`	`115`	Injector 1	NULL
`0x97`	`125`	Injector 2	NULL
`0x98`	`135`	Injector 3	NULL
`0x99`	`145`	Injector 4	NULL
`0x9A`	`155`	Injector 5	NULL
`0x9B`	`165`	Injector 6	NULL
`0xA4`	`335`	Communication failure between TCM and ECM	(P1618 - High or P1617 - Low/Missing/Faulty) check grounds 31/71, 31/32, 31/33; check TCM pin B15 to M44 pin B26 circuit & connections; see OTP 850 DVD: TP-2308032, pp275-280; TP-2318201, p43, p269
`0xA8`	`223`	Idle Air Control valve opening signal	NULL
`0xA9`	`245`	IAC valve closing signal	NULL
`0xAA`	`233`	Adaptive idle air trim	NULL
`0xB4`	`531`	Power stage group A	NULL
`0xB5`	`532`	Power stage group B	NULL
`0xB6`	`533`	Power stage group C	NULL
`0xB7`	`534`	Power stage group D	NULL
`0xB8`	`536`	Power stage group E	NULL
`0xB9`	`537`	Power stage group F?	NULL
`0xD2`	`143`	Front knock sensor	NULL
`0xD3`	`433`	Rear knock sensor	NULL
`0xDE`	`112`	Fault in Engine Control Module Knock Control	NULL
`0xE1`	`233`	Idle air trim	NULL
`0xE5`	`416`	Boost pressure reduction from TCM	NULL
`0xE6`	`414`	Boost pressure regulation	NULL
`0xED`	`112`	Fault in Engine Control Module NTC switch	NULL
`0xEE`	`432`	Temperature warning, level 1	NULL
`0xEF`	`513`	Temperature warning, level 2	NULL
`0xF1`	`154`	EGR system leakage	NULL
`0xF4`	`535`	Turbocharger control valve signal	NULL
`0xFD`	`514`	Engine coolant fan, low speed	NULL
`0xFE`	`621`	Fuel tank pressure sensor signal	NULL

M44OLD 1 codes

Raw byte	Code	Description	Troubleshooting tip
`0x54`	`445`	Pulsed secondary air injection system pump signal	NULL

MSA (Airbag) 40 codes

Raw byte	Code	Description	Troubleshooting tip
`0x00`	`131`	Engine Speed signal	NULL
`0x01`	`719`	Secondary Engine Speed signal	NULL
`0x02`	`132`	Battery Voltage	NULL
`0x03`	`711`	Needle Lift sensor signal	NULL
`0x04`	`732`	Accelerator Pedal Position sensor signal	NULL
`0x05`	`123`	Engine Coolant Temperature sensor signal	NULL
`0x06`	`122`	Intake Air Temperature sensor signal	NULL
`0x08`	`712`	Fuel Temperature sensor signal	NULL
`0x09`	`415`	Boost Pressure sensor signal	NULL
`0x0A`	`112`	Barometric Pressure signal	NULL
`0x0A`	`112`	Fault in Engine Control Module Barometric Pressure signal	NULL
`0x0B`	`121`	Mass Air Flow sensor signal	NULL
`0x0C`	`743`	Cruise Control switch signal	NULL
`0x0D`	`112`	Fault in Engine Control Module Reference Voltage	NULL
`0x0F`	`112`	Fault in Engine Control Module	NULL
`0x10`	`311`	Vehicle Speed signal discrepancy	neither cruise control nor A/C will activate, possibly due to VSS fault, COMBI->ECM fault, or COMBI fault
`0x11`	`235`	Exhaust gas recirculation controller signal	NULL
`0x12`	`242`	Turbocharger Control Valve signal	NULL
`0x14`	`515`	Engine Coolant Fan, high speed signal	NULL
`0x19`	`713`	Injection Timing, Advance Control Valve signal	NULL
`0x1A`	`323`	Malfunction Indicator Lamp circuit fault	NULL
`0x1B`	`721`	Glowplug Indicator Lamp signal	NULL
`0x20`	`714`	Fuel Shut-off Valve signal	NULL
`0x21`	`730`	Brake Pedal Switch signal	NULL
`0x22`	`731`	Clutch Switch signal	NULL
`0x23`	`724`	Engine Coolant Heater Relay signal	NULL
`0x24`	`112`	Memory Fault (ROM) In Engine Control Module	NULL
`0x26`	`514`	Engine Coolant Fan, low speed signal	NULL
`0x2A`	`725`	Main Relay signal	NULL
`0x2B`	`715`	Fuel Regulation	EVRY mod?
`0x2D`	`726`	Terminal 15-supply to Engine Control Module	NULL
`0x2E`	`716`	Fuel Quantity Actuator signal	EVRY mod? / change fuel filter
`0x2F`	`718`	Ignition Timing Control	NULL
`0x30`	`335`	Communication failure between TCM and ECM	NULL
`0x31`	`353`	Communication failure with Immobilizer	NULL
`0x32`	`742`	Communication failure between TCM and ECM	NULL
`0x33`	`225`	A/C Pressure sensor signal	NULL
`0x34`	`717`	Fuel Quantity Regulator Position sensor signal	EVRY mod?
`0x36`	`732`	Accelerator pedal position sensor signal	NULL
`0xFE`	`131`	Engine Speed signal	NULL

PS (Power Steering) 29 codes

Raw byte	Code	Description	Troubleshooting tip
`0x01`	`112`	Legroom Motor 1, Pot signal too high	NULL
`0x02`	`121`	Backrest Motor 2, Pot signal too high	NULL
`0x03`	`122`	Seat Rear Edge Motor 3, Pot signal too high	NULL
`0x04`	`211`	Seat Front Edge Motor 4, Pot signal too high	NULL
`0x05`	`212`	Legroom Motor 1, Pot signal too low	NULL
`0x06`	`222`	Backrest Motor 2, Pot signal too low	NULL
`0x07`	`223`	Seat Rear Edge Motor 3, Pot signal too low	NULL
`0x08`	`312`	Seat Front Edge Motor 4, Pot signal too low	NULL
`0x09`	`123`	Legroom Motor 1 Movement when not activated	NULL
`0x0A`	`131`	Backrest Motor 2 Movement when not activated	NULL
`0x0B`	`132`	Seat Rear Edge Motor 3 Movement when not activated	NULL
`0x0C`	`133`	Seat Front Edge Motor 4 Movement when not activated	NULL
`0x0D`	`143`	Legroom Motor 1 moves in wrong direction	NULL
`0x0E`	`144`	Backrest Motor 2 moves in wrong direction	NULL
`0x0F`	`214`	Seat Rear Edge Motor 3 moves in wrong direction	NULL
`0x10`	`224`	Seat Front Edge Motor 4 moves in wrong direction	NULL
`0x11`	`323`	Memory 1, Fault in stored memory position	try learn new position
`0x12`	`322`	Memory 2, Fault in stored memory position	try learn new position
`0x13`	`321`	Memory 3, Fault in stored memory position	try learn new position
`0x14`	`424`	Control Panel not connected (spurious; ignore)	NULL
`0x15`	`421`	Fault in control module	NULL
`0x16`	`422`	Battery Voltage too low	NULL
`0x17`	`423`	Control Panel button activated too long	NULL
`0x18`	`411`	Legroom Motor 1 not calibrated	NULL
`0x19`	`412`	Backrest Motor 2 not calibrated	NULL
`0x1A`	`413`	Seat Rear Edge Motor 3 not calibrated	NULL
`0x1B`	`414`	Seat Front Edge Motor 4 not calibrated	NULL
`0x1C`	`331`	Entry position not stored	NULL
`0x1D`	`332`	Original position not stored	NULL

ROP 14 codes

Raw byte	Code	Description	Troubleshooting tip
`0x01`	`412`	Control Module, Internal Fault	NULL
`0x63`	`413`	Transit Safety Catch On	NULL
`0x65`	`427`	ROPS warning Lamp, Faulty Signal	NULL
`0x66`	`428`	ROPS warning Lamp, Signal too High	NULL
`0x67`	`429`	Battery Voltage Signal too Low	NULL
`0x68`	`430`	Solenoids S1, S2, faulty Signal crash bow	NULL
`0x69`	`431`	Left Solenoid S1, Signal too Low	NULL
`0x6A`	`432`	Left Solenoid S1, Signal Missing	NULL
`0x6B`	`433`	Left Solenoid S1, Signal too High	NULL
`0x6D`	`441`	Right Solenoid S2, Signal too Low	NULL
`0x6E`	`442`	Right Solenoid S2, Signal Missing	NULL
`0x6F`	`443`	Right Solenoid S2, Signal too High	NULL
`0x71`	`451`	Solenoids S1, S2, faulty counter Max No. of triggers Done	NULL
`0x78`	`452`	Control Module, handling fault during Self Test	NULL

RTI 11 codes

Raw byte	Code	Description	Troubleshooting tip
`0x10`	`112`	Control Module, Internal Fault Memory circuits	NULL
`0x20`	`113`	Control Module, Internal Fault, Internal comms	NULL
`0x30`	`114`	Control Module, Internal Fault, Display screen comms	NULL
`0x40`	`121`	CD-ROM player, temperature too high	NULL
`0x41`	`122`	CD-ROM player, Internal Fault	NULL
`0x42`	`123`	CD-ROM player, Fault in player circuits	NULL
`0x43`	`125`	CD-ROM player, Fault in player circuits	NULL
`0x44`	`124`	CD-ROM player, Fault in comms signal	NULL
`0x50`	`115`	Control Module, Internal Fault, Internal Comms	NULL
`0x60`	`131`	TMC receiver, faulty signal	NULL
`0x70`	`141`	TMC/FM receiver, faulty signal	NULL

SRS (Supplemental Restraints) 53 codes

Raw byte	Code	Description	Troubleshooting tip
`0x01`	`112`	Crash Sensor Module internal fault	NULL
`0x02`	`211`	Driver Airbag short circuit	NULL
`0x03`	`212`	Driver Airbag open circuit	NULL
`0x04`	`213`	Driver Airbag short to ground	NULL
`0x05`	`214`	Driver Airbag short to supply	NULL
`0x06`	`221`	Passenger Airbag short circuit	NULL
`0x07`	`222`	Passenger Airbag open circuit	NULL
`0x08`	`223`	Passenger Airbag short to ground	NULL
`0x09`	`224`	Passenger Airbag short to supply	NULL
`0x0A`	`231`	Left Seat Belt Tensioner short circuit	NULL
`0x0B`	`232`	Left Seat Belt Tensioner open circuit	NULL
`0x0C`	`233`	Left Seat Belt Tensioner short circuit to ground	NULL
`0x0D`	`234`	Left Seat Belt Tensioner short circuit to supply	NULL
`0x0E`	`241`	Right Seat Belt Tensioner short circuit	NULL
`0x0F`	`242`	Right Seat Belt Tensioner open circuit	NULL
`0x10`	`243`	Right Seat Belt Tensioner short circuit to ground	NULL
`0x11`	`244`	Right Seat Belt Tensioner short circuit to supply	NULL
`0x52`	`127`	SRS Warning Light short circuit to ground or open circuit	NULL
`0x53`	`128`	SRS Warning Light short circuit to supply	NULL
`0x65`	`127`	SRS Warning Light short circuit to ground or open circuit	NULL
`0x66`	`128`	SRS Warning Light short circuit to supply	NULL
`0x67`	`129`	Battery Voltage signal too low	NULL
`0x68`	`213`	Driver airbag short to ground	NULL
`0x69`	`214`	Driver Airbag short to supply	NULL
`0x6A`	`233`	Left Seat Belt Tensioner short circuit to ground	NULL
`0x6B`	`234`	Left Seat Belt Tensioner short circuit to supply	NULL
`0x6C`	`243`	Right Seat Belt Tensioner short circuit to ground	NULL
`0x6D`	`244`	Right Seat Belt Tensioner short circuit to supply	NULL
`0x6E`	`223`	Passenger Airbag short circuit to ground	NULL
`0x6F`	`224`	Passenger Airbag short circuit to supply	NULL
`0x70`	`313`	Left Rear Seat Belt Tensioner signal too low	NULL
`0x71`	`314`	Left Rear Seat Belt Tensioner signal too high	NULL
`0x72`	`323`	Right Rear Seat Belt Tensioner signal too low	NULL
`0x73`	`324`	Right Rear Seat Belt Tensioner signal too high	NULL
`0x78`	`211`	Driver Airbag short circuit	NULL
`0x79`	`212`	Driver Airbag open circuit	NULL
`0x7A`	`231`	Left Seat Belt Tensioner short circuit	NULL
`0x7B`	`232`	Left Seat Belt Tensioner open circuit	NULL
`0x7C`	`241`	Right Seat Belt Tensioner short circuit	NULL
`0x7D`	`242`	Right Seat Belt Tensioner open circuit	NULL
`0x7E`	`221`	Passenger Airbag short circuit	NULL
`0x7F`	`222`	Passenger Airbag open circuit	NULL
`0x80`	`311`	Left Rear Seat Belt Tensioner short circuit	NULL
`0x81`	`312`	Left Rear Seat Belt Tensioner open circuit	NULL
`0x82`	`321`	Right Rear Seat Belt Tensioner short circuit	NULL
`0x83`	`322`	Right Rear Seat Belt Tensioner open circuit	NULL
`0x88`	`210`	Not programmed for Driver Airbag, but airbag detected	NULL
`0x89`	`230`	Not programmed for Left Seat Belt Tensioner, but tensioner detected	NULL
`0x8A`	`240`	Not programmed for Right Seat Belt Tensioner, but tensioner detected	NULL
`0x8B`	`220`	Not programmed for Passenger Airbag, but airbag detected	NULL
`0x8C`	`310`	Unexpected Left Seat Belt Tensioner configuration	NULL
`0x8D`	`320`	Unexpected Right Seat Belt Tensioner configuration	NULL
`0xC7`	`114`	Three collisions registered	NULL

SRS_TEMIC 66 codes

Raw byte	Code	Description	Troubleshooting tip
`0x01`	`112`	Crash Sensor Module internal fault	NULL
`0x65`	`127`	SRS Warning Light short circuit to ground or open circuit	NULL
`0x66`	`128`	SRS Warning Light short circuit to supply	NULL
`0x67`	`129`	Battery Voltage signal too low	NULL
`0x68`	`213`	Drivers airbag short circuit to ground	NULL
`0x69`	`214`	Driver Airbag short circuit to supply	NULL
`0x6A`	`233`	Left Seat Belt Tensioner short circuit to ground	NULL
`0x6B`	`234`	Left Seat Belt Tensioner short circuit to supply	NULL
`0x6C`	`243`	Right Seat Belt Tensioner short circuit to ground	NULL
`0x6D`	`244`	Right Seat Belt Tensioner short circuit to supply	NULL
`0x6E`	`223`	Passenger Airbag short circuit to ground	NULL
`0x6F`	`224`	Passenger Airbag short circuit to supply	NULL
`0x70`	`313`	Left Rear Seat Belt Tensioner signal too low	NULL
`0x71`	`314`	Left Rear Seat Belt Tensioner signal too high	NULL
`0x72`	`323`	Right Rear Seat Belt Tensioner signal too low	NULL
`0x73`	`324`	Right Rear Seat Belt Tensioner signal too high	NULL
`0x74`	`413`	SIPS-bag, left - Signal too low	NULL
`0x75`	`414`	SIPS-bag, left - Signal too high	NULL
`0x76`	`423`	SIPS-bag, right - Signal too low	NULL
`0x77`	`424`	SIPS-bag, right - Signal too high	NULL
`0x78`	`211`	Driver Airbag signal faulty	NULL
`0x79`	`212`	Drivers airbag open circuit	NULL
`0x7A`	`231`	Left Seat Belt Tensioner short circuit	NULL
`0x7B`	`232`	Left Seat Belt Tensioner open circuit	NULL
`0x7C`	`241`	Right Seat Belt Tensioner short circuit	NULL
`0x7D`	`242`	Right Seat Belt Tensioner open circuit	NULL
`0x7E`	`221`	Passenger Airbag short circuit	NULL
`0x7F`	`222`	Passenger Airbag open circuit	NULL
`0x80`	`311`	Left Rear Seat Belt Tensioner signal faulty	NULL
`0x81`	`312`	Left Rear Seat Belt Tensioner signal missing	NULL
`0x82`	`321`	Right Rear Seat Belt Tensioner signal faulty	NULL
`0x83`	`322`	Right Rear Seat Belt Tensioner signal missing	NULL
`0x84`	`411`	SIPS-bag, left - Faulty signal	NULL
`0x85`	`412`	SIPS-bag, left - Signal missing or faulty	NULL
`0x86`	`421`	SIPS-bag, right - Faulty signal	NULL
`0x87`	`422`	SIPS-bag, right - Signal missing or faulty	NULL
`0x88`	`210`	Driver Airbag fault	NULL
`0x89`	`230`	Left Seat Belt Tensioner fault	NULL
`0x8A`	`240`	Right Seat Belt Tensioner fault	NULL
`0x8B`	`220`	Passenger Airbag fault	NULL
`0x8C`	`310`	Left Rear Seat Belt Tensioner fault	NULL
`0x8D`	`320`	Right Rear Seat Belt Tensioner fault	NULL
`0x8E`	`410`	SIPS-bag, left - Faulty signal	NULL
`0x8F`	`420`	SIPS-bag, right - Faulty signal	NULL
`0x90`	`512`	Belt buckle, driver - faulty signal	NULL
`0x91`	`513`	Belt buckle, driver - faulty signal	NULL
`0x92`	`514`	Belt buckle, driver - Signal too high	NULL
`0x93`	`522`	Belt buckle, passenger - faulty signal	NULL
`0x94`	`523`	Belt buckle, passenger - faulty signal	NULL
`0x95`	`524`	Belt buckle, passenger - Signal too high	NULL
`0x96`	`510`	Belt buckle, driver - faulty signal	NULL
`0x97`	`520`	Belt buckle, passenger - faulty signal	NULL
`0xA0`	`605`	Side impact sensor, left - faulty signal	NULL
`0xA1`	`606`	Side impact sensor, left - signal missing	NULL
`0xA2`	`615`	Side impact sensor, right - faulty signal	NULL
`0xA3`	`616`	Side impact sensor, right - signal missing	NULL
`0xA4`	`610`	Side impact sensor, left - faulty signal	NULL
`0xA5`	`620`	Side impact sensor, right - faulty signal	NULL
`0xB0`	`731`	Switch, passenger airbag - faulty signal	NULL
`0xB1`	`732`	Switch, passenger airbag - signal missing or faulty	NULL
`0xB2`	`733`	Switch, passenger airbag - signal too low	NULL
`0xB3`	`730`	Switch, passenger airbag - system configuration	NULL
`0xB9`	`530`	Belt reminder - Signal too high	NULL
`0xC5`	`804`	Crash sensor - credibility test	NULL
`0xC6`	`800`	Hydraulic/mechanical fault - system configuration	NULL
`0xC7`	`114`	Control unit - too many collisions registered	NULL

VGLA 29 codes

Raw byte	Code	Description	Troubleshooting tip
`0x41`	`114`	Control Module, Fault in EEPROM	NULL
`0x42`	`512`	Drivers Door Lock Switch, Unlocking Signal too Low / Short to Ground	NULL
`0x43`	`521`	Drivers Central Locking Switch, Signal too Low / Short to Ground	NULL
`0x49`	`511`	Drivers Door Lock Switch, Locking Signal too Low / Short to Ground	NULL
`0x4A`	`311`	Siren, Faulty Signal	NULL
`0x4C`	`312`	Siren, Internal Battery Fault	NULL
`0x4D`	`321`	Siren, Fault In the Power Supply	NULL
`0x4F`	`415`	Left ultrasonic sensor, Signal Faulty	NULL
`0x51`	`416`	Left ultrasonic sensor, internal Fault	NULL
`0x52`	`531`	Courtesy Lighting, Signal too Low / Short to Ground	NULL
`0x54`	`421`	Glass breakage Sensor, Signal Faulty, to control module	NULL
`0x55`	`422`	Glass breakage Sensor, Signal Faulty, microphone circuit	NULL
`0x56`	`451`	Movement Sensor, Faulty Signal	NULL
`0x57`	`413`	Right ultrasonic sensor, Signal Faulty	NULL
`0x58`	`414`	Right ultrasonic sensor, internal Fault	NULL
`0x59`	`432`	Tilt sensor, Internal fault	NULL
`0x60`	`456`	SRS signal, Signal too Low / Short to Ground	NULL
`0x61`	`452`	ECC afterblow, Signal too High	NULL
`0x62`	`610`	Speed Signal Faulty	NULL
`0x63`	`441`	Resistive wire, Signal too High	NULL
`0x64`	`541`	Ignition Switch, Signal too Low	NULL
`0x65`	`431`	Tilt sensor, Signal too Low	NULL
`0x66`	`454`	Immobilizer, Signal too Low	NULL
`0x67`	`525`	Central Locking switch Passenger Door, Signal too Low	NULL
`0x69`	`522`	Internal Tailgate/Trunk Control Switch, Signal too Low	NULL
`0x6A`	`523`	External Tailgate/Trunk Lock Switch, Signal too Low	NULL
`0x6C`	`524`	Fuel Filler Lock Switch, Signal too Low	NULL
`0x6D`	`113`	Control Module, Control Module Not Programmed	NULL
`0x6E`	`455`	Immobilizer, VGLA code Signal Faulty	NULL

Source: DTC tables compiled from freediag by Richard H. Jones and Aleksi Venäläinen (GPL-2). The Volvo 850 community has maintained these mappings collaboratively for over two decades.

Volvo 850 DTC Codes

ABS (Antilock Brakes) 45 codes

ADD 28 codes

AW50 Transmission 56 codes

CCU (Climate Control) 35 codes

Combi (Instrument Cluster) 28 codes

DENSO 63 codes

DSA (Spark Adaptation) 17 codes

ECC (Electronic Climate) 40 codes

EMS2K 53 codes

Immobilizer 23 codes

Motronic 4.4 ECU 93 codes

M44OLD 1 codes

MSA (Airbag) 40 codes

PS (Power Steering) 29 codes

ROP 14 codes

RTI 11 codes

SRS (Supplemental Restraints) 53 codes

SRS_TEMIC 66 codes

VGLA 29 codes

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