OBD-II DTC · SAE J2012
C05CD
Brake Master Cylinder Piston Position Sensor B Circuit Voltage High
What C05CD means
C05CD is a standard SAE J2012 powertrain diagnostic trouble code with the defined meaning: Brake Master Cylinder Piston Position Sensor B Circuit Voltage High. This is the OEM-agnostic definition; specific manufacturer interpretation may add detail (subsystem, bank, sensor location) but the core meaning is consistent across all OBD-II compliant vehicles since 1996.
Common symptoms when C05CD is active
Engine shake, P0300-P031x family fires repeatedly, MIL flashing under load.
Can this code be suppressed via ECU tuning?
Should NEVER be suppressed. Misfires indicate genuine combustion issues (ignition, injector, mechanical). Suppressing them risks engine damage.
How to remove C05CD with Softechpro V5
Recommended service: Not recommended. Step-by-step workflow:
- Do not suppress misfire codes. Misfire detection is engine-protective — it prevents unburnt fuel from destroying the catalyst.
- Diagnose first: coils, plugs, injectors, compression.
- If the fault is mechanical and intentional (e.g. dead cylinder on a track-only build), Softechpro V5's DTC OFF can suppress the specific cylinder code via the DTC table editor — but the underlying combustion event remains a risk.
Softechpro V5 supports 1,400+ ECU firmwares across Bosch (EDC15, EDC16, EDC17, MD1, MG1, ME7, MED17), Siemens / Continental (SID, SIMOS, EMS), Delphi (DCM, DDC), and Magneti Marelli platforms.