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Mode 01 • PID 42

OBD2 PID 0142

Control module voltage

Definition

Mode
01 (hex)
PID
42 (hex)
Data bytes
2
Formula
((A*256)+B)/1000
Range
0 – 65.535 V
Units
V

How to read PID 0142

Send mode 01 with PID 42 over OBD-II. The ECU returns 2 data byte(s), decoded with ((A*256)+B)/1000 (A, B, C, D are the returned bytes in order). The result is “Control module voltage” in V. This is standard SAE J1979 data supported by most OBD-II scan tools and loggers.

Why it matters for tuning

Live PIDs like this are how tuners and workshops verify a remap on the road — logging RPM, load, boost, lambda and temperatures to confirm the map is safe. The desktop Softechpro Solutions software complements live logging with offline ECU editing: DPF/EGR/AdBlue/DTC off and Stage tuning with automatic checksum.

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