P0C9D14 Volt Power Module Current Sensor B Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0C9D means the output current reported by sensor B of the 14 V power module is electrically valid but implausible for the operating state. No manufacturer documents this code publicly. GM's 2013 eAssist table checks this kind of plausibility through the correlation code P0CC5 instead: the output power derived from sensor B is compared with the input power from sensor A multiplied by an efficiency factor between 0.90 and 0.99, and a gap above 0.4 kW for 3.75 s within 5 s sets it, Type B. That test is blocked while P0C9E or P0C9F is active. A sensor with offset or gain drift is the usual reason, rarely a converter whose real output deviates. The driver may notice only a warning lamp or a 12 V battery that stays low.
- What you may notice
- Warning lamp without obvious driveability change
- 12 V battery charge state remaining low
- Likely causes
- LikelyOffset or gain drift of current sensor B
- PossibleHigh resistance at the 12 V output cable or ground
- RareConverter output really differing from the commanded power
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.