P0C9F14 Volt Power Module Current Sensor B Circuit High
- 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
- P0C9F reports an output current from sensor B of the 14 V power module that exceeds what the converter can plausibly supply. GM's 2013 eAssist table 13OBDG05C sets it once the APM output current reading tops 123 A while calculated APM input power is between 0.25 and 1.8 kW, supply voltage is 9 to 32 V and the vehicle is in run/crank; 1.5 s out of a 2 s window fail it, Type B, two trips. Pairing a very high current with modest input power separates a sensor fault from a genuine heavy load. A signal shorted to voltage or an internal sensor defect is typical. P0C9E is the low counterpart, P0A89 the input sensor's high code, and P0CC5 compares both sensors.
- What you may notice
- Check-engine lamp
- Converter output reduced, 12 V battery discharging
- Likely causes
- LikelyInternal defect of output current sensor B
- PossibleSensor signal shorted to a voltage source
- RarePoor ground of the power module shifting the reading
- 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.