P0C1CElectric/Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0C1C is the general circuit fault of the temperature sensor inside the auxiliary pump control module, used when the signal is invalid without fitting the low, high or range checks. No manufacturer documents it publicly. GM's 2016 ELR pump controller monitors its inverter sensor with own codes P1E34 to P1E36 instead, and the Honda CVT pump patent shows why the reading matters: it is the basis for switching the pump off before the board overheats. Without a valid value the controller cannot protect itself, so the pump usually runs restricted or stays off. CARB requires such sensors to be checked for circuit faults. Because the sensor is on the circuit board, the fix is normally the module or the pump assembly. P0C1D to P0C1F are the specific variants.
- What you may notice
- Warning lamp or transmission message
- Start-stop function inactive
- Likely causes
- LikelyTemperature sensor or its measuring circuit on the module board faulty
- PossibleUnstable supply or ground of the pump module distorting the sensor reading
- RareMoisture or fluid inside the module housing
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €300 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.