P0C1F code meaning
Electric/Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit High
Powertrain system Generic code P0Cxx codes Check engine light
What P0C1F means
P0C1F means the internal temperature sensor of the auxiliary pump module delivers a voltage above its valid range, which for an NTC thermistor reads as an implausibly cold board and usually indicates an open sensor path. No manufacturer documents this exact code publicly. GM's ELR pump controller of 2016 shows the matching case under its own code P1E34, labelled circuit high: below -58 °C, near 5 V, for 250 of 350 samples sets the fault, Type B in the ELR tables. With such a value the controller loses its overtemperature protection; the Honda CVT pump patent shows that this protection is what keeps the driver board alive, so the pump is typically restricted. P0C1E is the low side, P0C1D the plausibility check, P0C1B real overtemperature.
P0C1F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P0C1F
- MIL after two drive cycles
- Start-stop restricted, pump in protective mode
Common causes of P0C1F
- Most likelyBoard temperature sensor open or its solder joint cracked
- PossibleMeasuring circuit of the pump control module faulty
- Less likelyGround offset at the pump module shifting the sensor voltage
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Aux trans pump control module
What each part of P0C1F means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C | Area: hybrid propulsion. |
| 1F | The exact fault in that area. |
What to do next
- Note P0C1F and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0C1F
What does P0C1F mean?
P0C1F means "Electric/Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit High". P0C1F means the internal temperature sensor of the auxiliary pump module delivers a voltage above its valid range, which for an NTC thermistor reads as an implausibly cold board and usually indicates an open sensor path. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C1F?
Drive gently and only to a workshop. With P0C1F the car can go into limp mode (reduced power) to protect itself.
Will P0C1F fail an emissions test?
Yes, it can. P0C1F is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0C1F to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P0C1F clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.