Powertrain, generic · Hybrid propulsion

P0C1D Electric/Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P0C1D means the internal temperature sensor of the auxiliary pump module delivers an electrically valid value that does not fit the other temperatures in the vehicle. No manufacturer documents this exact code publicly. GM's comparable check on the 2016 ELR pump controller, own code P1E36, runs after at least 6 hours of inactivity: the inverter reading is compared with the average of the power electronics coolant and transmission fluid temperatures, and a difference above 20 °C fails, Type B, MIL after two trips. A sensor that reads too low would let the board overheat unnoticed, which is why the Honda pump patent bases shutdown on this value. P0C1E and P0C1F cover voltage out of range, P0C1B real overtemperature.

Likely causes

Board temperature sensor drifted or measuring circuit out of tolerance
Reference value wrong because the transmission fluid or coolant temperature sensor is faulty
Internal fault of the pump control module

Symptoms

  • MIL after repeated detection
  • Start-stop restricted or unavailable

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,800
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

aux trans pump control module

Related codes

P0C1BP0C1CP0C1EP0C1FP0711

References: law.cornell.edu, gsi.ext.gm.com, patents.google.com.