Powertrain, generic · Hybrid propulsion

P0C25 Electric/Auxiliary Transmission Fluid Pump Control Module Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C25 reports that the circuit from the controlling module to the auxiliary pump control module sits high, for instance a command wire shorted to battery voltage or an output that cannot pull the line down. No manufacturer documents this exact code publicly. Ford's 2016 F-150 2.7L bulletin shows the type of signal involved: a PCM duty-cycle command that can be swept from 20 to 90 percent to prove pump operation. A line stuck high can be read as a constant full command or rejected as invalid, so the pump may run continuously or be shut off. GM's ELR pump controller also uses a separate wake-up line as enable. CARB requires circuit monitoring of such outputs. P0C23 is the open circuit, P0C24 the low side, P0C2E the high fault on the feedback line.

Likely causes

Command wire shorted to battery or another supply voltage
Output stage in the PCM/TCM stuck high
Input stage of the pump control module faulty

Symptoms

  • MIL or transmission warning
  • Pump runs continuously or start-stop is disabled

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,500
Time0.5–3 h

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

Parts involved

aux trans pump control modulewiring harnesstcm

Related codes

P0C23P0C24P0C2EP2796

References: law.cornell.edu, static.nhtsa.gov, gsi.ext.gm.com.