Powertrain, generic · Hybrid propulsion

P0C2E Electric/Auxiliary Transmission Fluid Pump Control Module Feedback Signal High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C2E means the feedback line from the auxiliary pump control module sits above its valid range, for example shorted to supply voltage or no longer pulled down by the module. No manufacturer documents this exact code publicly. GM's use of the siblings shows what the line carries: on the Two-Mode hybrids P0C2B watches a status message from the pump controller every 1.5 s, Type B, and on the Chevrolet Bolt EV and EUV bulletin 21-NA-148 links the low variant P0C2D to bad solder joints inside the pump. A stuck-high line can hide real pump faults, so the controller usually stops relying on the pump. CARB requires circuit checks for such signals. P0C2D is the low side, P0C2C the plausibility check, P0C25 the high fault on the command line.

Likely causes

Feedback line shorted to supply voltage
Output stage of the pump control module no longer switching
Lost ground at the pump module letting the line float high

Symptoms

  • MIL or Service Vehicle Soon lamp
  • Start-stop or electric drive restricted

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,200
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

P0C2BP0C2CP0C2DP0C25P2797

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