Powertrain, generic · Hybrid propulsion

P0C2C Electric/Auxiliary Transmission Fluid Pump Control Module Feedback Signal Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C2C means the feedback signal from the auxiliary pump control module is present and electrically valid but does not make sense, for example a reported speed or status that contradicts the command. No manufacturer documents this exact code publicly. Its siblings show the signal: on GM's Two-Mode trucks P0C2B watches a fault status message expected every 1.5 s, and on the 2021-23 Chevrolet Bolt EV and 2022 Bolt EUV GM bulletin 21-NA-148 pairs P0C2D with the pump performance codes P2797 and P2798, caused by bad solder joints in the low-voltage pump. CARB requires rationality checks for such inputs. Implausible feedback usually points to the pump electronics themselves. P0C2B is the general code, P0C2D and P0C2E the low and high variants.

Likely causes

Electronics of the pump module reporting wrong status or speed
Intermittent contact on the feedback line distorting the signal
Pump not following the command mechanically, so feedback and command differ

Symptoms

  • Service Vehicle Soon or MIL
  • Reduced propulsion power or no start-stop

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–1,200
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

P0C2BP0C2DP0C2EP2797P2798

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