Powertrain, generic · Hybrid propulsion

P0C2D Electric/Auxiliary Transmission Fluid Pump Control Module Feedback Signal Low

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P0C2D reports that the feedback signal from the electric transmission fluid pump module stays low, below its valid range. GM documents it for the 2021-23 Chevrolet Bolt EV and 2022 Bolt EUV in bulletin 21-NA-148: the driver sees Propulsion Power is Reduced and a Service Vehicle Soon lamp, with P0C2D, P2797 or P2798 stored. The cause is a part quality spill in the low-voltage electric transmission fluid pump on the driver side of the drive unit, where a soldering process was out of specification; the motor is not serviceable, so the complete pump is replaced. In this EV the pump supplies fluid for cooling and lubricating the drive unit. P0C2B is the general feedback code, P0C2C the plausibility and P0C2E the high variant.

Likely causes

Faulty solder joints in the electric transmission fluid pump (Chevrolet Bolt, GM 21-NA-148)
Feedback line shorted to ground
Corroded or loose pump connector

Symptoms

  • Propulsion Power is Reduced message
  • Service Vehicle Soon lamp

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€250–900
Time1–3 h

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

Parts involved

aux trans pump control modulewiring harnesstcm

Related codes

P0C2BP0C2CP0C2EP2797P2798

References: static.nhtsa.gov, static.nhtsa.gov.