Powertrain, generic

P0E1D Hybrid/EV Battery Pack Coolant Pump B Control Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0E1D says pump B accepts its command electrically but the effect the controller looks for does not appear, such as the expected flow, speed or temperature change in its loop. No manufacturer documents P0E1D publicly. The model is pump A on the 2011 Chevrolet Volt: once the pump has run for over 60 s, the pack inlet coolant temperature must have shifted by at least 5 °C, otherwise a Type B code is set. GM bulletin PI0798A traces that pump A code after a drain and refill to trapped air, cleared with a vacuum purge, which is also the first check for pump B after service work. CARB calls for a functional check of battery cooling where feasible. Worn bearings, a clogged inlet or a sensor reading wrongly are further causes. Pump B speed faults may also show as P2CF6 or P2CF7.

Likely causes

Air trapped in the loop after a coolant service
Worn pump B or debris blocking its impeller or inlet
Low coolant level or leak in the battery loop
Coolant temperature sensor giving an implausible value

Symptoms

  • Check engine light on
  • Battery or electronics temperatures higher than normal
  • Gurgling noise from the coolant loop
  • Power or charging rate limited

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–700
Time0.5–3 h

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

Parts involved

hv battery pack coolant pump bwiring harnessbms

Related codes

P0E1AP0E1BP0E1CP0C4AP2CF6P2CF7

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