Powertrain, generic

P0E1C Hybrid/EV Battery Pack Coolant Pump B Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0E1C is set when the command signal to battery coolant pump B stays above what the controller allows, for instance because the line is shorted to battery voltage or, on a pulled-up PWM input, interrupted. No manufacturer documents P0E1C publicly. Its pump A counterpart P0C49 appears in Ford bulletin 20-2293 for the 2020 Lincoln Aviator hybrid among MIL codes for the coolant pumps, with BECM reprogramming as the fix. In contrast to a ground short, a line held high can either keep a simple on/off pump running continuously or, with PWM pumps that read a steady high as an invalid command, make the pump fall back to a default speed or stop. CARB requires circuit monitoring of thermal management outputs. Look for a wire touching a live feed. P0E1B is the low case, P0E1A the open circuit.

Likely causes

Pump B control wire shorted to battery voltage
Interrupted pulled-up PWM input at the pump
Control module software fault, as Ford found for pump A

Symptoms

  • Check engine light on
  • Pump B runs constantly or not at all
  • Reduced power under heavy load

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–700
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

P0E1AP0E1BP0E1DP0C49P2CF6

References: static.nhtsa.gov, law.cornell.edu.