Powertrain, generic

P0E1B Hybrid/EV Battery Pack Coolant Pump B Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0E1B narrows a pump B command fault down to a level below the expected window, normally because the control or PWM wire has a ground fault, or because a driver that cannot raise it. No manufacturer documents P0E1B publicly. The nearest documented relative is P0C48 for pump A, which Ford listed for the 2020 Explorer, Police Interceptor Utility and Lincoln Aviator hybrids and traced to battery energy control module software that is reprogrammed. A software cause of that kind is worth ruling out first before cutting into the harness. Physically, a low reading often comes from insulation rubbed through on a bracket or from coolant wicking into the connector. CARB wants each thermal management output checked for such faults. If pump B stops as a result, the loop it serves loses flow. Open circuit is P0E1A, short to voltage P0E1C.

Likely causes

Pump B control or PWM wire shorted to ground
Coolant or water in the pump connector
Control module software fault, as seen by Ford on the pump A sibling
Internal short at the pump B control input

Symptoms

  • Check engine light on
  • Pump B does not run
  • Power limited when the components it cools get hot

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

P0E1AP0E1CP0E1DP0C48P2CF5

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