Powertrain, generic (extended)

P2E7A Hybrid/EV Electronics Coolant Pump C Overspeed

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P2E7A means the third electronics coolant pump spins faster than the speed it was given. A centrifugal pump that draws air instead of liquid loses its load and races, so a low coolant level, a leak or a poorly bled loop come first, a slipping impeller or false speed feedback later. No manufacturer documents P2E7A. GM's 2019 hybrid tables show how such a fault is caught on its electronics pump: P19FC fails once filtered feedback speed exceeds the command by a calibrated margin, and with the pump switched off a reported speed above 250 rpm in 8 of 10 s also counts. HELLA's MP150e pump detects dry running from speed and start current, stops and stores a fault. Mercedes ties P2B2A7A in the 167 series to air and leaks; Ford keeps overspeed/dry run as fault type B1. Performance of pump C is P2E79.

Likely causes

Coolant level low or air pocket at the pump inlet
Leak or defective seal in the electronics coolant loop
Impeller loose on its shaft or broken
Faulty speed feedback from the pump electronics

Symptoms

  • Coolant or hybrid system warning, possibly MIL
  • Coolant reservoir level dropping, traces of leakage
  • Pump runs loud or churns; power or charging may be reduced

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–1,000
Time0.5–3 h

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

Parts involved

hybrid electronics coolant pump cpower electronics coolant loop

Related codes

P2E79P2E48P2E46P2C67P2D0B

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