Powertrain, generic (extended)

P2E42 Hybrid/EV Electronics Coolant Pump B Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2E42 is the functional verdict on electronics coolant pump B: the circuits test fine, yet the controller concludes the pump is not doing its job. Two ways of reaching that verdict are documented for pump A. For the 2016 Cadillac ELR, GM checks the result, setting P0CEA when power electronics coolant and charger temperatures drift too far apart after the pump has been enabled for more than 300 s. GM's 2018 tables check the pump itself by filtering the gap between commanded and reported speed (P19FC, Type B). No maker documents P2E42. Stellantis cleared a related performance code of a motor electronics pump B, P0C74, on 2023 Renegade and Compass 1.3 PHEV models by reprogramming. Air, debris, a weak pump or software are candidates; CARB asks for a cooling check where feasible.

Likely causes

Air pocket after service or slow coolant loss
Worn pump B delivering too little flow
Debris, kinked hose or clogged cold plate in the loop
Control software needing an update

Symptoms

  • MIL and hybrid system warning
  • Higher inverter or charger temperatures than usual
  • Power reduction or slower charging in hot conditions

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–900
Time0.5–4 h

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

Parts involved

hybrid electronics coolant pump bpower electronics coolant loop

Related codes

P2E47P2E48P2E49P0CEAP0C74

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