P2E42Hybrid/EV Electronics Coolant Pump B Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- MIL and hybrid system warning
- Higher inverter or charger temperatures than usual
- Power reduction or slower charging in hot conditions
- Likely causes
- LikelyAir pocket after service or slow coolant loss
- PossibleWorn pump B delivering too little flow
- PossibleDebris, kinked hose or clogged cold plate in the loop
- RareControl software needing an update
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.