P0E1DHybrid/EV Battery Pack Coolant Pump B Control 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
- P0E1D says pump B accepts its command electrically but the effect the controller looks for does not appear, such as the expected flow, speed or temperature change in its loop. No manufacturer documents P0E1D publicly. The model is pump A on the 2011 Chevrolet Volt: once the pump has run for over 60 s, the pack inlet coolant temperature must have shifted by at least 5 °C, otherwise a Type B code is set. GM bulletin PI0798A traces that pump A code after a drain and refill to trapped air, cleared with a vacuum purge, which is also the first check for pump B after service work. CARB calls for a functional check of battery cooling where feasible. Worn bearings, a clogged inlet or a sensor reading wrongly are further causes. Pump B speed faults may also show as P2CF6 or P2CF7.
- What you may notice
- Check engine light on
- Battery or electronics temperatures higher than normal
- Gurgling noise from the coolant loop
- Power or charging rate limited
- Likely causes
- LikelyAir trapped in the loop after a coolant service
- PossibleWorn pump B or debris blocking its impeller or inlet
- PossibleLow coolant level or leak in the battery loop
- RareCoolant temperature sensor giving an implausible value
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.