P0E1AHybrid/EV Battery Pack Coolant Pump B Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0E1A reports an open or otherwise faulty command circuit for battery coolant pump B, a second electric pump found where the battery loop is split or a separate circuit feeds a chiller or heater. No manufacturer documents P0E1A publicly. For pump A, GM's 2019 tables show how the controller judges such a line by current: while running, below 200 mA or above 3 A is a fault, while off, below 120 µA; failing for 4 s within a 5 s window gives a Type B code. A second pump would usually be monitored the same way. CARB requires every electronic output of battery thermal management to be checked for circuit faults. Usually a wire has parted, a connector has backed out or the pump itself is dead. The low and high cases are P0E1B and P0E1C; supply and speed faults of pump B have their own codes, P2CF4 to P2CF7.
- What you may notice
- Check engine light on
- Battery or electronics temperatures rise faster under load
- Reduced power or charging rate
- Likely causes
- LikelyBroken wire in the pump B command circuit
- LikelyLoose or corroded connector at pump B
- PossibleFailed electronics inside pump B
- RareFailed pump output in the controlling module
- 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: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.