P0E1A code meaning
Hybrid/EV Battery Pack Coolant Pump B Control Circuit/Open
Powertrain system Generic code P0Exx codes Check engine light
What P0E1A means
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.
P0E1A at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0E1A
- Check engine light on
- Battery or electronics temperatures rise faster under load
- Reduced power or charging rate
Common causes of P0E1A
- Most likelyBroken wire in the pump B command circuit
- Most likelyLoose or corroded connector at pump B
- PossibleFailed electronics inside pump B
- Less likelyFailed pump output in the controlling module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery pack coolant pump bWiring harnessBms
What each part of P0E1A means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1A | The exact fault in that area. |
What to do next
- Note P0E1A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0E1A
What does P0E1A mean?
P0E1A means "Hybrid/EV Battery Pack Coolant Pump B Control Circuit/Open". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0E1A?
Drive gently and only to a workshop. With P0E1A the car can go into limp mode (reduced power) to protect itself.
Will P0E1A fail an emissions test?
Yes, it can. P0E1A is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0E1A to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P0E1A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.