P0E1D code meaning
Hybrid/EV Battery Pack Coolant Pump B Control Performance
Powertrain system Generic code P0Exx codes Check engine light
What P0E1D means
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.
P0E1D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P0E1D
- Check engine light on
- Battery or electronics temperatures higher than normal
- Gurgling noise from the coolant loop
- Power or charging rate limited
Common causes of P0E1D
- Most 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
- Less likelyCoolant temperature sensor giving an implausible value
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 P0E1D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1D | The exact fault in that area. |
What to do next
- Note P0E1D 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 P0E1D
What does P0E1D mean?
P0E1D means "Hybrid/EV Battery Pack Coolant Pump B Control Performance". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0E1D?
Drive gently and only to a workshop. With P0E1D the car can go into limp mode (reduced power) to protect itself.
Will P0E1D fail an emissions test?
Yes, it can. P0E1D 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 P0E1D to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P0E1D clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.