P0E4A code meaning
Hybrid/EV Battery Pack Voltage Sense F Circuit Range/Performance
Powertrain system Generic code P0Exx codes Check engine light
What P0E4A means
P0E4A reports that pack voltage measurement F lies within its electrical range but disagrees with a reference value. No manufacturer documents P0E4A publicly. GM's 2019 hybrid tables show two plausibility checks such a channel could face: P0ABB fails when pack voltage and the summed cell voltages differ by more than 12 V in 20 of 25 samples at 25 ms, and P0AF8 compares the pack sensor with the inverter bus voltage, failing at more than 13.95 V difference in 400 of 500 samples, or at more than 14.95 V against the charger bus. Both are Type A, so the MIL comes on in the first trip. CARB requires rationality monitoring of battery voltage sensors. The electrical faults of channel F are P0E49, P0E4B and P0E4C; channel E uses P0E45.
P0E4A at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0E4A
- MIL on in the first trip with reduced battery power
- Implausible state of charge display
Common causes of P0E4A
- Most likelyContact resistance at a sense terminal distorting the channel F value
- PossibleFault in the comparison value, such as the inverter bus or cell voltage measurement
- Less likelyMeasuring drift or software issue in the battery controller
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery pack voltage sense fWiring harnessBms
What each part of P0E4A means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4A | The exact fault in that area. |
What to do next
- Note P0E4A 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 P0E4A
What does P0E4A mean?
P0E4A means "Hybrid/EV Battery Pack Voltage Sense F Circuit Range/Performance". P0E4A reports that pack voltage measurement F lies within its electrical range but disagrees with a reference value. It is a generic code, so it means the same on every make.
Is it safe to drive with P0E4A?
Drive gently and only to a workshop. With P0E4A the car can go into limp mode (reduced power) to protect itself.
Will P0E4A fail an emissions test?
Yes, it can. P0E4A 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 P0E4A to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0E4A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.