P2E91 code meaning
Battery Charger B Internal Power Supply Performance
What P2E91 means
P2E91 is the same verdict for charger B: one of its internally generated supply voltages is wrong, so the charger cannot run its power stages safely. Polestar uses the code on the Polestar 3, whose grid-to-high-voltage converter GHCA reports as charger B. Technical journal TJ 37630 (version 3.0, December 2025) lists P2E9117 and P2E9119, by failure-type byte voltage and current above threshold, among the GHCA codes and says to replace the GHCA when DC charging works but AC charging does not. Mercedes shows that the trigger may sit outside the unit: its bulletin for the 22 kW smart charger blames loose low-voltage plugs for P1D0BFD, an internal supply fault. Mitsubishi checks such rails under P0D67. The A-side twin is P2E90, the 12 V feed of charger B P2E2F.
P2E91 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2E91
- AC charging fails while DC fast charging still works
- Charging time much longer or charging stops early
- Charging socket light signals a fault
Common causes of P2E91
- Most likelyInternal supply stage of charger B failed
- PossibleLoose low-voltage connector or weak 12 V feed at charger B
- Less likelyCharger software fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Battery charger b internal psuOn board charger
What each part of P2E91 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 91 | The exact fault in that area. |
What to do next
- Note P2E91 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 P2E91
What does P2E91 mean?
P2E91 means "Battery Charger B Internal Power Supply Performance". P2E91 is the same verdict for charger B: one of its internally generated supply voltages is wrong, so the charger cannot run its power stages safely. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E91?
P2E91 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2E91 fail an emissions test?
P2E91 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P2E91 to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P2E91 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.