P2E91
Battery Charger B Internal Power Supply Performance
The internal low-voltage power supply of battery charger B does not maintain the expected output. Internal regulator drift or overload.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Common causes
Ordered by how often each turns out to be the cause.
- Internal regulator driftedCommon
- Internal load increasedPossible
Parts involved
- Battery Charger B Internal Psu
P2E91 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.