Powertrain
Definition only
Lights the check engine lamp
P2E91: Battery Charger B Internal Power Supply Performance
Standardized SAE J2012 code · P2Exx codes
What does P2E91 mean?
The internal low-voltage power supply of battery charger B does not maintain the expected output. Internal regulator drift or overload.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Common causes
- High Internal regulator drifted
- Medium Internal load increased
Likelihood is a general estimate across vehicles; your make and model may differ.
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P2E91 in the community
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