P0D21
Battery Charger A Output Voltage Too Low
Battery charger A reports a output voltage too low condition. HV charging operation may be impaired.
- 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.
- Load exceeds charger capacityCommon
- Increased internal lossPossible
Parts involved
- Battery Charger A
- Wiring Harness
- Bms
P0D21 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.