P0C30
Hybrid/EV Battery Pack State of Charge High
The BMS detects that the HV battery pack state of charge exceeds the safe upper limit. Regenerative braking may be limited to prevent overcharge.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Common causes
Ordered by how often each turns out to be the cause.
- SoC estimation drifted highCommon
- Regen braking strategy off-targetPossible
- Pack cell imbalance approaching service thresholdLess likely
Parts involved
- Hv Battery Pack
- Bms
P0C30 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.