P0A7A
Hybrid Battery Pack Deterioration
The battery management system detects that the high-voltage battery pack capacity has fallen below acceptable threshold based on charge/discharge tests and impedance measurement.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: shop_only
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.
- Battery aged or damaged cellsCommon
- Persistent cell imbalancePossible
Parts involved
- Hv Battery
- Bms
P0A7A 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.