P0A7F
Hybrid Battery Pack Deterioration
The hybrid battery pack capacity or internal resistance has degraded beyond the diagnostic threshold. Performance and fuel economy fall as the pack ages.
- Check engine light: Yes
- Emissions related: Yes
- 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 pack agedCommon
- Cell imbalance in packPossible
Parts involved
- Hv Battery
- Battery Energy Control Module
P0A7F 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.