P0AC0
Hybrid Battery Cooling System Performance
The BMS detects insufficient cooling performance for the HV battery, where pack temperature rise during operation exceeds expected value despite active cooling.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: shop_only
Common causes
Ordered by how often each turns out to be the cause.
- Coolant pump failedCommon
- Battery radiator cloggedPossible
Parts involved
- Battery Cooling System
- Electric Coolant Pump
- Battery Cooling Fan
P0AC0 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.