Hybrid/EV Battery System Voltage Unstable
The HV battery system voltage fluctuates beyond the expected window. Loose connection or unstable cell behaviour.
Affected components
- Hv battery
- Bms
Common causes
- High likelihood: Cell imbalance
- Medium likelihood: Sense circuit fault
- Low likelihood: Ground point with elevated resistance
Possible symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.