Hybrid/EV Battery B Voltage Unstable
The voltage measurement of HV battery B fluctuates beyond the expected window. Loose connection or unstable cell.
Affected components
- Hv battery b
- Bms
Common causes
- High likelihood: Loose busbar or terminal connection
- Medium likelihood: Cell with unstable internal resistance
- Low likelihood: Pack cell imbalance approaching service threshold
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
Related codes
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.