Hybrid/EV Battery Pack Voltage Variation
The BMS detects excessive variation between cell-group voltages within the HV battery pack. Cell imbalance beyond compensation.
Affected components
- Hv battery pack
- Bms
Common causes
- High likelihood: Cell capacity imbalance
- Medium likelihood: Cell balancing function failed
- 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
- A drive cycle may be required after repair
- 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.