Hybrid/EV Battery Precharge Contactor Control Circuit B Open
The control circuit B for the hybrid battery precharge contactor reports a open condition. Pre-charging the DC link before main contactor closure cannot be commanded reliably.
Affected components
- Hybrid precharge contactor b
- Wiring harness
- Bms
Common causes
- High likelihood: Open in coil control wire
- Medium likelihood: Open contactor coil
- 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
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.