Hybrid/EV Battery Cooling System B Performance
The hybrid battery cooling system B does not maintain target temperatures under load. Coolant flow, radiator fouling, or pump output reduced on this branch.
Affected components
- Hybrid battery cooling system b
- Battery pack coolant loop
Common causes
- High likelihood: Radiator fins fouled - reduced heat rejection
- Medium likelihood: Pump output degraded with age
- 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.