What it means
The HV battery pack coolant control valve C reports a performance/stuck off condition.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Coolant control valve C directs coolant through the battery-pack thermal management system when commanded. This code sets when the system detects that valve C is not responding as expected or remains in the off position, which can reduce cooling or prevent the intended coolant route.
Common causes
Most likely first.
- Valve stuck closed
- Actuator failed
- Carbon or debris buildup preventing free movement
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
How to diagnose it
- Save freeze-frame data and system codes, then compare valve C's commanded position with its reported response and battery temperature.
- Inspect valve C and its coolant hoses for signs of obstruction, leakage, or damage, and check the connector and wiring for loose or corroded connections.
- Use the manufacturer's active test to command valve C and observe whether it moves or changes the coolant flow as expected.
- Check for restricted coolant flow or debris affecting valve C, following the specified coolant service and safety procedures.
- If the valve is free and wiring is sound, test its actuator and control output to identify the failed component.
Common fixes
- Repair a loose, damaged, or corroded valve C connection or wiring.
- Remove an identified obstruction or debris and restore coolant flow using the manufacturer's procedure.
- Replace valve C if its actuator is stuck or fails the commanded operation test.
- Repair the control module output if testing confirms it is not commanding a functioning valve.
Can I keep driving?
Limit driving and avoid fast charging or heavy power demands if battery temperatures rise or a thermal warning appears; inadequate cooling can force power reduction and harm the pack. Stop if overheating or limp mode occurs and arrange prompt diagnosis.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.