What it means
The output driver for hybrid/ev battery pack coolant control valve c reports current or junction temperature above its protection threshold.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Battery pack coolant control valve C directs coolant through the hybrid or EV battery cooling system. This code sets when the electronic output driving valve C detects excessive current or a temperature above its protection threshold, which can result from a short or an actuator that draws too much current.
Common causes
Most likely first.
- Valve actuator drawing excessive current
- Control circuit short
- Faulty output driver
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 review valve C command and related cooling system codes to see when the driver fault occurred.
- With the vehicle powered down as specified by the manufacturer, inspect valve C’s connector and wiring for damage, corrosion, shorts, or heat discoloration.
- Check the valve actuator and coolant path for binding or obstruction using the manufacturer’s procedure.
- Measure valve C actuator current during a commanded operation and compare it with the manufacturer’s specification.
- If the actuator and wiring pass their tests, check the control module output for a driver fault according to the manufacturer’s diagnostic procedure.
Common fixes
- Repair damaged or shorted wiring in valve C’s control circuit.
- Clean or repair corroded or loose valve C connector terminals.
- Replace valve C if its actuator binds or draws excessive current in the specified test.
- Repair or replace the control module output only after confirming valve C and its circuit are sound.
Can I keep driving?
Avoid high-power driving and charging if the vehicle limits power or reports a battery cooling fault, since valve C may not route coolant correctly. Stop if an overheating warning appears 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.