What it means
4WD/AWD Clutch B Actuator Control Circuit High: the control-circuit voltage is above the expected range. This affects engagement of the all-wheel-drive clutch.
At a glance
- Usually lights the ABS or stability-control warning light
- The engine or gearbox may go into limp mode
How it works
Clutch B's actuator control circuit carries the command that operates the 4WD/AWD clutch. This code sets when the module detects circuit voltage above its expected range, which can happen if the control wire is shorted to battery voltage.
Common causes
Most likely first.
- Wiring shorted to battery
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
Symptoms
- 4WD/AWD may be unavailable
How to diagnose it
- Record freeze-frame data and check clutch B control-circuit readings and related overvoltage or actuator codes.
- Inspect the clutch B harness for pinching or damaged insulation near battery-positive wiring or other powered circuits.
- Check connector pins for corrosion, looseness, or signs that a supply wire is contacting the control terminal.
- Use the wiring diagram to test the clutch B control circuit for a short to battery voltage.
- If the circuit is intact, test the actuator and module output against the manufacturer's specification.
Common fixes
- Repair pinched or damaged clutch B wiring shorted to a power source.
- Correct connector damage or terminal contact between the control and supply circuits.
- Repair a corroded or loose connection identified during circuit testing.
- Replace the actuator or module only if testing confirms an internal fault.
Can I keep driving?
4WD/AWD may be unavailable because clutch B may not respond correctly. Avoid relying on AWD for traction, and stop using it if the vehicle develops binding or unexpected driveline behavior.
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.