What it means
4WD/AWD Clutch B Actuator Control Circuit Performance: the control circuit has an electrical fault. 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 operates the 4WD/AWD clutch, and its feedback helps the module judge whether operation is as expected. This code indicates the circuit or its response is outside the expected performance, without identifying a specific low or high voltage condition.
Common causes
Most likely first.
- Actuator motor or position feedback fault
- Open, shorted, or high-resistance actuator wiring
- Loose or corroded connector
- Clutch mechanism binding or excessive wear
- Control module fault
Symptoms
- 4WD/AWD may be unavailable or engage incorrectly
How to diagnose it
- Record freeze-frame data and review live data for clutch B commands, feedback, and related 4WD/AWD codes.
- Inspect clutch B's actuator and feedback connectors for looseness, corrosion, or damaged terminals.
- Follow the wiring for opens, shorts, chafing, and poor connections, including points where the harness moves or rubs.
- Use the wiring diagram to test the actuator circuit under the conditions specified by the manufacturer.
- If electrical checks pass, check for clutch B binding or wear and verify the control module is commanding it correctly.
Common fixes
- Clean and secure a loose or corroded clutch B connector.
- Repair an open, short, or high-resistance section of actuator wiring.
- Replace a confirmed faulty clutch B actuator or position feedback component.
- Repair a binding or worn clutch assembly.
- Replace or reprogram the module only if testing confirms a module fault.
Can I keep driving?
4WD/AWD may be unavailable or may engage incorrectly, so avoid relying on it in conditions that need extra traction. If engagement causes binding or abnormal driveline behavior, stop using AWD and arrange 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.