What it means
4WD/AWD Clutch B Actuator Control Circuit Low: the control-circuit voltage is below 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 electrical command that operates the 4WD/AWD clutch. This code sets when the module detects circuit voltage below its expected range, such as from a short to ground or excessive resistance at a connection.
Common causes
Most likely first.
- Wiring shorted to ground
- Connector pins corroded - high contact resistance
- Harness chafing through insulation
Symptoms
- 4WD/AWD may be unavailable
How to diagnose it
- Record freeze-frame data and check clutch B circuit live data and related low-voltage or actuator codes.
- Inspect clutch B's actuator connector and harness for corrosion, chafing, or insulation damage that could expose a wire to ground.
- Check connector pins and grounds for corrosion or poor contact that could add resistance.
- Use the wiring diagram to test the clutch B control circuit for a short to ground and measure voltage under the specified conditions.
- If the wiring tests correctly, test the actuator and module output against the manufacturer's specification.
Common fixes
- Repair harness insulation where clutch B wiring is chafed or shorted to ground.
- Clean or replace corroded clutch B connector terminals.
- Repair a high-resistance ground or circuit connection.
- Replace the actuator or module only if testing confirms its output is faulty.
Can I keep driving?
4WD/AWD may be unavailable because clutch B may not operate. Avoid relying on it for traction in poor conditions, and do not repeatedly command AWD if the system reports a fault.
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.