What it means
4WD/AWD Clutch B Actuator Control Circuit/Open: the control circuit is open. 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 used to operate the 4WD/AWD clutch. The control module sets this code when it detects an open path in that circuit, which can prevent clutch B from operating.
Common causes
Most likely first.
- Wiring break
- Pin pushed back out of connector body
- Cracked solder joint inside the module or sensor
Symptoms
- 4WD/AWD may be unavailable
How to diagnose it
- Record freeze-frame data and check for related 4WD/AWD actuator or supply-voltage codes.
- Inspect clutch B's actuator connector for a pushed-back pin, loose fit, or damaged terminal.
- Trace clutch B's actuator wiring for a break, chafe, or damage between the actuator and module.
- Use the wiring diagram to test circuit continuity and check for opens at the actuator connector and accessible harness points.
- If the harness and terminals pass, test the actuator and module connections against the manufacturer's specification.
Common fixes
- Reconnect and secure clutch B's actuator connector.
- Repair a broken wire or pushed-back terminal in the clutch B circuit.
- Repair a confirmed cracked solder joint in the affected component.
- Replace the actuator or module only if circuit testing confirms the fault is internal.
Can I keep driving?
4WD/AWD may be unavailable because clutch B may not respond to commands. Avoid relying on the system for traction, especially on slippery or uneven roads.
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.