C0374
4WD Drive Coupling
The 4WD or AWD control module has detected a fault on the electronic drive coupling that distributes torque between axles. Reduced torque transfer or a complete loss of all-wheel drive function may result.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: hard
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
Ordered by how often each turns out to be the cause.
- Coupling actuator failedCommon
- Coupling oil overheatedPossible
- Wiring or connector faultLess likely
Parts involved
- Awd Coupling
- Awd Control Module
- Coupling Actuator
C0374 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.