C0520
AWD Coupling Control Circuit
2006-2011 BMW 328i 3.0L I6
High SeverityChassisGeneric (SAE)
Description
Malfunction in the electronically controlled AWD coupling that distributes torque between axles.
Symptoms
- AWD warning light
- Reduced traction in AWD mode
- Vehicle operates in 2WD only
- Burning smell from coupling area
Common Causes
- Electromagnetic coupling failure
- Coupling overheated
- Wiring damage to coupling
- Control module driver failure
Diagnostic Steps
- Test coupling solenoid resistance
- Command coupling engagement with scan tool
- Check for overheating signs
- Inspect wiring and connector
- Monitor coupling temperature if sensor equipped
Repair Notes
Replace AWD coupling unit. Check fluid level in coupling if applicable.
Related Codes
Other Chassis Codes
- C0021LF Wheel Speed Sensor Range/Performance
- C0022RF Wheel Speed Sensor Range/Performance
- C0023LR Wheel Speed Sensor Range/Performance
- C0024RR Wheel Speed Sensor Range/Performance
- C0025LF Wheel Speed Sensor Circuit Intermittent
- C0026RF Wheel Speed Sensor Circuit Intermittent
- C0027LR Wheel Speed Sensor Circuit Intermittent
- C0028RR Wheel Speed Sensor Circuit Intermittent
- C0035Left Front Wheel Speed Sensor Circuit
- C0036Left Front Wheel Speed Signal Erratic
C0520 on Other Vehicles
Common Questions
What does code C0520 mean on a 2006-2011 BMW 328i?
C0520 stands for "AWD Coupling Control Circuit". Malfunction in the electronically controlled AWD coupling that distributes torque between axles.
What are the symptoms of C0520 on a BMW 328i?
Common symptoms of C0520 include: AWD warning light, Reduced traction in AWD mode, Vehicle operates in 2WD only, Burning smell from coupling area.
What causes C0520 on a 2006-2011 BMW 328i?
Common causes of C0520 include: Electromagnetic coupling failure, Coupling overheated, Wiring damage to coupling, Control module driver failure.