What this code means

Loss of communication between the transfer case module and other vehicle systems.

Symptoms

• 4WD light flashing
• Service 4WD warning
• Cannot select drive modes
• Transmission may default to limp mode

Common causes

• CAN bus wiring fault to module
• Module connector disconnected
• Module power loss
• CAN bus termination issue

Diagnostic steps

1. Check CAN wiring to transfer case module
2. Inspect module connector
3. Verify power and ground at module
4. Look for U-codes related to transfer case
5. Check CAN bus resistance

Repair notes

Repair CAN wiring or connector. Replace module if communication chip failed.

Other Chassis codes on this vehicle