Jeep, Ram Warning Message
“Service 4WD System”
The 4WD or AWD system has detected a fault. The transfer case, front axle, or electronic shift mechanism may not be functioning correctly.
moderate severity
Common Causes
- Transfer case shift motor failure
- Front axle disconnect actuator fault
- Transfer case fluid degradation
- FDCM (Final Drive Control Module) fault
- Vacuum line leak (older models)
Immediate Action
The vehicle may default to 2WD. Safe to drive on paved roads. Avoid off-road or severe weather conditions until repaired.
Typical Repair Cost
$300–$2,500