Chassis
generic / SAE
C0399
4WD Mode Switch Circuit Malfunction
The transfer case or 4WD control module has detected an invalid signal from the driver-operated 4WD mode selector. Mode requests from the dashboard may be ignored.
SystemChassis
Typegeneric / SAE
GroupC0
Range / number3 / 99
Possible causes
- Mode selector switch failed high
- Wiring or connector fault medium
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 60–300 €
- Estimated time: 0.3–1.5 h
- Component: mode selector switch
- Component: transfer case module
- Component: switch wiring
Sources
References
sae:J2012