Differential lock transfer box.
â–¶ How to fix
Check sensors, connectors and wiring. Check the mechanical parts of the differential lock.Check the tachograph configuration.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The front axle speed and the vehicle speed are not the same despite the solenoid valve for the differential lock being active and the position sensor confirming that the differential lock in the transfer gearbox is engaged.
Possible cause
Mechanical defect in differential lock, short circuit in sensor or wiring for sensor. Sensors may have been mixed up.The tachograph may have wrong configuration.