CAN communication timeout from the tachograph.
â–¶ How to fix
Check CAN connections, connectors and wiring. Also check the tachograph.
What you'll see
No driver-visible symptom recorded.
System reaction
If there is also a Time Out from the brake system, it is possible to change gear in the transfer box even though the vehicle is not stationary/almost stationary.
Diagnostic depth
Detection
Any of the CAN messages expected from the tachograph disappears or is missing.
Possible cause
Open circuit on CAN connection to AWD or tachograph control unit. If fault codes 11060, 11080, 11100 and 11110 have been generated, there is probably an open circuit on the CAN cable to the AWD control unit.