U0101

U0101

Diagnosis Information - CAN

Communication, Transmission control unit

NOTE: Internal function test completed.

Diagnostic conditions
The Transmission control unit initially tests internal function sequences after wake-up. If they are OK, all diagnosable outputs are then tested and any faults are stored.

Transmission control unit wake-up through:
- Event-induced CAN message
- "Ignition on"

Possible fault causes
- No power supply for Transmission control unit
- Transmission control unit is incorrectly coded
- Short circuit or open circuit in the CAN drive
- Transmission control unit faulty (in most cases the cause is not the Transmission control unit but incorrect coding.)
- DME control unit faulty

Fault effects
- Communication via the CAN drive is no longer possible
- No other control units are able to communicate with the Transmission control unit