1A6X - 1

Condition







Diagnostic trouble codes (DTCs) are stored if the central electronic module (CEM) registers that communication with the transmission control module (TCM) is not operating.

NOTE: Note the event of CEM-1A6x diagnostic trouble codes (DTCs), the central electronic module (CEM must not be replaced as the diagnostic trouble code (DTC) indicate a communication fault in the Control area
network.

Substitute value

- A substitute gear is engaged.

Possible source

- No power supply to the transmission control module (TCM).
- Open-circuit in the ground lead to the transmission control module (TCM).
- Contact resistance in the terminals.
- Open-circuit in the wiring for the CAN high speed network to the transmission control module (TCM).
- The transmission control module (TCM) is not intended for this car (for example a used control module with different software/hardware).

Hint: If several diagnostic trouble codes (DTCs) are stored in the central electronic module (CEM) for communication faults with other control modules in the high speed network, this indicates a common fault in the Control area network, see the wiring diagram.

Fault symptom[s]

- No shifting.
- Malfunction indicator lamp (MIL) lit.
- Message in the display.