Diagnostic Trouble Code (DTC) Information CEM-De6E

Condition 

Fig 1: Identifying Transmission Control Module (TCM)

Courtesy of VOLVO CARS CORPORATION

The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers that communication with the transmission control module (TCM) is not operating.

The diagnostic trouble code (DTC) can be diagnosed when the ignition has been on for at least 10 seconds.

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 low 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 low speed network, this indicates a common fault in the Control area network. 

Fault symptom[s] 

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