Diagnostic Trouble Code (DTC) Information TCM-019C

Condition 

Fig 1: Identifying Top Panel Assembly

Courtesy of VOLVO CARS CORPORATION

The gear selector module (GSM) communicates with the transmission control module (TCM) via an internal network, Local Interconnect Network (LIN).

The diagnostic trouble code (DTC) is stored if the transmission control module (TCM) registers that the voltage level to the gear selector module (GSM) is high despite the power supply having been switched off.

The diagnostic trouble code (DTC) can be diagnosed with the ignition on and with the gear selector module (GSM) without power.

Substitute Value 

• None.

Possible Source 

• Open-circuit in the cable for the power supply to the gear selector module (GSM)
• Contact resistance in the connector
• Internal fault in the gear selector module (GSM).

Fault symptom[s] 

• General warning lamp lit.