Diagnostic Trouble Code (DTC) Information TCM-0091

Condition 

Fig 1: Identifying Shift-Lock

Courtesy of VOLVO CARS CORPORATION

The gear selector module (GSM) is located below the top panel for the gear selector assembly. The gear selector module (GSM) communicates with the transmission control module (TCM) via an internal network, Local Interconnect Network (LIN), for the activation of the gear lock function (shift-lock) for example. The diagnostic trouble code (DTC) is stored if the gear selector module (GSM) registers that the circuit for the shift-lock solenoid is open when the output on the solenoid driver stage is inactive.

The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute Value 

• Gear selector blocked.

Possible Source 

• Contact resistance in the terminals
• Open-circuit in signal cable or ground lead
• Internal fault in the gear selector module (GSM).

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit
• General warning lamp lit
• The gear selector is jammed in position P.