Diagnostic Trouble Code (DTC) Information TCM-0039

Condition 

Fig 1: Identifying Transmission Control Module (TCM)

Courtesy of VOLVO CARS CORPORATION

The gear position sensor is integrated in the transmission control module (TCM) and provides information about the selected gear position. Inside the transmission control module (TCM) are two hall sensors. Their task is to detect whether the gear selector is in position. For diagnostics there is a parallel hall sensor (2) that provides a reversed signal characteristic, so that the sum of the signal voltages from hall sensors (1) and (2) is constant. The signal voltage (0 and 5 volts) corresponds to the relevant gear selector lever position. The diagnostic trouble code (DTC) is stored if the transmission control module (TCM) registers a faulty signal.

Substitute Value 

• Emergency program Emergency mode 4 in the transmission control module (TCM) has been initiated.

  HINT:  EMERGENCY MODE IN THE EVENT OF A FAULT 

Possible Source 

• Incorrectly adjusted gear-shift position sensor
• Internal fault in the transmission control module (TCM).

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit
• General warning lamp lit
• The engine does not start.