Diagnostic trouble code (DTC) information

Condition 

Fig 1: Gear-Shift Position Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The gear-shift position sensor signals provide the transmission control module (TCM) with data on the gear selector position. This is done by grounding a combination of signals A, B, C and PA inside the gear position sensor. Diagnostic trouble code (DTC) TCM-0039 is stored if the control module registers an unacceptable combination of A, B, C and PA for a period of approximately 10 seconds as shown below (depending on the transmission).

• = 0-2 V below battery voltage

o = ground

Substitute Value 

• The control module "Limp Home" program has been initiated.

Possible Source 

• Contact resistance in the terminals.
• Short-circuit to supply voltage or ground in the signal cable.
• Open-circuit in the signal cable.
• Incorrectly adjusted gear-shift position sensor.
• Defective gear-shift position sensor.

Fault symptom[s] 

• General orange warning lamp lit.
• Malfunction indicator lamp (MIL) lit.
• No lock-up function.
• Harsh gear shifting.
• No shifting.

HINT: Harsh shifting - due to disabled line pressure solenoid STH control. This results in constant maximum line pressure and leads to harsher shifting and gear engagement. 

HINT: No shifting-because the transmission control module (TCM) prevents activation of the solenoids. This stops gear-shifting.