Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying Automatic Transmission Control Module (TCM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Diagnostic trouble code (DTC) TCM-001F is stored if the control module registers that the signal from the speed sensor is missing.

Substitute Value 

• None.

Possible Source 

• Contact resistance in the terminals.
• Open-circuit in the power supply.
• Open-circuit in the signal cable.
• Defective speed sensor.

Fault symptom[s] 

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

HINT: Harsh gear shifting can be caused by: 

• No reduction of the line pressure when shifting.
• No reduction of the line pressure when moving the gear selector between positions P-R, N-R and N-D.
• No request for torque limiting to the engine control module (ECM) when shifting.