Diagnostic Trouble Code (DTC) Information TCM-001E

Condition 

Fig 1: Identifying Vehicle Speed Sensor (VSS)

Courtesy of VOLVO CARS CORPORATION

The transmission speed sensor sends a signal to the transmission control module (TCM) about the engine speed (RPM) at the outgoing drive shaft. Using this signal, the control module calculates the outgoing speed of the transmission. The signal is compared with the signal from the transmission speed sensor and is used to calculate the gear ratio of the transmission and for diagnostics.

The diagnostic trouble code (DTC) is stored if the transmission control module (TCM) registers that the signal from the transmission speed sensor is missing.

The diagnostic trouble code (DTC) can be diagnosed when driving above 20 km/h.

Substitute Value 

• Blocking adaptation
• Blocking lock-up
• Blocking slipping lock-up
• Blocking of neutral check
• If the speed signal from the brake control module (BCM) is missing, the emergency program Emergency mode 1 in the transmission control module (TCM) is initiated
• The transmission control module (TCM) uses the speed signal that the brake control module (BCM) puts out on the control area network (CAN).

HINT:  EMERGENCY MODE IN THE EVENT OF A FAULT 

Possible Source 

• Contact resistance in the terminals
• The transmission speed sensor is loose
• The transmission speed sensor does not function
• Internal fault in the transmission control module (TCM).

Fault symptom[s] 

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