Diagnostic Trouble Code (DTC) Information TCM-001F: Notes

Condition

Fig 1: Identifying Transmission Output Speed Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

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 at speeds above approximately 70 km/h and when the transmission fluid is above 20 °C.

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 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.