Diagnostic Trouble Code (DTC) Information

TCM-0081 - Vehicle Speed Sensor

Condition







The automatic transmission control module (TCM) receives speed signals from the vehicle speed sensor (VSS) on the transmission. The transmission control module (TCM) uses the signals to select the correct gear. The control module derives and compares the transmission speed with engine speed (RPM) at the transmission. Diagnostic trouble code (DTC) TCM-0081 is stored if the control module registers that transmission vehicle speed signal does not correspond to the transmission speed (RPM).

Substitute Value
- The control module (TCM) "Emergency mode II" program is initiated.

Possible Source
- Power supply for a short-circuit to supply voltage in signal cable.
- Defective vehicle speed sensor (VSS).

Fault Symptom[s]
- General orange warning lamp lit.
- No lock-up function.
- Harsh gear shifting.

HINT: Harsh gear shifting can be caused by:
- No adaptation of the gear slippage times at high altitude (High Altitude Compensation).
- No reduction of line pressure when shifting.
- No reduction of line pressure when moving the gear selector between positions P-R, N-R and N-D.
- No torque limiting request to engine control module (ECM) when shifting.