Diagnostic Trouble Code (DTC) Information

TCM-0044 - Oil Temperature Sensor

Condition







The oil temperature sensor sends a signal to the transmission control module (TCM) which is used for functions such as temperature controlled lock-up and initiating high-temperature programs. The sensor has an NTC (negative temperature coefficient) resistor. The signal (voltage) decreases with increasing oil temperature. Diagnostic trouble code (DTC) TCM-0044 is stored if the control module receives a signal from the oil temperature sensor corresponding to a temperature below approximately -10 degree C (14 degree F) when the engine is started, and the signal has not changed after the engine has been running for approximately 10 seconds.

Substitute Value
- No substitute values.

Possible Source
- Contact resistance in terminals.
- Open-circuit in signal cable or ground lead.
- Short-circuit to supply voltage in the signal cable.
- Defective oil temperature sensor.

Fault Symptom[s]
- General orange warning lamp lit.
- 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.