Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying Oil Temperature Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

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-0043 is stored if the control module receives too low a signal from the oil temperature sensor for approximately 20 seconds.

Substitute Value 

• No substitute values.

Possible Source 

• Power supply and signal cable short circuited to each other.
• Short-circuit to ground in signal cable.
• Defective oil temperature sensor.

Fault symptom[s] 

• 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.