Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying Oil Temperature Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The oil temperature sensor transmits a signal to the control module. This signal is used for functions such as temperature controlled lock-up and the engagement of 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 

• The power supply and signal cables are short-circuited to each other
• Short-circuit to ground in the signal cable
• Defective oil temperature sensor.

Fault symptom[s] 

• Warning lamp for the automatic transmission flashes
• Malfunction indicator lamp (MIL) lit
• No lock-up function
• Harsh gear shifting.

HINT: Harsh gear shifting can be caused by: 

• No reduction of the line pressure when shifting
• No reduction of the line pressure when moving the gear selector between positions P-R, N-R and N-D
• No request for torque limiting to the engine control module (ECM) when shifting.