Diagnostic Trouble Code (DTC) Information TCM-0027

WARNING: This page is about a different variant/trim than selected.

Condition

Fig 1: Identifying Transmission Control Module

Courtesy of VOLVO CARS CORPORATION

The transmission control module (TCM) receives a signal about input and output speed from the transmission rpm and speed sensor. There is a specific ratio for each gear, and using the signals the control module calculates the transmission gear ratio. The diagnostic trouble code (DTC) is stored if the transmission control module (TCM) registers that the ratio deviates by more than 20%.

The diagnostic trouble code (DTC) can be diagnosed when reversing (gear position "R"), with engine speed (RPM) above 500 rpm and when the temperature of the transmission fluid is above +20 °C.

Substitute Value

Emergency program Emergency mode 1 in the transmission control module (TCM) has been initiated.
HINT: EMERGENCY MODE IN THE EVENT OF A FAULT

Possible Source

Solenoid S1 or S4 jammed in the ON position
Mechanical fault in the transmission. Worn components in the transmission causing slippage or too low line pressure.

Fault symptom[s]

General warning lamp lit
Malfunction indicator lamp (MIL) lit
Abnormal slipping gear shifting
Harsh gear shifting
No shifting.