Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information TCM-0027

Condition




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 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.