TCM-0029

TCM-0029 Second Gear, Incorrect Gear Ratio





Condition
The Transmission Control Module (TCM) calculates the ratio between the transmission input speed and the vehicle speed. There is a specific ratio for each gear. Diagnostic Trouble Code (DTC) TCM-0029 is stored if the control module registers that the ratio deviates by more than 10% when the oil temperature is above +20°C (68°F) and throttle opening exceeds 3%.

Substitute value
- The Transmission Control Module (TCM) "Emergency mode 1" program has been initiated.

Possible source
- Contact resistance in the circuit for solenoids S1, S2, S3, S4, S5 and SLS.
- Solenoid S2 has jammed in the ON position.
- Solenoid S3 has jammed in the OFF position.
- Solenoid S4 has 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 orange warning lamp lit.
- Malfunction Indicator Lamp (MIL) lit.
- No lock-up function.
- Harsh gear shifting.
- No shifting.