TCM-002C

TCM-002C 5th 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) TCM002C is stored, depending on the gear, 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 OFF position.
- Solenoid S3 has jammed in the ON position.
- Solenoid SLS 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.