4T65EV Transmission

Diagnostic trouble code (DTC) information

Condition




Shift solenoids S2 and S1 operate in tandem to control gear-shifting. Solenoid S1 is activated in 1st and 4th gears. Diagnostic trouble code (DTC) TCM-0003 is stored if the control module registers that the signal in the solenoid S1 circuit is too low when the solenoid should be activated. Solenoid S1 cannot then be activated.

Substitute value
- The control module "Limp Home" program has been initiated.

Possible source
- Short-circuit to ground in the signal cable.
- Defective solenoid.

Fault symptom[s]
- The automatic transmission warning lamp flashes.
- No lock-up function.
- Harsh gear shifting.
- No shifting.

Hint: Harsh shifting because there is no line pressure solenoid STH control. This results in constant maximum line pressure.
No shifting -because the transmission control module (TCM) prevents activation of the solenoids. This stops gear-shifting.