4T65EV Transmission

Diagnostic trouble code (DTC) information

Condition




Shift solenoids S2 and S1 operate in tandem to control gear-shifting. The solenoids are controlled by power stages in the transmission control module (TCM). The transmission control module (TCM) opens the power stages to activate the solenoids and sends a voltage through the circuit. Solenoid S2 is activated in 1st and 2nd gears. Diagnostic trouble code (DTC) TCM-0009 is stored if the control module registers that the signal in the solenoid S2 circuit is too low when the solenoid should be activated. Solenoid S2 cannot then be activated.

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

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

Fault symptom[s]
- General orange warning lamp lit.
- Malfunction indicator lamp (MIL) lit.
- Harsh gear shifting.
- No shifting.
- No lock-up function.

Hint: Harsh shifting - due to disabled line pressure solenoid STH control. This results in constant maximum line pressure and leads to harsher shifting and gear engagement.
No shifting -because the transmission control module (TCM) prevents activation of the solenoids. This stops gear-shifting.