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-0008 is stored if the control module registers an open-circuit in the solenoid S2 circuit when the solenoid is activated.

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

Possible source
- Contact resistance in the terminals.
- Open-circuit in the signal cable.
- Defective solenoid.

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

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.