Code P2758 indicates the transmission control module (TCM) has detected that the torque converter clutch (TCC) pressure control solenoid circuit is stuck in an energized state. This means the solenoid is being commanded on when it should be off, or its feedback signal shows it remains activated, preventing proper torque converter lockup and release.
The solenoid itself may be mechanically stuck open or closed, or have an internal electrical short, causing it to remain energized regardless of command.
A short to power in the solenoid control circuit can keep the solenoid energized. Damaged, corroded, or pinched wires between the TCM and solenoid are common.
Dirty, degraded, or incorrect fluid can cause the solenoid to stick or not move freely, leading to a stuck-on condition.
An internal driver circuit failure in the TCM can cause the solenoid to be continuously powered. This is less common and should only be considered after ruling out the solenoid and wiring.
It is not recommended to drive for extended periods. The torque converter may not lock or unlock properly, which can cause stalling, overheating, and potential transmission damage.
No. The most common cause is a faulty TCC solenoid or a wiring issue. Replacing the TCM is rarely the fix and should only be considered after all other diagnostics have been exhausted.
Sometimes. If the fluid is dirty or degraded and causing the solenoid to stick, a fluid and filter change may resolve the issue. However, if the solenoid is electrically faulty, replacement is necessary.
It means the solenoid is being commanded to turn off, but the TCM detects that it remains electrically or mechanically engaged, keeping the torque converter clutch applied when it should be released.