What it means
The TCC pressure control solenoid stays in the activated state when commanded off. TCC stays locked which can stall the engine on low-speed stops.
At a glance
- Usually lights the check-engine light
How it works
The torque converter clutch pressure control solenoid controls pressure for converter lockup. P2758 indicates that it remains activated when the controller commands it off, which can keep the converter clutch engaged and may stall the engine as the vehicle slows or stops.
Common causes
Most likely first.
- Solenoid spool stuck in open position
- TCM output driver stuck on
- Carbon or debris buildup preventing free movement
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Save freeze-frame data and review TCC command and converter slip readings, especially around deceleration, to see whether lockup persists after the command switches off.
- Inspect the solenoid connector and harness for a short that could keep the solenoid electrically energized.
- Test whether the controller output remains active when it commands the solenoid off, following the manufacturer's diagnostic procedure.
- If the electrical command is correct, check the solenoid spool for sticking and the valve body for carbon or debris.
- Verify the repair by confirming that converter slip responds to TCC commands during a controlled road test.
Common fixes
- Repair a control wire short that keeps the solenoid energized.
- Clean or repair a sticking solenoid spool if the manufacturer's procedure permits.
- Replace the TCC pressure control solenoid if it remains stuck on.
- Repair the controller output circuit if testing confirms it is stuck on.
Can I keep driving?
Avoid driving in traffic if the engine stalls or nearly stalls as you slow down; this can reduce control of the vehicle. Arrange prompt repair, and stop driving if the engine stalls repeatedly or the transmission shifts unpredictably.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.