P0742
Torque Converter Clutch Circuit Stuck On
Transmission
Generic OBD-II
Medium
What it means
P0742 means the transmission's torque converter clutch (TCC) circuit is stuck in the engaged position, so the converter can't unlock when it should. Because the engine stays mechanically tied to the transmission, it can shudder or stall as you slow to a stop — similar to leaving a manual car in gear without pressing the clutch. It usually points to a stuck TCC solenoid, a wiring fault, or dirty fluid.
Medium
Can I keep driving? You can usually drive, but the engine may stall or shudder when you slow to a stop because the converter clutch won't release — get it looked at soon.
Common symptoms
What you'll notice
- Check-engine light on
- Engine shudders, stumbles, or stalls when coming to a stop
- No smooth 'lock-up' feel — RPM stays low or engine bogs at low speed
- Reduced fuel economy
- Transmission runs hotter than normal
Common causes
Most likely first
- Torque converter clutch (TCC) solenoid stuck or shorted onLikely
- Wiring or connector fault holding the TCC circuit energizedCommon
- Low or contaminated transmission fluidCommon
- Sticking valve body / TCC control valveLess often
- Failed transmission control module (TCM)Less often
- Internal torque converter or transmission wearLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check transmission fluid level and condition first.
- Inspect the TCC solenoid connector and wiring for shorts, chafing, or corrosion.
- Test the TCC solenoid resistance and operation; replace if stuck on.
- Check the valve body / TCC control valve for sticking, especially if fluid is dirty.
- If the circuit and solenoid check out, evaluate the TCM and internal converter. Clear and road-test.
FAQ
Quick answers
Is it safe to drive with P0742?+
Short trips are usually fine, but the main risk is stalling when you slow down or stop, which can be unsafe in traffic. Repair it soon and watch for overheating.
Can I just clear P0742?+
It will come back within a drive cycle or two until the stuck TCC circuit is fixed. Clearing only resets the light temporarily.
Related codes
Often seen with P0742
Read & clear P0742 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX