P0742: Torque Converter Clutch Solenoid Circuit Stuck On
P0742 means Torque Converter Clutch Solenoid Circuit Stuck On. The torque converter clutch (TCC) locks the converter at cruising speed to eliminate slip. This code means the clutch appears applied when it should be released, which can stall the engine when stopping.
Can I keep driving? Drivable with care. Diagnose soon: performance, economy or other components can be affected.
Common symptoms
- Check engine light on
- Higher RPM at highway speed and worse fuel economy (stuck off)
- Stalling when coming to a stop (stuck on)
- Shudder at light throttle
Possible causes
- Faulty TCC solenoid
- Wiring or connector fault
- Low or degraded fluid
- Worn torque converter clutch
- Valve body problem
How to diagnose P0742
- Check fluid level and condition.
- Check the solenoid circuit and resistance.
- Command TCC apply on a scan tool and watch slip RPM.
What the code means, digit by digit
Generic codes have the same definition on every OBD-II vehicle (petrol cars from model year 1996 in the US, 2001 in the EU; diesels later). Manufacturers can add their own enhanced codes; those are not listed here.
Symptoms linked to P0742
Related codes
General guidance only. Fault codes describe what the engine computer saw, not which part failed: confirm with testing before replacing parts, and follow the vehicle's service information.