Torque Converter Clutch Circuit Stuck On
The P0742 code means the vehicle's onboard diagnostic system has detected: Torque Converter Clutch Circuit Stuck On. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $200 - $1800 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
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Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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Common Symptoms
- Check Engine Light illuminated
- Engine stalls when coming to a stop
- Vehicle bucks or shudders at low speeds
- Harsh engagement when shifting from Park
Probable Causes (Ranked by Likelihood)
- TCC solenoid stuck in the on position Very High
- Valve body TCC apply valve stuck High
- Wiring short keeping TCC solenoid energized Moderate
- TCM commanding TCC on at wrong time Low
Step-by-Step Diagnostic Procedure
-
Monitor TCC status on a scan tool -- if it shows locked at low speeds or at a stop, the TCC is stuck on
-
Check TCC solenoid for internal mechanical failure
-
Inspect the valve body TCC apply valve for sticking
-
Check for wiring shorts keeping the solenoid powered
-
A stuck-on TCC acts like driving a manual car in gear without pressing the clutch
Common Fixes by Vehicle
What techs usually find when diagnosing P0742 on specific vehicles — tap your vehicle for the fix and the exact part:
1996-2013 GM 4L60E/4L65E hard DIY
Torque converter clutch solenoid stuck on causes the engine to stall when coming to a stop, like a manual without the clutch in. The TCC solenoid in the valve body is the common fix, but worn valve body bores can also cause it. Replace the solenoid and consider a valve body sleeve kit if the bore is worn. Fresh fluid and filter while you are in there.
Labor: 2-4 hoursFrequently Asked Questions
Can I drive with code P0742?
Do not drive -- have the vehicle towed. Torque Converter Clutch Circuit Stuck On can cause severe transmission damage if ignored.
What is the most common fix for P0742?
The most common fix is replacing the affected solenoid. In some cases, a transmission fluid flush and solenoid replacement resolves the issue. Internal torque converter or valve body damage requires more extensive repair.
Can I replace the solenoid myself?
On some vehicles, shift solenoids are accessible by removing the transmission pan. On others, the valve body must be removed. This is a moderate to hard DIY job requiring transmission fluid drainage and careful reassembly.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0742 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
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