P0742: How to Diagnose & Fix — Torque Converter Clutch Circuit Stuck On
52 vehicles · 16 makes · $80-$8,000 repair
How to diagnose and fix P0742: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
RAM 3500 · 2007–2018
The 2007-2018 RAM 3500 with the 68RFE 6-speed automatic transmission suffers from premature failure when towing heavy loads (over 10,000 lbs). The 68RFE is a derivative of the older 545RFE and was not adequately engineered for the torque output of the 6.7L Cummins. The overdrive clutch pack, solenoid pack, and torque converter are the primary failure points. Overheating during sustained towing destroys the clutch packs and warps the valve body. Many trucks experience complete transmission failure between 80,000-150,000 miles if used for regular towing. Rebuild cost: $3,000-5,000. Built/upgraded transmission: $5,000-8,000.
Common Symptoms
- Transmission slipping under heavy load
- Flare between 3rd and 4th gear
- No 3rd gear or no overdrive
- Transmission overheating warning while towing
- Harsh or delayed shifts
- Check engine light with transmission codes
- Complete loss of forward or reverse gears
How to Fix
For minor issues: Complete fluid and filter change with Mopar ATF+4 (68218057AA) and solenoid pack replacement ($400-800). For overheating prevention: Install an auxiliary transmission cooler and keep temps under 220F. For rebuilds: Use a reputable heavy-duty builder (SunCoast, Randys Worldwide, BD Diesel). A properly built 68RFE with billet shafts, upgraded clutch packs, and triple-disc torque converter ($5,000-8,000) will handle 800+ lb-ft of torque. For 2019+ trucks, the Aisin AS69RC replaced the 68RFE.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Geno's Garage QSK2004 68RFE service kit
Verify transmission, pan and required fluid quantity.
- Genuine Mopar ATF+4 68218058AC
68RFE only; verify transmission and service versus overhaul fill quantity.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (3)
Jeep Cherokee · 2014–2019
The ZF 948TE 9-speed automatic transmission exhibits harsh shifting, delayed engagement, and unexpected shifting into neutral. Early models (2014-2015) experienced the most severe issues. The transmission can unexpectedly shift into neutral while driving, creating a crash risk.
Common Symptoms
- Lunging forward after downshift
- Hanging in 2nd gear before aggressive shift
- Failure to downshift when accelerating
- Erratic upshifts and downshifts
- Transmission suddenly shifts into neutral while driving
How to Fix
Multiple TSB software updates available (TSB 21-013-16, 18-018-17, 21-008-17). For severe cases, transmission replacement or reprogramming required. Always ensure latest software updates installed. Regular transmission fluid services every 60,000 miles recommended.
Owner tips & cautions
- WarningAvoid 2014-2015 model years; 2016+ have significant improvements
- TipRegular transmission fluid services every 60,000 miles (not "lifetime")
Sources for this issue (5)
- JeepProblems: Hard, Strange Shifts and Sudden Shutdowns with the ZF 9-Speed Transmissionmedia
- Transmission Repair Cost Guide: ZF 9HP48 Problems & Specsmedia
- Allpar Forums: What is the truth about the ZF 9 speed?forum
- Jeep Cherokee Club: Transmission delayed/rough shifting SOLVED?forum
- Cherish Your Car: Jeep Cherokee Transmission Problems: 9-Speed Failuresmedia
Chevrolet Silverado 1500 · 2015–2023
Both the 8-speed and 10-speed automatic transmissions can develop a shudder during light acceleration. This torque converter clutch issue is widespread across GM trucks. Multiple TSBs have been issued addressing this concern.
Common Symptoms
- Shudder during light acceleration
- Vibration at 25-50 mph
- Harsh shifts
- Hesitation when accelerating
- Shudder goes away under heavy throttle
How to Fix
Perform the GM fluid exchange to Mobil 1 Synthetic LV ATF HP per bulletin 18-NA-355 (no additives; mixing other fluids or additive packages reduces effectiveness). The bulletin repair is covered under the powertrain warranty when within coverage. Multiple fluid changes may be needed. Torque converter replacement in severe cases.
Sources for this issue (1)
RAM 1500 · 2013–2023
RAM 3500 · 2013–2025
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P0742 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0742 mean?
P0742 stands for "Torque Converter Clutch Circuit Stuck On." P0742 means the torque converter clutch (TCC) circuit is stuck on, meaning the lockup clutch that mechanically links the engine to the transmission stays engaged when it should release. The computer commands the clutch on and off, and when it detects the converter clutch remaining applied, it sets this code. The classic symptom is the engine stalling when coming to a stop, similar to driving a manual without pushing the clutch in, along with possible harsh shifts or poor fuel economy. It points to a hydraulic or solenoid problem inside the transmission rather than the engine.
What are the most common causes of P0742?
The most common causes of P0742 are: Stuck or failed torque converter clutch solenoid, Stuck valve in the valve body (TCC apply valve), Contaminated or degraded transmission fluid, Internal transmission hydraulic leak holding the clutch on, Wiring or connector fault to the TCC solenoid, Faulty torque converter, Dirty or clogged transmission filter. The specific cause varies by vehicle.
How much does it cost to fix P0742?
Repair costs for P0742 range from $80 to $8,000, depending on the vehicle and root cause.
Which vehicles are affected by P0742?
Au7o has documented P0742 across 52 vehicle models from 16 manufacturers: Cadillac, Chevrolet, Chrysler, Dodge, Ford, GMC, Honda, Hyundai, Jeep, Kia, Mazda, Nissan, Pontiac, RAM, Toyota, Volvo.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.