Torque Converter Clutch Circuit Intermittent
The P0744 code means the vehicle's onboard diagnostic system has detected: Torque Converter Clutch Circuit Intermittent. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $150 - $800 (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.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Check Engine Light illuminated intermittently
- Occasional shudder at highway speeds
- TCC engagement feels inconsistent
- Fuel economy varies
Probable Causes (Ranked by Likelihood)
- Loose TCC solenoid connector Very High
- Intermittent break in TCC wiring High
- TCC solenoid with intermittent internal fault Moderate
- Worn TCC friction material causing slip Low
Step-by-Step Diagnostic Procedure
-
Monitor TCC status during highway driving for intermittent drops
-
Wiggle the transmission connector while monitoring TCC solenoid command
-
Inspect transmission connector for loose pins or corrosion
-
Check TCC solenoid resistance multiple times for consistency
-
Replace the solenoid or repair wiring as needed
Common Fixes by Vehicle
What techs usually find when diagnosing P0744 on specific vehicles — tap your vehicle for the fix and the exact part:
2001-2014 Honda Accord/Odyssey Automatic Easy (fluid), Advanced (solenoid) DIY
Intermittent TCC operation on Honda automatics is one of the most common transmission complaints. The TCC solenoid sticks intermittently due to varnish buildup from old ATF. Perform 3x drain-and-fill with Honda DW-1 ATF, driving 100+ miles between each change. This often resolves intermittent TCC codes. If it persists, the TCC solenoid (28250-P6H-024) needs replacement -- accessible through the valve body.
Labor: 30 min per drain/fill, 3-4 hours (solenoid)2003-2016 Nissan Altima/Maxima CVT Easy (fluid), Advanced (converter) DIY
Nissan CVTs don't have a traditional torque converter clutch, but the lockup function can become intermittent. This is usually caused by worn CVT fluid or a failing torque converter lockup solenoid inside the valve body. Change CVT fluid with Nissan NS-3 only -- aftermarket CVT fluid causes premature failure. If the converter itself is shuddering, replacement is required.
Labor: 30-45 min (fluid), 6-8 hours (converter)2005-2017 Ford F-150/Explorer 6R80 Easy (fluid), Advanced (valve body) DIY
TCC intermittent codes on the 6R80 are commonly caused by a worn TCC control solenoid or debris in the valve body TCC regulator valve bore. Check Mercon LV fluid condition -- contaminated fluid accelerates valve bore wear. A valve body rebuild kit with updated TCC regulator valve and sleeve (Sonnax 76948-13K) fixes the root cause. Also inspect the torque converter for clutch material in the fluid.
Labor: 30 min (fluid), 5-7 hours (valve body)Frequently Asked Questions
Can I drive with code P0744?
Drive short distances only. Torque Converter Clutch Circuit Intermittent can cause severe transmission damage if ignored.
What is the most common fix for P0744?
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.
See All Codes & Fixes for Your Vehicle
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.