P0744 Code - Torque Converter Clutch Circuit Intermittent
Quick Answer
The Torque Converter Clutch (TCC) solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Torque Converter Clutch (TCC) Solenoid Valve. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0744 indicates Torque Converter Clutch Circuit Intermittent.
- Common causes
- Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Torque Converter Clutch (TCC) Solenoid Valve.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0744 Description
The lock-up operation, however, is prohibited when A/T fluid temperature is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up conditions, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.
This Diagnostic Trouble Code (DTC) is detected when the torque converter clutch does not lock-up as instructed by the TCM. This is not only caused by electrical malfunctions (circuits open or shorted), but also by mechanical malfunctions such as control valve sticking, improper solenoid valve operation, etc.
What are the Possible Causes of the DTC P0744?
- Low transmission fluid level
- Dirty transmission fluid
- Faulty Torque Converter Clutch (TCC) Solenoid Valve
- Torque Converter Clutch Solenoid Valve harness is open or shorted
- Torque Converter Clutch Solenoid Valve circuit poor electrical connection
How to Fix the DTC P0744?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0744 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P0744 Infiniti — Torque Converter Clutch Circuit Intermittent
- P0744 Mazda — Slip Control Malfunction
- P0744 Mercedes-Benz — Torque Converter Clutch Circuit Intermittent
- P0744 Nissan — Torque Converter Clutch Circuit Intermittent
- P0744 Suzuki — Torque Converter Clutch Solenoid Valve Function
Frequently Asked Questions about P0744 Code
1. What are the common symptoms of OBDII code P0744 (Torque Converter Clutch Circuit Intermittent)?
- Common symptoms include engine stalling at idle, poor fuel efficiency, harsh shifting, and the Check Engine light illuminating.
2. What are the possible causes of OBDII code P0744?
- The code P0744 can be triggered by issues such as a faulty torque converter clutch solenoid, damaged wiring in the circuit, low transmission fluid levels, or a failing torque converter.
3. How serious is OBDII code P0744?
- While the vehicle may still be drivable with this code, it is important to address it promptly to prevent further damage to the transmission and ensure optimal performance.
4. Can I still drive my vehicle with OBDII code P0744 present?
- It is generally not recommended to drive with the code present, as it can lead to transmission issues and reduced fuel efficiency. It's best to have the vehicle inspected and repaired.
5. How is OBDII code P0744 diagnosed?
- Diagnosing P0744 typically involves using a scan tool to retrieve the code, checking the transmission fluid level and condition, and performing a thorough inspection of the torque converter clutch circuit.
6. What are some DIY repair tips for OBDII code P0744?
- DIY repair tips may include checking and replacing damaged wiring in the circuit, inspecting and cleaning electrical connections, and ensuring the transmission fluid is at the correct level.
7. Can OBDII code P0744 be reset without fixing the underlying issue?
- While you can clear the code temporarily, it is likely to reappear if the underlying issue causing P0744 is not addressed. It's recommended to diagnose and repair the root cause.
8. How much does it typically cost to repair OBDII code P0744?
- The cost of repairing P0744 can vary depending on the underlying issue, but it may range from a few hundred to a few thousand dollars, especially if parts like the torque converter need to be replaced.
9. Is it safe to continue driving if OBDII code P0744 comes and goes intermittently?
- While intermittent occurrences may not immediately impact drivability, it is still important to have the issue diagnosed and repaired to prevent potential transmission damage in the long run.
10. How long does it usually take to repair OBDII code P0744?
- The repair time for P0744 can vary based on the specific cause of the code and the complexity of the repair. It could range from a few hours to a day or more, depending on the situation.
Discuss the causes and fixes for P0744 OBDII Code
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Depends exactly what the problem is and what model and year is your vehicle, but if you add the diagnosis time, labor and parts, yes it can be expensive to fix.
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2013 nissan rogue rpms go way high when it's hot with no power once it cools down it ok sometimes between1.5 and 2rpm it jumps is my transmission done guys at valvoline said new one is6 to 8 grand
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I would say around $3K-$4K for a new transmission from the dealer.
I recommend having a transmission shop diagnose the problem. Could be just the valve body and that should be less than $2K.
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It's very difficult to say, it depends on how you drive, where you drive, maintenance. You could start by clearing the code, If the code comes back within a day, then you should have your vehicle check by a transmission shop.
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Hello, I have a 2001 maxima
Transmission jatco model RE4F04B
Around 202k miles it got p0744
Shifting very bad.I noticed the fluid very dirty.
So I did a slow ATF flush
Doing 3 drain and fills with few thousand miles between each.
ATF used , valvoline maxlife full synthetic
I also used Lucus transmission fix stop slips on first 2 drain and fills. And seafoam transtune just before the 3rd drain and fill. It helped clean up stuff and you could feel the difference. On last drain and fill I used only transmission fluid and later. Added LUCUS again. (I could feel that it needed it)
Maybe some valve or solenoid is leaking/sticking and “hammering”P0744 still comes up but not as much after LUCUS and seafoam. It also drives and shifts 95% better than when this first started. I was able to get it to pass state emissions test. Barely on Retest . Looks like I have O2 B2S2 starting to go (p0160)
My question is do you think changing the shift solenoids block would resolve the issue p0744
(Nissan part #31940-85X01
or 31940-85X0B)Or should I be concerned that torque converter or entire valve body needs replacement also?
Thanks
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