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Engine-Codes – Generic – P0744

P0744 Code - Torque Converter Clutch Circuit Intermittent

Quick Answer

The P0744 code indicates a problem with the torque converter clutch circuit, specifically an intermittent issue. Common causes include Faulty torque converter clutch solenoid, Wiring or connector issues in the torque converter clutch circuit, Low transmission fluid levels or dirty fluid. 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 Faulty torque converter clutch solenoid, Wiring or connector issues in the torque converter clutch circuit, Low transmission fluid levels or dirty fluid.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P0744 Description

The P0744 code indicates a problem with the torque converter clutch circuit, specifically an intermittent issue. The torque converter clutch is responsible for creating a direct link between the engine and the transmission, improving fuel efficiency and reducing heat buildup. When this circuit malfunctions intermittently, it can lead to issues with shifting, loss of power, decreased fuel efficiency, and potential damage to the transmission over time.

OBDII Code P0744 - Torque Converter Clutch Circuit Intermittent
P0744 Code - Torque Converter Clutch Circuit Intermittent

Common Causes of P0744

  1. Faulty torque converter clutch solenoid
  2. Wiring or connector issues in the torque converter clutch circuit
  3. Low transmission fluid levels or dirty fluid
  4. Mechanical issues with the torque converter itself
  5. Malfunctioning PCM (Powertrain Control Module)

Symptoms of P0744

  1. Transmission slipping or shuddering
  2. Engine stalling at idle
  3. Decreased fuel efficiency
  4. Check Engine Light illuminated
  5. Harsh shifting between gears

How to Fix P0744

  1. Begin by checking the transmission fluid level and condition, topping off or replacing as needed.
  2. Inspect the torque converter clutch solenoid and circuit for any loose connections or damage, repairing or replacing as necessary.
  3. Test the torque converter for proper function, replacing if found to be faulty.
  4. Clear the diagnostic trouble codes from the vehicle's memory and test drive to ensure the issue has been resolved.
  5. If the problem persists, consult a professional technician for further diagnosis and potential PCM replacement.

Cost to Fix P0744

The repair costs for a P0744 code can vary depending on the specific cause of the issue. On average, the cost can range from $150 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can impact the total cost, so it's best to consult with a professional for an accurate estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for P0744

When a transmission solenoid is working intermittently, in most cases, the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it's recommended to change the transmission fluid and, if possible, remove the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a mechanical transmission failure, and that the transmission will need to be rebuilt or replaced.





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Code P0744 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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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  • Expensive fix???

    Reply to Comment

  • 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.

    Reply to Comment

  • 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

    Reply to Comment

  • 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.

    Reply to Comment

  • It's The CVT transmission if that matters to your diagnosis???

    Reply to Comment

  • No, all the Rogues use CVT

    Reply to Comment

  • Thank you for your diagnosis

    Reply to Comment

  • My light turned on last night how long before it becomes serious

    Reply to Comment

  • 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.

    Reply to Comment

  • 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

    Reply to Comment