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P0744 2002 Nissan Altima Sedan Code - Torque Converter Clutch Circuit Intermittent

Quick Answer

The P0744 diagnostic trouble code (DTC) specifically pertains to the Torque Converter Clutch (TCC) circuit in a 2002 Nissan Altima Sedan. Common causes include Faulty TCC solenoid, Damaged wiring or connectors in the TCC circuit, Malfunctioning TCC clutch. 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 2002 Nissan Altima Sedan indicates Torque Converter Clutch Circuit Intermittent.
Common causes
Common causes include Faulty TCC solenoid, Damaged wiring or connectors in the TCC circuit, Malfunctioning TCC clutch.
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 14, 2024
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Code P0744 2002 Nissan Altima Sedan Description

The P0744 diagnostic trouble code (DTC) specifically pertains to the Torque Converter Clutch (TCC) circuit in a 2002 Nissan Altima Sedan. The TCC is a critical component of the automatic transmission system that helps improve fuel efficiency and reduce engine load by locking the torque converter when the vehicle reaches a certain speed. The TCC circuit intermittent fault indicated by this code means that there is a problem with the electrical connection or signal transmission related to the TCC, leading to intermittent issues with engaging or disengaging the clutch.

OBDII Code P0744 2002 Nissan Altima Sedan - Torque Converter Clutch Circuit Intermittent
P0744 2002 Nissan Altima Sedan Code - Torque Converter Clutch Circuit Intermittent

Common Causes of P0744 2002 Nissan Altima Sedan

  1. Faulty TCC solenoid.
  2. Damaged wiring or connectors in the TCC circuit.
  3. Malfunctioning TCC clutch.
  4. Issues with the transmission control module (TCM).
  5. Low transmission fluid level or contaminated fluid.

Symptoms of P0744 2002 Nissan Altima Sedan

  1. Check Engine Light illuminated on the dashboard.
  2. Harsh shifting between gears.
  3. Reduced fuel efficiency.
  4. Stalling at idle.
  5. Transmission slippage.

How to Fix P0744 2002 Nissan Altima Sedan

  1. Begin by conducting a thorough diagnostic scan to retrieve the specific trouble code and identify the underlying cause of the TCC circuit intermittent fault.
  2. Inspect the TCC solenoid, wiring, and connectors for any signs of damage or corrosion. Replace any faulty components as needed.
  3. Check the TCC clutch for proper operation and replace it if necessary.
  4. Test the transmission control module (TCM) for proper functionality and reprogram or replace it if deemed faulty.
  5. Finally, clear the trouble code from the vehicle's computer system and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P0744 2002 Nissan Altima Sedan

The typical repair costs for addressing a P0744 code in a 2002 Nissan Altima Sedan can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair costs for this type of problem can range from $200 to $600, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary significantly, so it's advisable to obtain quotes from multiple shops to ensure a fair price. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

What does this mean?

Tech Notes for P0744 2002 Nissan Altima Sedan

When the a transmission solenoid is working intermittent, 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 is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced.

When is the Code Detected?

The P0744 is detected when A/T cannot perform lock-up even if electrical circuit is good.

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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 2002 Nissan Altima Sedan Code

1. What does the OBDII code P0744 mean on a 2002 Nissan Altima Sedan?

P0744 indicates an intermittent issue in the torque converter clutch (TCC) circuit, meaning the transmission is struggling to properly engage or disengage the torque converter clutch.

2. What are the common symptoms of P0744 in a 2002 Nissan Altima?

Common symptoms include erratic shifting, decreased fuel efficiency, transmission overheating, slipping gears, or the vehicle stalling at low speeds.

3. What causes the P0744 code to appear in a 2002 Nissan Altima?

Possible causes include a faulty torque converter clutch solenoid, damaged or corroded wiring, low or dirty transmission fluid, or internal transmission issues.

4. Can driving with a P0744 code damage my 2002 Nissan Altima?

Yes, continuing to drive with this code can cause further transmission damage, reduced performance, and potential overheating issues.

5. How can I fix the P0744 code on my 2002 Nissan Altima?

Repairs may include replacing the torque converter clutch solenoid, repairing or replacing damaged wiring, flushing and refilling the transmission fluid, or addressing internal transmission problems.

6. Is it safe to drive my 2002 Nissan Altima with a P0744 code?

It is not recommended to drive for long periods with this code, as it can worsen transmission issues and lead to costly repairs.

7. How much does it cost to repair a P0744 code on a 2002 Nissan Altima?

Repair costs can vary widely. Solenoid replacement may cost $150–$400, while internal transmission repairs can exceed $1,000 depending on the severity.

8. Can low transmission fluid trigger the P0744 code in a 2002 Nissan Altima?

Yes, low or dirty transmission fluid can cause the torque converter clutch to malfunction, leading to the P0744 code.

9. How do I diagnose the P0744 code on my 2002 Nissan Altima?

A mechanic typically uses a scan tool to confirm the code, inspects the transmission fluid condition, tests the solenoid, and checks for damaged wiring or connectors.

10. Will clearing the P0744 code fix the issue in my 2002 Nissan Altima?

Clearing the code will turn off the check engine light temporarily, but the underlying issue must be addressed to prevent the code from returning.

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