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P0744 2004 Infiniti G35 Code - Torque Converter Clutch Circuit Intermittent

Quick Answer

The P0744 diagnostic trouble code (DTC) indicates a potential issue with the torque converter clutch circuit in a 2004 Infiniti G35. Common causes include Faulty torque converter clutch solenoid, Wiring or electrical connection issues, Low transmission fluid levels or contaminated 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 2004 Infiniti G35 indicates Torque Converter Clutch Circuit Intermittent.
Common causes
Common causes include Faulty torque converter clutch solenoid, Wiring or electrical connection issues, Low transmission fluid levels or contaminated 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 10, 2024
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Code P0744 2004 Infiniti G35 Description

The P0744 diagnostic trouble code (DTC) indicates a potential issue with the torque converter clutch circuit in a 2004 Infiniti G35. The torque converter is a critical component in an automatic transmission system that allows the engine to continue running even when the vehicle is at a complete stop. The torque converter clutch is responsible for locking the torque converter to the engine's crankshaft, improving fuel efficiency and reducing heat buildup in the transmission.

OBDII Code P0744 2004 Infiniti G35 - Torque Converter Clutch Circuit Intermittent
P0744 2004 Infiniti G35 Code - Torque Converter Clutch Circuit Intermittent

Common Causes of P0744 2004 Infiniti G35

  1. Faulty torque converter clutch solenoid
  2. Wiring or electrical connection issues
  3. Low transmission fluid levels or contaminated fluid
  4. Mechanical problems within the torque converter
  5. ECM (Engine Control Module) software or programming issues

Symptoms of P0744 2004 Infiniti G35

  1. Decreased fuel efficiency
  2. Rough or erratic shifting
  3. Engine stalling at idle
  4. Transmission overheating

How to Fix P0744 2004 Infiniti G35

  1. Diagnose the issue using a scan tool to verify the P0744 DTC and perform a thorough inspection of the torque converter clutch circuit.
  2. Check the transmission fluid level and condition, topping off or replacing if necessary.
  3. Inspect the torque converter clutch solenoid and wiring for any signs of damage or corrosion, replacing or repairing as needed.
  4. Test the torque converter operation and perform a road test to verify the repair and ensure proper functionality.
  5. Clear the DTC and reset the ECM to complete the repair process.

Cost to Fix P0744 2004 Infiniti G35

The typical repair costs for addressing a P0744 DTC in a 2004 Infiniti G35 can range from $200 to $600, depending on the specific cause of the issue and the labor rates at the auto repair shop. Additional costs may be incurred if any parts need to be replaced or if further diagnostics are required. It is recommended to consult with a qualified mechanic or repair shop to obtain a more accurate estimate based on the individual circumstances of the vehicle.

What does this mean?

Tech Notes for P0744 2004 Infiniti G35

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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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 2004 Infiniti G35 Code

1. What does the OBDII code P0744 mean on a 2004 Infiniti G35?

P0744 indicates an intermittent issue in the torque converter clutch (TCC) circuit, meaning the transmission is having trouble locking or unlocking the torque converter as needed.

2. What are the common symptoms of code P0744 in a 2004 Infiniti G35?

Common symptoms include transmission slipping, poor fuel economy, shuddering at certain speeds, difficulty shifting gears, and the check engine light being illuminated.

3. What causes the P0744 code in a 2004 Infiniti G35?

Possible causes include a faulty torque converter clutch solenoid, low or dirty transmission fluid, damaged wiring or connectors in the TCC circuit, or internal transmission issues.

4. Can driving with a P0744 code damage my 2004 Infiniti G35?

Yes, prolonged driving with this issue can cause further transmission damage, reduced fuel efficiency, and increased wear on the torque converter.

5. How can I fix the P0744 code on my 2004 Infiniti G35?

Start by checking and replacing the transmission fluid if it’s dirty or low. Inspect the wiring and connectors in the TCC circuit for damage. If the issue persists, the torque converter clutch solenoid or transmission itself may require repair or replacement.

6. How much does it typically cost to fix a P0744 code on a 2004 Infiniti G35?

Repair costs vary but can range from $150 to $400 for a solenoid replacement and up to $2,500 or more if a full transmission rebuild is required.

7. Can dirty or low transmission fluid cause code P0744 in a 2004 Infiniti G35?

Yes, dirty or low transmission fluid can prevent the torque converter clutch from operating properly, leading to the P0744 code.

8. How do I know if the torque converter clutch solenoid is faulty in my 2004 Infiniti G35?

A faulty solenoid may cause irregular shifting, slipping transmission, or a failure to lock the torque converter, which can trigger the P0744 code.

9. Do I need to replace the entire transmission if I get the P0744 code on my 2004 Infiniti G35?

Not necessarily. The issue could be related to the solenoid, fluid, or wiring. However, if the transmission has significant internal damage, replacement or rebuilding may be required.

10. Can a bad torque converter cause the P0744 code on a 2004 Infiniti G35?

Yes, a failing torque converter can cause issues with the TCC circuit, leading to the P0744 code. This may require torque converter replacement.

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