AutoCodes – Infiniti – P0744 2006 Infiniti G35

P0744 2006 Infiniti G35 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 2006 Infiniti G35 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.

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Code Popularity 3,945

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 29, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0744 2006 Infiniti G35 Description

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). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.
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.
The Diagnostic Trouble Code (DTC) P0744 is detected when A/T cannot perform lock-up even if the electrical circuit is good.

OBDII Code P0744 2006 Infiniti G35 - Torque Converter Clutch Circuit Intermittent - AutoCodes.com — P0744 2006 Infiniti G35 Code - Torque Converter Clutch Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0744 2006 Infiniti G35?

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 2006 Infiniti G35?

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.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0744 2006 Infiniti G35 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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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 2006 Infiniti G35 Code

1. What are the common symptoms of OBDII code P0744 in a 2006 Infiniti G35?

The common symptoms of code P0744 in a 2006 Infiniti G35 include engine stalling at stops, decreased fuel efficiency, and difficulty shifting gears.

2. What does the OBDII code P0744 on a 2006 Infiniti G35 indicate?

Code P0744 on a 2006 Infiniti G35 indicates an intermittent issue with the torque converter clutch circuit, affecting the operation of the vehicle's transmission.

3. What are the possible causes of OBDII code P0744 in a 2006 Infiniti G35?

Common causes of code P0744 in a 2006 Infiniti G35 include a faulty torque converter clutch solenoid, damaged wiring or connectors, low transmission fluid levels, or internal transmission issues.

4. How can I diagnose the OBDII code P0744 on my 2006 Infiniti G35?

Diagnosing code P0744 involves using an OBDII scanner to retrieve the code, inspecting the transmission fluid level and condition, checking for damaged wiring or connectors, and testing the torque converter clutch solenoid.

5. Can I continue driving my 2006 Infiniti G35 with OBDII code P0744?

It is not recommended to continue driving your 2006 Infiniti G35 with code P0744, as it can lead to further transmission damage and potential safety issues. It is best to address the underlying problem promptly.

6. How can I repair OBDII code P0744 in my 2006 Infiniti G35?

Repairing code P0744 may involve replacing the torque converter clutch solenoid, repairing damaged wiring or connectors, ensuring proper transmission fluid levels, or addressing any internal transmission issues.

7. Is it possible to reset the OBDII code P0744 in a 2006 Infiniti G35?

While you can clear the code with an OBDII scanner, it is crucial to diagnose and address the root cause of the issue triggering code P0744 to prevent it from reoccurring.

8. Can a DIY enthusiast fix OBDII code P0744 in a 2006 Infiniti G35?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address code P0744 by replacing the torque converter clutch solenoid or checking for damaged wiring. However, complex transmission issues may require professional assistance.

9. How much does it cost to repair OBDII code P0744 in a 2006 Infiniti G35?

The cost of repairing code P0744 in a 2006 Infiniti G35 can vary depending on the underlying issue, parts needed, and labor costs. It is recommended to obtain quotes from reputable repair shops for an accurate estimate.

10. Will OBDII code P0744 cause my 2006 Infiniti G35 to fail an emissions test?

Code P0744 may trigger the check engine light, which could result in a failed emissions test. It is advisable to address the issue causing the code before undergoing an emissions test to ensure compliance.