AutoCodes – Infiniti – P0744 2005 Infiniti G35

P0744 2005 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 2005 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 5,212

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 2005 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 2005 Infiniti G35 - Torque Converter Clutch Circuit Intermittent - AutoCodes.com — P0744 2005 Infiniti G35 Code - Torque Converter Clutch Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0744 2005 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 2005 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 2005 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 2005 Infiniti G35 Code

What are the common symptoms of OBDII code P0744 on a 2005 Infiniti G35?

Common symptoms of OBDII code P0744 on a 2005 Infiniti G35 include engine stalling at stops, poor fuel economy, difficulty shifting gears, and a noticeable decrease in acceleration.

What are the possible causes of OBDII code P0744 on a 2005 Infiniti G35?

Possible causes of OBDII code P0744 on a 2005 Infiniti G35 may include a faulty torque converter clutch solenoid, a malfunctioning torque converter clutch circuit, low transmission fluid levels, or a wiring issue.

How can I diagnose the cause of OBDII code P0744 on my 2005 Infiniti G35?

To diagnose the cause of OBDII code P0744 on a 2005 Infiniti G35, you may need to perform a thorough inspection of the torque converter clutch solenoid, check the wiring connections for any damage, and ensure the transmission fluid levels are correct.

Can I continue driving my 2005 Infiniti G35 with OBDII code P0744?

It is not recommended to continue driving your 2005 Infiniti G35 with OBDII code P0744, as it can lead to further damage to the transmission system. It is best to have the issue diagnosed and repaired as soon as possible.

How much does it typically cost to repair OBDII code P0744 on a 2005 Infiniti G35?

The cost to repair OBDII code P0744 on a 2005 Infiniti G35 can vary depending on the exact cause of the issue. On average, the repair may cost anywhere from $300 to $800, including parts and labor.

Is it possible to reset OBDII code P0744 on a 2005 Infiniti G35 without repairing the issue?

While it is possible to reset OBDII code P0744 on a 2005 Infiniti G35 using an OBDII scanner, it is not recommended as the underlying issue causing the code will still persist and may worsen over time.

Can low transmission fluid cause OBDII code P0744 on a 2005 Infiniti G35?

Yes, low transmission fluid levels can potentially cause OBDII code P0744 on a 2005 Infiniti G35. It is important to check and maintain proper transmission fluid levels to prevent such issues.

What should I do if I experience intermittent torque converter clutch issues on my 2005 Infiniti G35?

If you experience intermittent torque converter clutch issues on your 2005 Infiniti G35, it is advisable to have the vehicle inspected by a qualified mechanic to diagnose and address the underlying problem causing the intermittent behavior.