AutoCodes – Nissan – P0744 2002 Nissan Sentra

P0744 2002 Nissan Sentra 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 2002 Nissan Sentra 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 5,069

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 2002 Nissan Sentra 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 2002 Nissan Sentra - Torque Converter Clutch Circuit Intermittent - AutoCodes.com — P0744 2002 Nissan Sentra Code - Torque Converter Clutch Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0744 2002 Nissan Sentra?

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 2002 Nissan Sentra?

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 2002 Nissan Sentra 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 2002 Nissan Sentra Code

1. What are the common symptoms of OBDII code P0744 in a 2002 Nissan Sentra?

The common symptoms of code P0744 include erratic shifting, transmission slipping, and decreased fuel efficiency.

2. What does the OBDII code P0744 indicate in a 2002 Nissan Sentra?

Code P0744 indicates a problem with the Torque Converter Clutch Circuit Intermittent in the transmission system of the vehicle.

3. What are the possible causes of OBDII code P0744 in a 2002 Nissan Sentra?

The possible causes of code P0744 can include a faulty torque converter clutch solenoid, wiring issues, low transmission fluid level, or a malfunctioning torque converter.

4. How can I diagnose the OBDII code P0744 in my 2002 Nissan Sentra?

Diagnosing code P0744 involves using a scan tool to monitor the transmission system, checking the wiring and connectors for any damage, and inspecting the torque converter clutch solenoid for proper operation.

5. How serious is OBDII code P0744 in a 2002 Nissan Sentra?

Code P0744 should be addressed promptly as it can lead to transmission issues and potential damage if left unresolved. It is recommended to have the vehicle inspected by a professional mechanic.

6. Can I continue driving my 2002 Nissan Sentra with OBDII code P0744?

It is not recommended to continue driving your vehicle with code P0744 as it can cause further damage to the transmission system. It is best to have the issue diagnosed and repaired as soon as possible.

7. How much does it typically cost to repair OBDII code P0744 in a 2002 Nissan Sentra?

The cost of repairing code P0744 can vary depending on the root cause of the issue. It is advisable to get a diagnostic from a qualified mechanic to determine the exact cost of repairs.

8. Are there any DIY repair tips for OBDII code P0744 in a 2002 Nissan Sentra?

While some basic checks like inspecting wiring connections can be done DIY, it is best to leave more complex repairs related to code P0744 to professional mechanics to ensure proper diagnosis and resolution.

9. Can a faulty torque converter cause OBDII code P0744 in a 2002 Nissan Sentra?

Yes, a malfunctioning torque converter can contribute to the occurrence of code P0744 as it is a key component of the torque converter clutch circuit.

10. How long does it typically take to repair OBDII code P0744 in a 2002 Nissan Sentra?

The repair time for code P0744 can vary depending on the exact cause of the issue and the availability of parts. It is advisable to consult with a mechanic for a more accurate estimate of the repair duration.