AutoCodes – Mercedes-Benz – P0744 Mercedes-Benz

P0744 Mercedes-Benz 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 Faulty torque converter clutch solenoid valve, Torque converter clutch solenoid valve harness is open or shorted, Torque converter clutch solenoid valve circuit poor electrical connection. 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 Mercedes-Benz indicates Torque Converter Clutch Circuit Intermittent.
Common causes: Common causes include Faulty torque converter clutch solenoid valve, Torque converter clutch solenoid valve harness is open or shorted, Torque converter clutch solenoid valve circuit poor electrical connection.
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 3,907

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 Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0744 Mercedes-Benz 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.
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 condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

OBDII Code P0744 Mercedes-Benz - Torque Converter Clutch Circuit Intermittent - AutoCodes.com — P0744 Mercedes-Benz Code - Torque Converter Clutch Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0744 Mercedes-Benz?

Faulty torque converter clutch solenoid valve
Torque converter clutch solenoid valve harness is open or shorted
Torque converter clutch solenoid valve circuit poor electrical connection
Low transmission fluid level
Dirty transmission fluid

How to Fix the DTC P0744 Mercedes-Benz?

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 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0744 Mercedes-Benz 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.

Need more information about the P0744 Mercedes-Benz code?

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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 Mercedes-Benz Code

1. What does the OBDII code P0744 mean in a Mercedes-Benz?

P0744 indicates an intermittent issue in the torque converter clutch circuit, which can affect the transmission's efficiency and performance.

2. What are common symptoms of code P0744 in a Mercedes-Benz?

Symptoms may include slipping transmission, reduced fuel efficiency, harsh shifting, or the Check Engine Light being illuminated.

3. What causes the P0744 code in a Mercedes-Benz?

Common causes include a faulty torque converter clutch solenoid, wiring issues, low or dirty transmission fluid, or a malfunctioning transmission control module (TCM).

4. Can driving with a P0744 code damage my Mercedes-Benz?

Yes, ignoring the issue can lead to increased wear on the transmission and potential damage to internal components over time.

5. How do I diagnose a P0744 code on a Mercedes-Benz?

Diagnosis typically involves checking the transmission fluid condition, inspecting the solenoid and wiring, and using a scan tool to monitor related transmission parameters.

6. What repairs are needed to fix the P0744 code in a Mercedes-Benz?

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

7. Is low transmission fluid a possible cause of the P0744 code?

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

8. How much does it cost to repair a P0744 code in a Mercedes-Benz?

Repair costs vary but can range from $150 to $1,000 depending on whether it's a fluid service, solenoid replacement, or more extensive transmission repair.

9. Can I fix the P0744 code on my Mercedes-Benz myself?

If you're experienced with car repairs, you can start by checking and replacing the transmission fluid or inspecting wiring. However, diagnosing solenoid or TCM issues may require professional tools and expertise.

10. Will clearing the code solve the P0744 issue in my Mercedes-Benz?

Clearing the code may turn off the Check Engine Light temporarily, but the underlying issue must be addressed to prevent it from returning.