Engine-Codes - Generic - P0744

P0744 Code - Torque Converter Clutch Circuit Intermittent

- Code Popularity: 60,516 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code P0744?

  • 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 P0744 Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|Code P0744 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.

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|What is the Cost to Diagnose the Code P0744?

Labor: 1.0

The cost to diagnose the P0744 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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|What are Code P0744 Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the P0744 Code Mean?

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.
This Diagnostic Trouble Code (DTC) is detected when the torque converter clutch does not lock-up as instructed by the TCM. This is not only caused by electrical malfunctions (circuits open or shorted), but also by mechanical malfunctions such as control valve sticking, improper solenoid valve operation, etc.

Torque Converter Clutch Circuit Intermittent

|Need more Information on the P0744 Code?

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|Code P0744 Information for Specific Makes

|Need Help with the P0744 Code?

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