This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.
Definition
"Torque Converter Clutch Circuit Intermittent" is the diagnosis trouble code (DTC) P0744. There can be many reasons for your vehicle to exhibit this code and a mechanic must determine which of them have caused it in your case.
Meaning
When an automatic transmission needs a certain amount of torque converter and the amount detected is less than the required amount, the system will store the P0744 code, which indicates a malfunctioning torque converter clutch circuit.
Causes
When the clutch solenoid of the torque converter or the torque converter itself is faulty, the P0744 code may be stored. Others are:
- Fluid blockage within the transmission
- Transmission failure caused by a mechanical component
- Fluid low in transmission
- Torque converter clutch solenoid valve harness has an open or shorted circuit
- The solenoid valve on the torque converter clutch has poor electrical connections
- Fluid in the transmission is dirty
- A defective transmission control module
Symptoms
there may not be any other symptoms. In severe cases, the torque converter clutch could completely fail to disengage. In addition, you might experience:
- Shifts that are too abrupt
- Overheating of the transmission
- Slippage in transmission
- Fuel efficiency decreased
Diagnosis
The mechanic should inspect the condition and levels of transmission fluid after detecting the P0744 code using an OBD-II scanner. A debris blockage in the transmission valve is one of the most common causes of this code. If the fluid has a burnt smell or is too low in pressure, the mechanic should change the dirty transmission fluid.
A clean PCM and a retest should follow the transmission fluid replacement and thorough inspection. Further repairs can be made if the error code returns.
Common mistakes
Misdiagnosis of the torque converter clutch wiring is the most common cause of the P0744 code. Most technicians replace lock up solenoids or torque converters without considering wiring issues.
After each repair attempt, the P0744 code should be cleared and the system should be retested. The Check Engine Light returning after the initial, simple repairs and the stored code reappearing in the PCM can be a sign that there is an intermittent problem that requires a thorough inspection and service.
How serious is this?
In the case of the P0744 code being detected by an OBD-II scanner, the issue is extremely serious. Transmission problems can quickly cause a vehicle to perform less than optimally, and can quickly lead to transmission failure. P0744 should be addressed immediately if it is detected.
What repairs can fix the code?
P0744 codes can be addressed in many ways, including:
- The fluid in the transmission should be checked and replaced; if it is extremely dirty, the system will need to be flushed and the torque converter needs to be replaced.
- Wiring, connectors, and circuitry that are damaged or shorted should be replaced.
- Transmitter harness replacement.
- Locate and repair any transmission fluid leaks.
- Changing a defective pump.
- Repair or replace the solenoid valve harness that controls the torque converter clutch.
- The transmission needs to be rebuilt or replaced.
- In rare cases, the TCM or PCM may need to be repaired or replaced.
- Fuel efficiency decreased
Related codes
None listed.
Conclusion
If your car’s automatic transmission has a problem with the torque converter clutch circuit and you see the P0744 code, don’t hesitate to take your vehicle to a mechanic. The transmission could be in serious danger of failing.
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