P1744 - FAULT CODE - OBD2

P1744 Code failures by brands

P1744 FORD, LINCOLN, MAZDA, MERCURY: TORQUE CONVERTER CLUTCH SYSTEM STUCK IN OFF POSITION

Description of DTC code P1744

A TCC solenoid (Torque Converter Clutch) valve is energized while in D4 by the TCM (Transmission Control Module) in response to signals provided from the vehicle speed and the ECM (Engine Control Module). This controls the operation of the lock-up piston.

When the TCC solenoid valve is activated, the torque converter lock-up clutch is activated accordingly, and a 1 to 1 RPM ratio is created between the transmission input shaft and the torque converter rotational speed. However, the lock-up operation is disabled when the transmission fluid temperature is too low. When the accelerator pedal is depressed (below 2/8) in lockup condition, the engine speed should not have abrupt changes, otherwise, there is no lockup.

DTC P1744 OBDII is set on Ford, Lincoln, Mazda, and Mercury vehicles due to the ECM encountering excessive slipping conditions from the transmission or when the TCC solenoid is not functioning.

Symptoms of fault code P1744

Check Engine light illumination.

Causes of OBD2 P1744

P1744 OBD2 diagnostic code is set for one of the following reasons:

The transmission fluid level may not be sufficient or the transmission fluid could have been contaminated.
The Torque Converter Clutch solenoid wiring may be damaged.
The TCC solenoid may be defective.
The transmission could have internal mechanical damage.

Possible solutions of the DTC code P1744

To solve the P1744 OBDII fault code you should take into account the following:

Consult the Technical Service Bulletins.
Verify that the transmission has the necessary amount of fluid. Likewise, you should check if it does not present inconsistencies due to the presence of elements that contaminate it. If one of these conditions is found, make the necessary corrections.
Inspect the condition of the Torque Converter Clutch solenoid wires and connectors. If common damage is discovered, make the appropriate repairs or replacements.
Check the condition of the TCC Take a reading of the resistance of the TCC solenoid and check if this result coincides with the one indicated by the manufacturer in its specifications. If you get a value different from the specified value, replace the solenoid.