P0740 Code - Torque Converter Clutch Malfunction

What does P0740 Mean?

The torque converter clutch 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.

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What are the common causes of P0740 ?

Common causes include a faulty torque converter clutch solenoid, a defective torque converter, hydraulic blockages inside the internal transmission fluid passages, mechanical internal transmission failures, low transmission fluid, dirty or contaminated transmission fluid, a faulty PCM or transmission control module.



How do you troubleshoot P0740 ?

Repairs that can fix the P0740 code may include:

• Replacing the torque converter clutch solenoid
• Replacing the torque converter or clutch
• Adding or replacing transmission fluid and filter
• Replacing the powertrain control module
• Overhauling the current transmission
• Replacing the transmission with a brand new one

Searches related to P0740 - Torque Converter Clutch Malfunction

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