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Torque Converter Clutch system electrical failure. Replacing the torque converter lock-up solenoid may solve the problem.
P0743-TORQUE CONVERTER CLUTCH SOLENOID/TRANS RELAY CIRCUITS This code will set if the voltage detected on the Torque Converter Clutch Solenoid Control circuit at the PCM is different than the expected voltage.
Trouble code P0743 means: Torque Converter Clutch Solenoid Circuit Electrical
P0743-TORQUE CONVERTER CLUTCH SOLENOID/TRANS RELAY CIRCUITS
Torque converters cannot be serviced as they are welded together, the only way to fix them is to remove the transmission and torque converter and replace the torque converter.
It could be caused by low transmission fluid level, dirty transmission fluid, a faulty torque converter clutch solenoid valve, or an internal transmission mechanical problem. Try dropping the transmission pan and changing the transmission oil filter and transmission fluid.
code: torque converter CKT Performance Or stuck off
You replace the torque converter.You replace the torque converter.
Code 37 means An open or shorted condition detected in the torque convertor clutch solenoid circuit
you need to replace the torq converter solenoid
The TC Clutch Solenoid Circuitcould be a wiring problem related to the Clutch Solenoidwhich is mounted on the transmission of most every car, even VW's.TheClutch Solenoidcontrols the Torque Converter which is a donut shaped device filled with transmission fluid that the transmission relies on to function properly. The Torque Converter is located inside the Transmission so the Transmission has to be removed to replace it. MAJOR BUCKS.Most of the time an engine code P0740 is given and a do it yourself mechanic should change the transmission fluid and filter, then the Transmission Solenoid. If you also have a Code P0720 you should replace the Output Speed Sensor, maybe both speed sensors because the input will likely go out soon.Speed sensors range in the $20 to $30 each price range and the Transmission Solenoid runs around $300. That's what they cost in my Chrysler Mini van. If that does not fix your problem, you might need wiring harness replaced or the Transmission rebuilt, at least the Torque Converter Replaced.Hope this helps.
The solenoid for the TCC (Torque Converter Clutch) may be bad or shorted. This inside the transmission and if you are lucky inside the easy to get off oil pan. Some require removal of the transmission for repair.