P0743 Code - Torque Converter Clutch Circuit Electrical

What does P0743 Mean?

The PCM has detected an abnormality in the torque converter clutch circuit. The computer controlled automatic transmission uses varying degrees of torque converter clutch application (also called torque converter lock up) to maximize engine power and optimize fuel efficiency.

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What are the common causes of P0743 ?

• Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
• Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
• Defective ECU strategies or components will prevent proper regeneration

How do you troubleshoot P0743 ?

The following are some of the most common causes for the P0743 code:

• Faulty torque converter clutch solenoid
• Defective torque converter
• Mechanical internal transmission failure
• Hydraulic blockages inside internal transmission fluid passages
• Low transmission fluid
• Dirty transmission fluid
• A faulty transmission control module or faulty PCM

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