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P0743 Powertrain

Torque Converter Clutch Circuit Electrical

An electrical fault in the torque converter clutch solenoid circuit — open, shorted, or out-of-range driver current. The transmission usually inhibits TCC apply when this code is active.

Affected components

  • Torque converter clutch solenoid
  • Solenoid wiring

Common causes

  • High likelihood: TCC solenoid electrically failed
  • Medium likelihood: Wiring/connector fault

Possible symptoms

  • Check engine or transmission warning light on
  • Harsh, delayed, or missing shifts
  • Possible limp mode (locked in one gear)
  • Slipping or shuddering during gear changes

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • Reduced-power or limp mode may occur

Related codes

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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