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Diagnose/P0743
P0743Medium SeverityTransmission

Torque Converter Clutch Circuit Electrical

What This Means

An electrical fault has been detected in the TCC solenoid circuit. This prevents proper control of the torque converter lock-up clutch.

Common Symptoms

  • TCC not engaging
  • Fuel economy decrease
  • Slight shudder
  • Check engine light on

Common Causes

  • Faulty TCC solenoid
  • Wiring short or open
  • Connector corrosion
  • PCM driver failure
  • Transmission internal wiring

Estimated Repair Cost

$200 – $1200
Parts and labor (varies by vehicle and location)
Difficulty:Professional

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.