P0743 – Torque Converter Clutch Solenoid Circuit

Description

The ECM detects a malfunction in the TCC solenoid circuit.

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Symptoms

  • Harsh shifting
  • Limp mode
  • Poor fuel economy

Causes

  • Faulty solenoid
  • Wiring issues
  • ECM fault

Diagnosis

  • Monitor solenoid command
  • Inspect wiring
  • Check resistance

Repair

  • Replace solenoid
  • Repair wiring