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P1740 – Torque Converter Clutch Circuit Fault

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Symptoms

  • Harsh shifting
  • Poor fuel economy

Causes

  • Wiring issue
  • Solenoid failure
  • Connector corrosion

Diagnosis

  • Measure voltage
  • Inspect wiring
  • Test solenoid

Repair

  • Repair wiring
  • Replace solenoid
  • Clean connector
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