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P1739 – Torque Converter Clutch Stuck On

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Symptoms

  • Stalling
  • Harsh shifting

Causes

  • Solenoid failure
  • Valve body issue
  • ECU fault

Diagnosis

  • Command TCC solenoid
  • Inspect wiring
  • Scan ECU

Repair

  • Replace solenoid
  • Service valve body
  • Update ECU
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