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P1520 – Throttle Actuator Control Stuck Closed

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Symptoms

  • Stalling
  • No acceleration
  • Low idle

Causes

  • Carbon buildup
  • Actuator failure
  • Mechanical jam

Diagnosis

  • Inspect throttle body
  • Check actuator movement
  • Scan ECU

Repair

  • Clean throttle body
  • Replace actuator
  • Repair mechanical issue
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