P0766 – Shift Solenoid D Performance/Stuck Off

Description

The ECM detects shift solenoid D stuck off or performing incorrectly.

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Symptoms

  • Harsh shifting
  • No upshift
  • Limp mode

Causes

  • Faulty solenoid
  • Low fluid
  • Valve body issues

Diagnosis

  • Monitor solenoid data
  • Inspect wiring
  • Check fluid

Repair

  • Replace solenoid
  • Refill fluid
  • Service valve body