P0766 — Shift Solenoid D Performance/Stuck Off

P0766: Shift Solenoid D Performance/Stuck Off — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Shift Solenoid D Performance/Stuck Off. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • Delayed shifts; slipping under load and limited gears.

Possible causes

  • Stuck/faulty solenoid D, contaminated ATF or valve-body wear.

What to check

  • Inspect connections and ATF; request solenoid D operation testing.

Also written as: P0766-00, P076600, PO766 (some scan tools add the fault-type byte, e.g. -00).