P0766 OBD II Trouble Code Shift Solenoid D Performance / Stuck Off

How to quickly diagnose, repair, and info on symptoms and causes of a P0766 code that indicates a detected shift solenoid D performance issue or being stuck off.

Symptoms of P0766 OBD II Trouble Code

  • Transmission slipping
  • Transmission overheating
  • Transmission catches in gear
  • Decreased fuel economy
  • Possibly misfire-like symptoms
  • Vehicle enters limp mode
  • Check Engine Light illuminated

Common Causes of P0766 OBD II Trouble Code

  • Insufficient fluid level
  • Dirty or contaminated fluid
  • Dirty or clogged transmission filter
  • Defective transmission valve body
  • Restricted hydraulic passages
  • Transmission has internal failure
  • Faulty shift solenoid
  • Corroded or damaged connector
  • Faulty or damaged wiring
  • Faulty PCM

Severity of P0766 OBD II Trouble Code

The severity of this code normally starts as moderate, but it can progress to a more severe level rapidly when not corrected in a timely manner.