P0766 Code - Shift Solenoid 'D' Performance or Stuck Off

What does P0766 Mean?

The PCM has detected an abnormality in shift solenoid D. The computer controlled automatic transmission uses shift solenoids to manage the transfer of fluid between hydraulic circuits and actuate a change in transmission gear ratio. Varying gear ratios are needed to increase and decrease vehicle speed, maximize engine performance, and optimize fuel efficiency.

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What are the common causes of P0766 ?

The most likely causes include:

• Faulty shift solenoid
• Blocked transmission fluid passages
• Internal failures in the transmission
• Low, dirty, or contaminated transmission fluid
• Open or short shift solenoid D valve harness
• Poor electrical connection within the solenoid D circuit
• A faulty PCM or TCM, in very rare cases

How do you troubleshoot P0766 ?

The valves of each cylinder are kept closed using a pair of arms that replace the conventional engine's roller-type rocker arm. P0766 code one of these arms follows the cam profile while the second arm connects to the valves. During normal engine operation the two arms are joined by a locking pin.

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