What are the common causes of P0766?

Shift solenoid D stuck closed. Debris blocking the solenoid D valve. Low or dirty transmission fluid. A weak solenoid D coil. A worn valve body bore.

Command shift solenoid d on a scan tool and watch the shift. Check the fluid level and condition. Measure the solenoid D resistance. Test the solenoid D circuit for a short. Replace the solenoid if the shift does not respond. Clear the code and retest.

P0766

Shift Solenoid D Performance/Stuck Off

System: Transmission (P code)
Lamp: Check Engine Light
Category: Powertrain - Transmission

What it means

P0766 means Shift Solenoid D Performance/Stuck Off.

Where it lives

For P0766, the description names the solenoid as the part involved.

Check these first

Shift solenoid D stuck closed
Debris blocking the solenoid D valve
Low or dirty transmission fluid
A weak solenoid D coil
A worn valve body bore

What to do next

Command shift solenoid d on a scan tool and watch the shift
Check the fluid level and condition
Measure the solenoid D resistance
Test the solenoid D circuit for a short
Replace the solenoid if the shift does not respond
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.