P0766
Shift Solenoid D Performance/Stuck Off
Transmission
Generic OBD-II
Medium
What it means
P0766 means shift solenoid D isn't performing as commanded or is stuck in the off position, so its hydraulic circuit won't apply and the transmission can't select the gears that solenoid controls. Expect delayed or harsh shifts, slipping, or limp mode — commonly from blocked fluid passages, dirty fluid, or a failed solenoid.
Medium
Can I keep driving? Often drivable in limp mode with limited gears; get it fixed promptly to avoid further transmission damage.
Common symptoms
What you'll notice
- Delayed or harsh shifting
- Transmission slipping
- Stuck in a limited gear range (limp mode)
- Reduced acceleration
- Check-engine or transmission warning light on
Common causes
Most likely first
- Shift solenoid D failed or stuck in the off positionLikely
- Blocked or dirty transmission fluid passagesCommon
- Low or contaminated transmission fluidCommon
- Wiring or connector fault in the solenoid circuitLess often
- Transmission control module fault (less common)Less often
How to diagnose & fix
Work through it in order
- Check transmission fluid level and condition, and service it if dirty.
- Read freeze-frame data and note any companion codes.
- Inspect the solenoid wiring and connector for damage or corrosion.
- Test and, if needed, replace shift solenoid D in the valve body.
- Flush or clean the valve body to clear obstructions; treat the TCM as a last resort.
FAQ
Quick answers
Is it safe to drive with P0766?+
The car usually still moves but may be locked in limp mode. Short trips are fine; avoid extended driving to protect the transmission.
Can I just clear P0766?+
It returns once the solenoid fails to apply again. Repair the fluid path, wiring, or solenoid to keep it cleared.
Related codes
Often seen with P0766
Read & clear P0766 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX