P0766

Shift Solenoid D Performance/Stuck Off

Q: 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.

Q: 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.

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.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P0766 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX