P1766 Shift Solenoid D Performance
What does P1766 mean on a Ford?
P1766 — Shift Solenoid D Performance. This Ford-enhanced code applies to F-150, Explorer with 5-speed automatics.
Common causes of P1766
- Slow shift solenoid D
- Contaminated fluid
- Low line pressure
- Valve body wear
- Wiring fault
How to fix P1766
- Service fluid and filter
- Watch solenoid D timing data
- Test solenoid response
- Verify line pressure
- Replace the solenoid per findings