P0780 Shift Malfunction
What does P0780 mean?
P0780 — Shift Malfunction. This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects shift malfunction. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0780
- Internal transmission mechanical wear
- Faulty shift solenoids
- Low or contaminated transmission fluid
- Valve body wear or sticking valves
- TCM or wiring problem
How to fix P0780
- Check fluid level and condition, and look for debris
- Read all transmission-specific codes to isolate which circuit failed
- Monitor commanded vs actual gear shifts on an OBD-II scanner
- Inspect the valve body and solenoids
- Plan for transmission repair if shifting cannot be corrected with parts