P2778 Possible Causes
- Faulty shift switch
- Shift switch harness is open or shorted
- Poor electrical connection in the shift switch circuit
How to Fix Code P2778
Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
Check Engine Light illuminated (or Service Engine Soon warning light)
P2778 Meaning
The Engine Control Module (ECM) monitors the shift switch circuit signal. The ECM sets the OBDII code when the shift switch circuit signal does not meet factory specifications.