P2777 Possible Causes
- Faulty gear shift switch
- The gear shift switch harness is open or short-circuited
- Poor electrical connection in the gear shift switch circuit
How to Fix Code P2777
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
Engine light on (or service engine soon warning light)
P2777 Meaning
The Engine Control Module (ECM) monitors the signal from the gear shift switch circuit. The ECM sets the OBDII code when the gear shift switch circuit signal does not meet factory specifications.