The Check Engine and VSC lights came on and
I had the codes read at a autoparts store. It came back as a 440 code. I replaced the Gas cap as per their recommendation (non OEM)and reset the lights, by disconnecting the battery cables for 15 minutes. The warning lights seem to be connected to the fuel level. After filling the truck up with the lights reset, they will illuminate at about 3/4 of a tank. No other symptoms, as the truck runs and drives great. It just keeps firing these lights.
A code P0440 could mean one or more of the following has happened: The gas cap is not installed or working properly
The purge solenoid has failed
The canister is plugged and not working properly
Possible SolutionsWith a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try: Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
Inspect the EVAP system for cuts/holes in tubes/hoses
Inspect for damaged or disconnected hoses around the Evap purge solenoid
Check and/or replace the sensor
Check and/or replace the purge valve
Have a professional use a smoke machine to detect leaks