I got this error code today on my 2003 Silverado. Gas cap was on tight. Read that it could be one of the following:
EVAP canister purge outlet tube (EVAP canister purge valve to EVAP canister) blockages or kinks.
EVAP canister tube (fuel tank to EVAP canister) blockages or kinks.
Fuel vapor elbow on EVAP canister contaminated.
Restricted EVAP canister.
Canister vent (CV) solenoid stuck closed (partially or fully).
Plugged or contaminated CV solenoid filter.
EVAP canister purge valve stuck open.
Fuel filler cap stuck closed (no vacuum relief).
VREF circuit open in fuel tank pressure (FTP) sensor.
Damaged FTP sensor.
Where is this cannister they reference? I cleared the code with my reader, but would like to inspect the problem further. Not sure if it's related or not, but my 4WD switch wouldn't work this afternoon either and the dash read "Service 4WD". Got home, turned it off, got the reader and the 4WD switch now works again??
Any help would be greatly appreciated!