Jeremy Stephens

Thanks, I appreciate the help. Is there a decently affordable scan tool for this application?

I am aware im posting for a 2019 in a 2018 subforum. The tahoe runs a year behind the trucks. I have a 2019 tahoe 5.3 that just gave a p0455 code. Mass evap leak. I do have a upr catch can installed but I don't think it is the culprit. The only symptoms the truck has is a slight mileage drop and a smell in the cabin of used oil that comes and goes. I do not have issues filling the tank with fuel, no gurgling or anything. I did order a vapor can purge solenoid that installs near the throttle body just to have a starting point. I have not seen any loose hoses. Is there a repeat offender that causes this code? Where else should I look?