I have an 2002 GMC Sierra truck and my check engine light stays on. I had it scanned and the code P0440 showed up. Mileage is 149,231 and it's an automatic. The gas cap looks fine to me, but then I don't know much about cars or trucks. I do smell a very faint gasoline smell sometimes when standing outside of my truck. Problem is I am financially struggling and I would like to know is this problem going to cost a lot and can I continue to drive with this happening? I have had other problems with this truck, so I'm trying to fix one thing at a time. The truck has been in my family for a long time and I would hate to get rid of it. Of course I don't want to get ripped off with a mechanic around here, so I found your channel (subscribed btw 😁) I love your videos Scotty and you are so much fun to watch! Thank you!! 😊
If you smell gas outside the truck, you definitely have a problem with your evaporative emissions system. Though it could be a number of not-cheap problems to fix, you should probably replace your 20 year old gas cap before doing anything else. Gas caps are cheap and easy to do yourself.
Here's more info on your code: https://repairpal.com/obd-ii-code-p0440
