Justin Tilton

Update for anyone that runs into this issue. I replaced the high pressure fuel pump and it solved the issue.

Thanks for the replies. Researching more on it last night, I agree its a fuel injector or High Pressure Fuel Pump. Is there a good way to tell which one it would be? I have spoken to someone that had the same dieseling after shut off. His ended up being the fuel pump. But also read rich on both bank 1 and 2. Mine has only been showing bank 1. Would this be any indication that its an injector on that side instead of the fuel pump?

2015 Yukon. Throwing a P0172 code. I have changed the MAF and MAP sensors. No change. If I clear the code, it comes back within 15 minutes of driving. There is also a very noticeable fuel smell. The engine will also shake (shudder) after shutting off. Looking for anyone thats dealt with this and had the same issues. I know P0172 can be many things. I dont want to replace everything trying to figure out what it is. Any help would be great!