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sounds like the fuel pump control module is going goofy, you can try taking a look at it and the wire harness/connector and see if anything is corroded, loose or damaged, clean it up, clear the codes and see if the error stays away.
Do you know the location on a 2012 Yukon Denali XL? My frame was recently swapped out. i wonder if the wire is chaffing somewhere..
Thank you! I found it. Need to drop the spare & test the wiring harness.
I pulled the wiring harness. Everything looks fine. Confirmed constant 11.8 volts with ignition in "ON" position. When I erase the codes they come back within minutes. Truck continues to run fine.
Man that sucks, this is where a tech2 would come in handy so you could confirm that the module is bad or not, could maybe be wiring or even something else, unless you know of a shop that doesn't charge dealer prices and has a tech2 or a good snapon or something then your kinda stuck, have you checked all your fuses? I know the fpcm has it's own fuse but I would think if the fuse was blown it wouldn't control the fuel pump and you would have a no start but might be worth a look anyway. maybe @swathdiver has some other idea's?
