GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hi there, I am Cam. Can I get your first name please?
John ,That fuse feeds three things, the pcm, the mass air flow sensor in the air filter duct, and the fuel pump flow control module. My thoughts are that you have a short in the wire that happens every once in a while and pops the fuse. I would start with the exposed wiring at the mass air flow sensor. It's the pink wire. Then if you see nothing, have a look as the wiring harness goes around the engine. I know it's not the best for visibility but see what you can find. Then next we need to check that pink wire that runs to the fuel pump control module under the back drivers side of the vehicle. And chaffed wiring, corrosion on the terminals and that sort of thing will cause this. If you can't find anything, then see if a 15 amp fuse lasts.
Let me know what you find.