My father is having problems with his 2005 Yukon, it won't start. He found out the PCBM fuse was blown. He has tried replacing the fuse a couple times so far, he also says his dash lights up and the tachometer is also acting weird. But after he changes the fuse the yukon will run, but as soon as he turns it off and checks the fuse again it's blown. What possible problems could he have we know the PCMB fuse powers the PCM and fuel pump. Could the fuel pump need replaced, or do you suspect its faulty wiring?