2004 Silverado 2500 6.0 no crank no start
 

I am in dire need of assistance. I have a 6.0 that I originally thought had the starter go out on me so what do I do, go buy a starter and replace it. Well no luck there so I figure that my ignition switch is bad. That's not it. So I do what everyone's first step is and check my fuses and relays. Nope not it, everything checks out good. Battery is good, plugs and wires are all good fuel pump and filter are great.... Should I be worried it's my BCM??

Any good news?just saw post, sometimes another gets started,right after you posted, burying yours,so, follow start wire from starter back to relay center?

check: battery, air, spark, fuel. it's always one one them.

yes. don't throw parts it's really expensive and wasteful. get a chilton's book. diagnose the problem, replace just one part. you can do it.

when i worked i was forced to diagnose for free within 30 min. for ANY job (sold to customer, no backing out) - if i was wrong i was fired. i was very rarely wrong (luckily?)

you have to test each part in a determined order. you can't just guess. really pick a part. fully check it. then move on.

After checking battery AND cleaning terminals and tighten up (don't skip that - ever - always any repair do it first).

Don't skip around. For example: start at the air intake and work your way to the engine. First is Filter (take it out, clean box). Next is MAF: insure it's clean and straight - it may be expensive don't damage it - it's only a little nichrome write - so yes it's a huge rip-off. Don't spray carb cleaner on the intake if you don't have to: it can damage a good seal (so clean it if you do, don't get a hot engine wet it would literally crack in two).

You could stop at the MAF and switch to spark, but if you go back to air start back at the maf. don't "skip things", don't skip around within the same system.

FUSES. don't forget spark (and energizing starter and what else) requires power. You can trace power from the source to component without skipping: use fuses to your advantage.

Check your relays in the fuse box under the hood.