Not starting.

[newjonwayne]

Took the intake off today to replace the intake gaskets and after I put it all back together and relanded the ground on the battery my 2007 Yukon 5.3 will not start. It has no interior lights, locks don’t work, gear indicator line doesn ’t work either. Some lights do light up on the garage cluster but there’s no actuation of the starter at all. Before I started on it, it started just fine.

 

[PG01]

Go back to the last thing you touched… battery cables.

 

[Geotrash]

Took the intake off today to replace the intake gaskets and after I put it all back together and relanded the ground on the battery my 2007 Yukon 5.3 will not start. It has no interior lights, locks don’t work, gear indicator line doesn ’t work either. Some lights do light up on the garage cluster but there’s no actuation of the starter at all. Before I started on it, it started just fine.

+1 to @PG01 above. Also check battery voltage. Are you sure you didn't remove any grounds in your work? Don't forget the braided ground cable on the firewall and the one on the front of the pax cylinder head. Did you remove the cable from the alternator to get the intake off? It runs right over the top of it.

 

[newjonwayne]

I’ve cleaned battery cables. Checked mega fuse, never touched the braided cable on driver side but it is tight on both ends, and I took off the alternator and the cable is back on. Still nothing

 

[PG01]

Seriously tho, your battery cables may look good on the ends but rotten in the middle… and you just moving them may have done it in.

 

[Doubeleive]

yep, your symptoms are "classic" power/ground related.

 

[newjonwayne]

Hooked my scanner up and looks like I may have a bad bcm. Engine, trans, and abs systems have a U0140 Lost communication with body control module. It’s showing it in history and current. I was pulling fuses so seeing how it’s current and they’re all back in and were good I’m thinking it’s a bcm issue.