Not starting.

newjonwayne · Nov 16, 2024

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 · Nov 16, 2024

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

Geotrash · Nov 16, 2024

newjonwayne said:
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 · Nov 16, 2024

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 · Nov 16, 2024

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 · Nov 16, 2024

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

newjonwayne · Nov 16, 2024

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.

j91z28d1 · Nov 16, 2024

newjonwayne said:
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.

very rare you'd fry a bcm changing an intake, especially with the battery cable off.

before you go get one, check that those modules you can't talk to with the scanner have power and ground at the correct pins in their plugs.

this sounds like a missed ground wire somehow.

wjburken · Nov 16, 2024

newjonwayne said:
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.

Listen to what people here are telling you.

This for sure sounds like a broken/bad ground cable. You can check by putting the black side of a set of jumper cables from the negative post to the engine block.

Charlie207 · Nov 16, 2024

Check the grounds on the front of the passenger cylinder head, back of the driver cylinder head (you said you checked), and down on the bottom of the block on the driver's side below/behind the power steering pump.

A loose connection on the front of the passenger cylinder head will prevent your systems from powering up.

Not starting.

newjonwayne

TYF Newbie

PG01

Geotrash

Dave

newjonwayne

TYF Newbie

PG01

Doubeleive

Wes

newjonwayne

TYF Newbie

j91z28d1

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wjburken

Charlie207

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