05 TAHOE WITH ALL KINDS OF ISSUES

[John Fleming]

05 Tahoe 4WD 5.3L

Hi,  so I'm helping a friend fix his truck. Driving yesterday and rounded a corner, service 4 wheel drive message came on (possibly unrelated but a first for this truck), then it died and wouldn't restart. Towed it home and some of the dash lights seem to be staying on with the key removed (will post pics of the ones staying on once he sends to me), no crank no start, and no communication to the scan tool. I have checked fuses and have power at the DLC but no communication. Does anyone have any suggestions on where to start?

Thank you

[John Fleming]

Dash stays like this indefinitely after key is shut off. Last night the airbag light and battery were staying illuminated as well.

[richard wysong]

check the body and engine grounds by doing a voltage drop test. bad grounds can cause the system to back feed doing all sorts of strange things. Quick test using jumper cables may work as well

[John Fleming]

When you say quick test using jumper cables are you referring to just jump starting the truck or do you mean jumping the engine and body grounds to negative? Thanks for your reply

[richard wysong]

jumping the grounds

[Ak_grown]

possible ignition switch issue? common issue 

[dna9656]

When it's impossibly weird look for bad grounds.

[John Fleming]

Thanks Richard, I'll give it a go as soon as our work schedule and weather permits.

 

53 minutes ago, Ak_grown said:

possible ignition switch issue? common issue 

Was my first thought as well but just didn't feel right to me. Hopefully it is just a bad ground somewhere.

 

Will report back.

[John Fleming]

Looks like we got it fixed. broken ground behind the pass. head thats common on these.

Thanks for everyones help.

[Ak_grown]

good to hear. ill log that ground location into common issues for that year