Looking for alldata can bus

[jayco]

2016 yukon slt 4x4. Jumped into the vehicle and with my foot on the brake I hit the start button. Guage cluster went black with a No-Crank, No-Start. After a few seconds I hit the start button again and that left the the vehicle in the "ON" mode (engine not running). I then get lots of warnings such as: Shift vehicle to park, service 4wd, service power steering, service stabilitrac, low fuel (tank is full but guage reads zero), and a few others. So I grab my scan tool and plug into the obd2 port. It has power to the diag port but zero communication. I've tried a few scanners to no avail. I've checked all the grounds, load tested the battery, checked starter ect. I'm down to thinking I have a bad module somewhere but need to know the order of communication to start my process. Any help is appreciated.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

Your issue is consistent with a weak battery or degraded electrical connection.

You state that you load tested the battery. Was the load test performed on a bench load tester (battery taken out of the truck and taken to a place with a bench load tester device)? This is the most common cause of this issue.

Also, the primary electrical cables tend to rot from the inside ->? out. Have you checked these cables (battery positive, battery negative, battery to starter) with an Ohm meter to confirm that they still have almost zero resistance?

Other members of this Forum much more knowledgeable than me in this area will also chime in.

 

[Geotrash]

2016 yukon slt 4x4. Jumped into the vehicle and with my foot on the brake I hit the start button. Guage cluster went black with a No-Crank, No-Start. After a few seconds I hit the start button again and that left the the vehicle in the "ON" mode (engine not running). I then get lots of warnings such as: Shift vehicle to park, service 4wd, service power steering, service stabilitrac, low fuel (tank is full but guage reads zero), and a few others. So I grab my scan tool and plug into the obd2 port. It has power to the diag port but zero communication. I've tried a few scanners to no avail. I've checked all the grounds, load tested the battery, checked starter ect. I'm down to thinking I have a bad module somewhere but need to know the order of communication to start my process. Any help is appreciated.

I second the hypothesis of a bad battery cable. Also check the plate-mounted fuses under the red cover on top of the battery for continuity across each of them.

 

[jaxscuby]

when i was charging my battery due to some unknown reason that the battery died..
after charging the battery & re-installing the battery, i mistakenly left one of the positive
cables off by mistake..and sounds almost exactly the same as what you're describing..

mine was the last one on the end, furtherest from positive terminal..just double check
the cables that feed from the positive terminal..