2015 Tahoe issues

[Heymatt]

Picked up a new Tahoe last week. Did the Onstar registration at the dealership. No issues. Two days later, Onstar starts dropping out, microphone and internet stop working. Work Intermittently for the next few days.
Check to make sure it isn't operator error. No go.
Schedule a service visit. Updates are current, vehicle powered down and rebooted. Code for HVAC discovered stored.
Everything functioned normally on my way to work. Leaving work, no Onstar, microphone or internet.
Anyone else having similar issues?

 

[68 Grand]

Betting this is your issue:

http://sandyblogs.com/techlink/?p=3495

 

[Heymatt]

Latest update. Two weeks ago electronic interface replaced. Worked fine for four days, next four days intermittent operation after sitting outside. But would come back after driving for 20 minutes and work fine. Next few days worked perfectly, 7 hour road trip, zero issues.
Back to the dealer, for another two days, unable to replicate issue. Onstar tells them, no phone number associated with the account.
How does it work if it has no phone number for Onstar to communicate with the vehicle ?
Four weeks of ownership, one of the four was spent at the dealership.

 

[Heymatt]

Scheduled to go back to the dealership. Same problem continues............
Problem seems to happen between 12:00-5:00, when the vehicle interior is hot.
Everything starts working after the ac is on, and the vehicle starts to cool down.
Someone else has to be having similar issues.

 

[Heymatt]

Latest update. Back from the dealership after another two days. Rearview mirror assembly replaced.

 

[Heymatt]

And back to not working.

 

[68 Grand]

And back to not working.

I'm betting that this is the pinched harness on the left side of the instrument panel that I linked to above. Have you printed the Techlink page and presented it to your dealer?

 

[Heymatt]

I'll run it by them, can't hurt at this point.

 

[Heymatt]

Going back to the dealer for attempt number five to fix the same problem. Plan is to replace the harness that supplies power to the Onstar module.
And yes, I did provide them with that link for the dash harness.

 

[Heymatt]

Back from the dealership after five attempts. Looks like we have a solution! Three days straight without dropping out. Those of you more familiar with the wiring of a Tahoe, here's what was done, maybe some one can explain it better in non dealership speak.
*The notation in pen on the invoice is from us.