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Posted
The way I see it GM is manipulating MY IPhone not their IPhone. GM through their internal app intentionally lowers my phone volume when I push the ignition switch to turn on the motor of the truck but when truck is turns off the app doesn't increase the volume back to its original setting and its caused me to miss several important calls.
If GM doesn't fix this issue and eliminate this function I'll be forced to execute a lawsuit against GM

You also have the choice of using the work around that’s been discussed or simply even unpairing your phone & plugging it in.
  • Like 1
Posted

Dudes I have Great News. When I pulled up to park on Tuesday afternoon and cut the truck off  a message came up on the radio screen that a system update was available. Said it would take 13 minutes and you could not start the truck lock or unlock after the update was started. I hit the start button and let it do its thing for 13 minutes. After this update was installed the phone (IPhone 7) volume still lowers when bluetooth connects HOWEVER IT NOW GOES BACK UP TO the previous full volume when the bluetooth disconnects. Life is Good Again LOL GM FIXED IT!     

Posted
Dudes I have Great News. When I pulled up to park on Tuesday afternoon and cut the truck off  a message came up on the radio screen that a system update was available. Said it would take 13 minutes and you could not start the truck lock or unlock after the update was started. I hit the start button and let it do its thing for 13 minutes. After this update was installed the phone (IPhone 7) volume still lowers when bluetooth connects HOWEVER IT NOW GOES BACK UP TO the previous full volume when the bluetooth disconnects. Life is Good Again LOL GM FIXED IT!     

That could be great news if GM released another update in the last few days. What year is your truck, and can you please post the software version number?
Posted

truck is a 2019 Denali Ultimate unfortunately I did not get a pic of the update so I do not know the exact description but remember it said that it would take 13 minutes to do and had something to do with the entertainment/phone system. Funny thing is I did not even notice the phone turning back up after disconnecting until a day or so later. Never even thought about the update affecting that but hey I am very happy that it WORKED for that. Keep a close eye on your center screen and you should see the update request when you stop and cut the truck off. Just follow instructions on the screen and you will be good to go!  

 

now if I can get the wheels and tires to stop trying to shake off the truck, Life will be good again........

Posted

You can go to the info page and get the current software version.

I am not aware of any new updates to correct the volume problem

Tom

  • 4 weeks later...
Posted

2020 Blazer. I have the problem with iPhone XR ringer volume turning down low after attaching to Bluetooth in vehicle. Applied fix suggested earlier in this thread. Seems to work sometimes but not consistently. Was hoping recent IOS 13.4 update would help. It didn’t. So now hoping GM comes up with a fix soon..

Posted

only fix is to have GM disable the muting all together. Turn truck on, immediately system mutes your phone, turn truck off and no more communication between truck and phone. Theres no fix other that disabling

  • 3 months later...
Posted

Same issue with my 2019 Sierra. It’s gotten to the point where I am leaving Bluetooth off on my phone because I was missing so many calls. I am on the road for my job so countless times per day in and out- indubitably I would forget to check my ring volume on one of those trips and I’d miss numerous calls as a result. 

  • 3 months later...
Posted (edited)

2021 Silverado RST, purchased in Oct. I have all of the same issues as well. 
Btw, I just upgraded to the new I phone 12 and that did not change anything at all. I came from an I phone 11. Puzzled? 

Edited by Dustin53
  • 1 year later...

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