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iPhone is continually lowered when connect to GMC

TRyan8
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TRyan8 Enthusiast

TRyan8

Posted
Posted

My iPhone has the volume turned down ever time I connect to my 2019 GMC AT4.   I had the phone checked and all diagnostics came back fine.  You have to manually adjust the volume on your phone when entering or leaving the truck. to avoid missing calls.  Spent numerous hours trying to figure this out.  It works fine in my wife's Ford Explorer.  So,  I took it back to the dealer to find it is a know problem and GMC has no updates to fix it.   Has anyone experienced this and found a resolution, as I am confident after speaking to GMC that it a program coding issue for them.  

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Chevyfan86
Chevyfan86

The calls are missed when you leave the truck.  The phone volume can be wide open when you get in the truck and will automatically go to zero when it connects to bluetooth.  When you get out of the tr

RSmock
RSmock

https://static.nhtsa.gov/odi/tsbs/2019/MC-10169351-9999.pdf   This is the fix for the volume issue on GM vehicles with iPhone. 

Z71RST
Z71RST

I'm having the same issue. I Just upgraded to IOS 12.2 Last night and this morning in my truck, it did the same thing again. So the last 2 versions of IOS has now dropped down to 2 bars on my volume.

O Town Denali Enthusiast

O Town Denali

Posted
Posted (edited)

I started experiencing this same thing about 3 days ago.  I have had my truck for about 4 months and it just started doing this.

I am on version V 509 and it has not updated since the end of Dec so I do not know what changed.

 

You can go to "sounds" and turn the "change with buttons" to off and you phone should still ring.

 

Edited by O Town Denali
Cmillerjr Enthusiast

Cmillerjr

Posted
Posted

The only time mine automatically lowers volume when connected is when it’s on silent. 

MDSilveradoGuy Enthusiast

MDSilveradoGuy

Posted
Posted

I am not sure it is necessarily an issue with the truck. What version of iOS are you running?

 

My 2015 Colorado with the IO4 stereo (4.2" display but BT/Streaming and everything else) started doing this with my iPhone Xs Max earlier this week - right after my last iOS update.

lebag335 Enthusiast

lebag335

Posted
Posted

IOS 12.2 iPhone X in a Silverado Trail Boss LT.  Lowers my volume on the phone to 2 bars every single time.  Infotainment version is 509.  I haven't yet received the update for 803.1.

O Town Denali Enthusiast

O Town Denali

Posted
Posted (edited)
56 minutes ago, MDSilveradoGuy said:

I am not sure it is necessarily an issue with the truck. What version of iOS are you running?

 

My 2015 Colorado with the IO4 stereo (4.2" display but BT/Streaming and everything else) started doing this with my iPhone Xs Max earlier this week - right after my last iOS update.

I am thinking this is the issue to.  I only started having this problem in the last 7-10 days and that is when I was upgraded to 12.2. Could be a coincidence though.

 

My truck updated to 803.01 yesterday and that did nothing for the issue.

Edited by O Town Denali
Z71RST Enthusiast

Z71RST

Posted
Posted

I'm having the same issue. I Just upgraded to IOS 12.2 Last night and this morning in my truck, it did the same thing again. So the last 2 versions of IOS has now dropped down to 2 bars on my volume. That leads me to believe it's the truck, not the phone or IOS. The only thing I've thought of doing is to turn off Bluetooth on my phone, and just plug it in and use the vehicles apple play. By far the most annoying thing that's happened since buying this vehicle. Side note, We bought a 2019 GMC terrain at the same time. It doesn't do this to my wife's phone or mine. Same 8" screen, hers however has navigation. My truck does not. Ready for them to fix this...

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Loco-diablo Senior Enthusiast

Loco-diablo

Posted
Posted

Is the issue your speaking of when connected via Bluetooth? Or CarPlay via a cable? Or both?


Sent from my iPhone using Tapatalk

BeardBros Enthusiast

BeardBros

Posted
Posted

I also have the same problem. iPhone XR with the latest IOS and 2019 HC with the latest update. As soon as I the phone links up to the truck Bluetooth it turns the phone volume all the way down. It pops up on the phone screen when it happens. I do not have this problem in my wifes 2015 Acadia Denali. I have played around with every setting and cannot come up with a solution besides turning my volume up after I leave the truck every time. Very annoying.

sicilit Enthusiast

sicilit

Posted
Posted

i have this issue too. only on Bluetooth. If i have it plugged in it is super loud. My phone is normally on vibrate, so I will pay attention if it changes when I have the ringer on. I have iOS 12.1.2 and this has been this way since November when I first got the Truck. I have done 3 Infotainment Software updates so far.

2019silverado Enthusiast

2019silverado

Posted
Posted

I bought a 2019 High Country in November '18 and it's been lowering my iPhone 7 plus volume almost all the way down since day one.   I've tried everything and have had 2 updates to the truck software since,  and it still continues to lower the volume way way down.  Very annoying.

econometrics Senior Enthusiast

econometrics

Posted
Posted

Are yall saying that the Infotainment system lowers the iPhone volume only when the phone RINGS? Or with music as well? 

 

I have 803.1 and an iPhone XS 12.2 iOS, and this has never happened to me via Bluetooth connection. 

sicilit Enthusiast

sicilit

Posted
Posted

I had a 2019 LT Z71 as a loner with the smaller Infotainment screen than my truck and the phone volume was fine via Bluetooth. I had my phone on vibrate at the time as well.  

6t4 New Member

6t4

Posted
Posted

SO funny, I guess I am not the only one....OK GMC....read this board and update your software.......this is a major annoyance glitch! stop messing with the iphone volume control. let stand where it is set.....if it blows the speakers, right a software clipping signal software program for the amplifier circuit!

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