iPhone is continually lowered when connect to GMC

[krb49]

Didn’t work for me either iPhone XR.  

[Kevinsgmc2020]

Same issue. Thought it was me. 90k on a Sierra 3500 dually and can’t tell when my phones ringing!! Very aggravating!!

[eppieguy]

On 7/23/2020 at 8:23 AM, MCM3M said:

Hmm, worked for me. Is your problem with an iPhone?

Yes, Pro 11 on 13.6

[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. 

[Gatorz62]

2020 Sierra 2500 Denali.  Same issue and the "fix" (sounds and haptics) does not work.  I Phone XR with latest update as of today.  Also, updated latest software for the truck.   Frustrating.  For now I have just disconnected my BT from the vehicle.  

 

I have also had issues with radio muting itself with no fix until the engine is turned off for a couple minutes.   

[22’s]

Got something for people to try. Go into settings, go to Siri, go to announce messages, and turn that off. This worked for me. 

[SPASierra]

Checked both of my phones, and neither one have "Change with Buttons" turned on.  Just got the truck a week ago, and this has already become annoying.  Will check the version on my Infotainment as well.

[cordelearts]

Simple fix, the sound is controlled manually by the volume steering wheel. Sometimes the volume is behind the steering wheel like you are holding it.