Howard Shipley

My earlier post regarding the volume being turned down on my Iphone after connecting with the infotainment system in my 2020 Sierra is no longer valid. The fix I employed from TSB # 19NA270 worked until my system updated to v148. Neither work around mentioned in the bulletin now fixes the problem. If anyone has found a solution, please post.

I experienced same issue of volume going down and staying down even after leaving the vehicle. Was missing phone calls and text messages. I followed the advice given in TSB # 19NA270 and no longer have this issue after turning off the "change with buttons" setting. I have an iphone xs with ios 13.3 and a newly purchased 2020 GMC Sierra. I too am very disappointed with GM for removing the text message feature from their infotainment system as was on my 2017 Sierra. With Apple car play plugged in one can get messages but it is ridiculous to be required to plug a phone in so one can receive text messages. And why GM still requires a cord for car play in 2020 is beyond belief. The phones have supported wireless car play for quite some time as well as many car manufactures. GM is way behind with their infotainment technology and needs to update their systems ASAP.