CarPlay Disconnecting - iPhone XS Max

"Tested 100% battery this morning, no disconnect. Got out of car maybe ran the battery down to 98%, got back in car, phone disconnected, but noticed as soon it was at 100% the phone stayed connected again. iPhone Xs in Audi S5 Sportback"

INTERSTING! Well, that's progress I guess... wonder if it is the amount of power the phone is trying to pull from the USB port... Apple should be able to fix this via an update I would think...

Very good finding
I have tested my iphone XS with 100% battery and Carplay has not been disconnected (using Waze, Spotify, phone). 2018 Audi A5 Sportback.
In my wife's car, 2018 VW Tiguan, disconnections also occur when the iphone XS battery is not fully charged.

I hope Apple can solve the problem.

Since it's starting to look like a power issue, has anyone tried using the USB adapter through the cigarette lighter, wondering if the USB ports in the center console are part of the problem. Can you tell we're getting desperate?

No, the car is still a variable, your logic is flawed. As I already said if Audi's head unit maker used a chipset that is flawed and did not strictly adhere to BT standards and USB standards (assuming you connect with USB) it could indeed cause this problem. This thread and all of the others are predominantly Audi with some Kia thrown in for good measure. If the XS and XS Max are working on all other vehicles except these two models, how does that indicate it is solely and Apple problem?

I agree that people with the problem should report it but I also recommend that they not stop at the Tier 1 level, ask to be transferred to a supervisor or Tier 2, or Customer Service. Volunteer to assist in fixing it. Spend your time doing that instead of posting here.

It’s been a while since I have posted to this thread. I have a 2018 Audi Q7. A couple of months ago it seemed that Audis were the only cars impacted by this issue, but all the recent posts point to this being a widespread problem across many different car manufacturers. As impractical as it is, the only solution that has partially worked for me is to connect the phone when it is at 100% charge. I managed to have Waze remain connnected during a three hour road trip when the phone was fully charged. That said, as soon as a call came in and I answered it, the phone disconnected a minute later, reconnected itself 30m seconds after that, and then stayed connected for a couple of additional hours. Unfortunately, even at a full charge, it appears that the only way to keep some stabiilty is to run one application at a time. Impractical and unacceptable. Btw, I have found that if the phone is below 90%, there is no shot of it staying connected for any length of time, even if CarPay is sitting at the menu screen idle. A formal acknowledgement of this problem by Apple (with the prospect of an imminent fix) would at least help to mitigate the frustration of its customers who keep trying onerous troubleshooting steps which don’t correct the problem or who are resorting to spending additional money to purchase hardware such as USB voltage meters which may have negative long term effects on the battery.

There may be more than one cause and hence more than one solution. On my XR power was not the problem - I put on a wireless charger and it didn't help at all. My problem was network connections coming and going (as they do when you're driving). I think iOS 12.1.1 is better, so check that you have that. Reset network settings to start clean there. VPN was causing trouble for me, so I disable that when driving. I also disable wifi while driving. With those done I get good behavior from CarPlay. Engaging airplane mode was a solid but impractical solution, but helped in diagnosis. Let us know if you find a solution.

I thought my issues had been corrected by the 12.1.3 update and my XS Max was running carplay fine even on non Apple cables (however they are MFi certified).

Went on a long drive yesterday and it reset a couple of times.

However, I think reset is a mis-characterization of the issue.

It is related to notifications from Apple Maps.

I correlated the screen dropouts to the exact timing I received a "You are 14 mins from home" type notification from Apple Maps.

Therefore I may disable notifications from Apple Maps to see if that fixes the final issue.

However, this morning I see there is an available update to 12.1.4 so not sure what that now fixes.

2018 Jeep Grand Cherokee Summit

Audi Q7...also working on getting the updated OS for the car. The have a bulletin on it. Didn’t sound like an official TSB but they knew about it.

I have full WiFi configured and enabled. The fix for me does seem to be isolated to removing Google Maps. I haven't messed with anything else.

Same exact problem. Switched from IPhone 7 Plus to IPhone XS MaX on my Audi Q7. Iphone 7 Plus running iOS 12 had no issues. IPhone XS Max keeps disconnecting exactly as others have described on this thread. I deleted my CarPlay profile on both my phone and vehicle and I tried erasing and resetting my networking settings. I had a glimmer of hope because my phone stayed connected for 20 minutes as opposed to 2-5 minutes. That was a short lived solution and now it is back to frequent disconnects especially if the Apple Maps or Google Maps navigation is engaged. Contacted Apple Support and they suggested that I do an Itunes restore to default and set my phone up as a new device (and not restore from iphone 7 backup). I have been delaying doing this because it is a pretty big hassle to rebuild the phone and I wanted to see if anyone else was having the issue. It appears some on this thread have tried resetting the phone and it did not resolve the problem. There are also quite a few Audi’s involved in this thread. Not sure how to proceed at this point, especially if resetting the phone does not correct the problem.

Same here. So after reading this thread, I uninstalled google maps to see if that was the issue. Worked fine on my commute to work, but 3 disconnects on the way home. Turned off WiFi and haven’t had another disconnect yet. Going to try without WiFi on tomorrow and see how that goes. This is beyond frustrating. Should we start a new thread since this one said “solved” previously when this is still a legitimate ongoing issue???

I checked with Audi and they pointed the finger at Apple. I find it hard to believe it’s on Audi’s end when previous phones and iOS 11 worked well. I seem to notice if I turn WiFi off it works better and then will disconnect as soon as WiFi turns back on or sometimes the phone automatically turns it back on too and it will disconnect. HIGHLY frustrating, would be great if Audi and apple could talk so this is fixed and we get the value out of these expensive items...

Exactly the same problem here. I’m in the UK with a 2017 S4 Avant. I noticed the the phone keeps going off and on charge, like the cable is being disconnected and reconnected. I also noticed a message in the MMI stating that the USB device has a power supply problem. Could the XS Max be drawing a little too much power from the car? All is fine when I connect it to a lighter socket charger.

I’ve been observing this problem and for me, the issue disappears when the iPhone XS MAX reaches 100% charge. This may be a coincidence but once it reached 100% I couldn’t replicate the issue...so it could be a power management issue? Could someone else see if this is the case for them?

It sounds drastic but I’ve just bought a usb hub on Amazon with power delivery, along with a 10w usb cigarette adapter, I’m going to plug the usb hub into the car’s USB port, then wire the cigarette usb to the usb hub to provide extra power, then plug the iPhone into the usb hub. No idea if it’ll work but I’ll post when I find out 😆