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Hello, I have a 2018 Mustang Ecoboost with the Sync 3 touchscreen radio and I've noticed that the screen will not turn on when it is cold outside. After the car has been running for 30 minutes to about an hour with the heat running inside the radio and screen will then turn on. I've noticed that the usb ports will not have any power at all but I can still control the temperature with the dials even though I cant see what temp its set to since the screen will not be on. I tried doing the reset where you hold the power button and next track button at the same time and that has no effect on the radio at all. It will only turn on after the car is completely warm inside. Has anyone had a similar issue or have any ideas what this could be?
 

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Should still be covered by warranty , contact dealer . Another thought , sometimes when battery in low condition in some cars it will cut off non essential items , especially if others needed are being used . Then when driven for a while the alternator has boosted the battery enough and they will function normally again . Could check your battery voltage first thing in morning before starting .
 

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UPDATE: Checked my battery voltage after the car was sitting for a few hours and it was down to 11.3V so just to be safe I went out and bought a new battery and installed it. This did not fix my problem so the next step I'm taking it to get it to a dealer to have them look at it and fix it. I will update again about what the issue was once its fixed.
 

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11.3V is a faulty battery or at least needing charged . Might be worth doing the same check with your new battery as you could have a parasitic drain .
 
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