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unixadm

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Some 2021 Mustang Mach-E/F-150/Edge/Nautilus vehicles may require a reboot of the SYNC 4 system.

For vehicles equipped with a volume/power and right seek button, press and hold both the volume/power and right seek button for 10 seconds and the system will reboot.

For vehicles not equipped with a volume/power button, holding the seek right and volume down buttons on the steering wheel controls will reboot the SYNC 4 system. The Workshop Manual (WSM) is in the process of being updated with this procedure.

APPLICABLE VEHICLES
2021 CAR: DQ CD539N EDGE
2021 TRUCK: FD P702N F150
2021 CAR: D9 U540N MKX
2021 CAR: GW CX727N C-EV
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GABAR

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So the SYNC 4 soft reboot procedure is similar to SYNC 3.

I say just do a Master Reset and not deal with the soft reboot.
 

blind56

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This just helped me. Was driving around town yesterday and in between stops, the head unit completely froze and was unresponsive. I was close, had power and the screen off button pressed but it didn't do anything. Googled it and ended up here to tell me to use power and right seek.
 

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GABAR

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This just helped me. Was driving around town yesterday and in between stops, the head unit completely froze and was unresponsive. I was close, had power and the screen off button pressed but it didn't do anything. Googled it and ended up here to tell me to use power and right seek.
This is called a soft reboot.
 
 




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