HUD Gap missing, both cruises do not engage

[gdog7]

I have a 2021 GMC Sierra AT4 diesel.   Went to use cruise and wouldn't work.   I can toggle through cruise and adaptive cruise and it says it's available, but it won't engage on either.  Also gap is missing in HUD.  Everything stopped working at once.  Have an appointment, but they are 3 weeks out to look at it.   Is there anything simple like a fuse I can check? 

[gdog7]

I have a 2021 GMC Sierra AT4 diesel.   Went to use cruise and wouldn't work.   I can toggle through cruise and adaptive cruise and it says it's available, but it won't engage on either.  Also gap is missing in HUD.  Everything stopped working at once.  Have an appointment, but they are 3 weeks out to look at it.   Is there anything simple like a fuse I can check? 

[2016 Sierra Owner]

It sounds like the camera as adaptive cruise and the gap uses that to work. Is there a check engine light on? Maybe try unhooking the battery for about 10 minutes and see if that resets it. 

[gdog7]

Thanks, no engine light,  I did disconnect the battery, but issues persist.