OK... So today... I jumped in my truck and viola! Carplay instantly was established with no effort. WEIRD! Because this is not what I usually experience. Running ios 14.4 on iphone 12. 2021 Silverado 2500HD, CC, Duramax.
But here's my new routine that seemed to work this time...
Turn on bluetooth on phone before I walk out of the house
Enter truck
Start truck
See what happens... today it worked. I exercised patience, let the truck warm up and the connection pretty quickly established itself.
Once thing I am noticing if I remote start the truck or activate bluetooth on the phone after I've been in the truck... no connection. So my current thinking is to have bluetooth on the phone activated prior, then enter the rig, then start it up and be patient.
Wifi was turned off. OnStar was very clear that wifi has nothing to do with a carplay connection. My data plan has expired that came with the truck. So I'm not getting that benefit.
BUT... I was surprised today by the reveal... not complaining, but celebrating. Will see what happens next time.
One thing I have noticed about headunits is they can be affected by temp. I have a suby outback 2015. I use it in the mtns all the time for skiing. It is always fussy about connections and controls on the touch surface until the car has adequately warmed the interior up.
Hoping my little trials are helpful to someone else... still experimenting. Side note... the steering wheel controls are exactly opposite of my suby... still sorting that one out as I drive... But i love the truck!