Re: CarPlay can’t connect
Wondering if there is a firmware update available from the car manufacturer for its system. The car manual, or the car-manufacturer's support website may have details on any firmware updates if necessary to keep everything compatible with the newest features.
Re: Ask Siri Greyed out 18.6.2
Siri may be expecting input from the car, which doesn't arrive ?
(Eg: you may see other Siri options displayed if disconnected from CarPlay (via Bluetooth or cable)
What to do: If you need help with CarPlay - Apple Support (NB: Step 7 also suggests firmware update)