When using car play I find some times my phone will not rescind to hey Siri. Even after unplugging it from the car. If I wait a while it works again. Sometimes I have to toggle hey Siri in settings off and back on. This seems to be intermittent. Chrysler Pacifica 2019
Hello Bradford Bosley,
Welcome to Apple Support Communities!
We understand that Siri intermittently does not respond when using Siri with CarPlay. We’d like to help.
Is your device updated to the latest version of iOS? If not, back up and Update your iPhone, iPad, or iPod touch.
Try initiating Siri using the command button on the steering wheel, then try using the CarPlay buttons on the touchscreen display as detailed in Use Siri to Control CarPlay. Does the issue persist with both methods?
Take a look at the suggestions in If "Hey Siri" isn't working on your iPhone or iPad.
Yes it works those ways. But I'm not even sure the car is related. Because I notice even not connected to the car there are times saying hey Siri does nothing. I either have to toggle it off/on and go thru set up again or restart my phone. iOS 14.6 yes up to date.
If after you're still having trouble with Siri after updating your device's iOS and trying the suggestions in those linked resources, we would suggest reaching out to Apple Support as a next step. Here's how to Get Support.
Have a nice day!