Quote:
Originally Posted by nicktechla
And if the keyfob batteries died while you were driving, you wouldn't want the car to shut down
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This is one of the practical aspects of the functionality. You don't want the car shutting down unexpectedly (fob battery dies, kid drops key out the window, etc.).
The real reason, from what I've read, has to do with federal regulations, and the fact that a security code transmitted wirelessly can be considered a "key" for the purpose of satisfying these regulations. Once the code is received, the "key" has been inserted, whether the transmitter is present or not.
See S5.2.1 here:
https://www.ecfr.gov/cgi-bin/text-id..._1114&rgn=div8
This means the vehicle can't allow the "key" (i.e. the stored electronic code) to be removed while the vehicle is in Drive.