Most likely, not? "Since the CAN protocol does not implement encryption or authentication mechanisms, it is vulnerable to different attacks such as denial of service, eavesdropping, and message injection [28, 15] " https://www.researchgate.net/figure/Encryption-methods-for-the-CAN-bus_tbl2_340817175
I know that it was uncommon to have encryption but, newer car are starting to have this feature. Many many RAV4 got stolen and all they had to do was to hack the car by plugging into the headlight wires.
Better than having to say goodbye to your car when some kids steal your car with a 300$ hacking tool?
Late to the discussion... Although CAN bus are not encrypted, the application layer can encrypt. For example, rolling codes can be used such as with garage door openers. Instead of sending the command <unlock doors>, send <unlock doors><pseudorandom code>. A hacker would have to send an acceptable pseudorandom code to unlock. I have no idea if any manufacturer does this. That is just one way that can slow down hackers. Cat and mouse game.
