Remote starter not working Check engine light is on

I learned on this forum that the remote start won't work when a check engine light is on. Scan for fault codes and fix accordingly. Then the check engine light can be cancelled with the scanner and I would then expect the remote start to work again.

I'm having this same issue but how do I scan for fault codes? Do I have to take it to the dealer?

My cadillac 2014 cts remote starter not working and check engine light is on do i have to take it to a dealer to get fixed