Electrical

I own a 2002 Chevy Venture minivan. For a
week or so I had notice as I drove the vehicle
that the locking mechanism kept on turning
on and turning off the locks in my car. One
evening when I was driving home from work
the light started flickering on the vehicle and
it started acting like it was going to stall but
then stopped. After that happen the security
light came on on my dashboard after that
happened the security light came on my
dashboard message center. I have
researched it since then and have read that
there could be a short with the ECU fuse.
What I'm hoping to find out on here is if this
is a common occurrence with the Chevy
ventures and roughly how much would it
cost to have it fixed at a dealership.