Had the CEL light turn on after having to take a dirt road as a detour. Maybe 5-6 miles of bumpy road. When I got to where I was going I looked over the car to see if anything was different. Something smashed or lose wires and did not see anything that stood out. Radio still worked. Now a few of the times i start the car this happens.

http://www.youtube.com/watch?v=3kFbqG1bwV0

 

That seems really rythmic, like it would be trying to say that there is a fault in the radio. Like it is done on purpose. Maybe see if a local member would let you swap radios really quick to check it out?