most likely has nothing to do with your tires. Call OnStar and see what Check Engine Light (CEL) codes they're pulling up. Ask to speak to a technician. If you have a crank shaft position sensor P0355 or something like that, then it's most likely a wiring issue.
http://www.camaro5.com/forums/showpo...2&postcount=16
There's also another document that's related to v8's specifically, but basically says the same thing. OnStar TECHNICIAN should be able to look this up for you during normal business hours.