Anyone know what can cause the computer in my '06 Grand Prix GT w/SC, auto trans, to display 'Service Traction System' and 'Reduced Engine Power'? Also get the check engine light. Only happens when my wife drives it, go figure. I gave the trans a service, new filter and Dexron VI. Wondering if worn rear brakes could cause problem. Any help would be appreciated. Please respond at bemedia52@yahoo.com.

Thanks!