The steering wheel position sensor may fail, resulting in the service stability message being displayed.Google+
Car Problem Reports
Chevrolet Silverado 1500 Steering Wheel Position Sensor May Fail
Chevrolet Silverado 1500 Problem
Visitor, 2007 Chevrolet Silverado 1500, 70,000 mi
getting the "service stabilitrak" message, while driving on the freeway. Took it to the dealer, and they said that it's the steering wheel position sensor. However, about the same time, my power steering seems to go out when i'm trying to park in small spaces...