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Message: <blockquote data-quote="ORVietVet" data-source="post: 22307" data-attributes="member: 9438">The steering position sensor is an important part of the StabiliTrack Electronic Stability Assist system, which is a sophisticated GM-designed system to improve vehicle stability and steering feel. The system includes a 'steering wheel position sensor,' which has one important function:<ul> <li data-xf-list-type="ul">The steering position sensor monitors the angle of the steering input in degrees, and reports that information to the ECU (the main computer in the vehicle)</li> <li data-xf-list-type="ul">The ECU then activates or deactivates something called the Electronic Variable Orifice (EVO), which basically controls the flow of fluid in the power steering system, effecting the amount of 'boost' you get from the steering system.</li> </ul>The intent of this entire system is to provide more boosted steering at slow speeds, and less boost at higher speeds.The sensor plays a big part in ensuring predictable steering, and if it wears out that can lead to some serious problems, potentially even loss of control over steering.</blockquote>