Rear steerig - servicing on 2003 GMC Sierra Denali

When the rear streering is engaged electricly, it goes into gear but a light comes on that says;"Service".
The steering works for that one time and then disconnects
or goes out of gear and back to two wheel streering.
How do I service or take care of this problem myself?

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1 answer
Check the wiring connections for the Quadsteer. The service light came on, on my Quadsteer, and the connector simply wasn't plugged in all the way from the factory.