What does it mean when the sevice system stability message comes on? on 2007 Chevrolet Avalanche

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I did buy the truck from the auction but, so far have everything down but the service sys stab, its been on all this time.
(1) Answer
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you will need to have someone run a diagnostic on this system to determine what codes are present. there are local
shops that have GM compatible software and the diagnosis
won't cost a lot.