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I have a 2015 Colorado and have intermittently been getting the “Service Theft Deterrent System” since I got the truck (new). Has no impact whatsoever, just a pain when I try to sell one day. I also get an intermittent Check Engine light, for which my mechanic unable to determine cause. It comes and goes, just like the Theft warning. And sometimes my radio/speakers won’t work. Mystery ailments that come and go.
 

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I also have a 2015 Colorado and I have some of these problems too. I get “ Service theft deterrent system“ “ Service power steering“ Every once in a while and I don’t understand why. And I think once or twice my speakers wouldn’t play any sound but the radio worked
 
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