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Q: warning lights stay on on 2004 Chevrolet Trailblazer

warning lights come on checked with code reader and got no codes
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lately its been the ABS, airbag, and Reduced Engin Power lights but on occasion all lights are on. The other day while the truck was running i opened the tailgate, after closing the tailgate i noticed that the gate Ajar light staied on eventhough the interior lights tuned off. its got me confused. even when lights were on i noticed no problems and got no codes on the code reader
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