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2007 chevy trailblazer_lt
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When the car is started and in park, all the dash board lights turn on (check engine, air bag, abs, brake, gas light). At the same time, all the gauges drop to zero, its as if the car were to be completely off even though its running.
 

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When the car is started and in park, all the dash board lights turn on (check engine, air bag, abs, brake, gas light). At the same time, all the gauges drop to zero, its as if the car were to be completely off even though its running.
Might have to change out the computer board. It happened to my 2004.
 

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I would suggest the ignition switch first, my 2004 XUV did this weird stuff too and sometimes it would just die going down the road. Changed the switch in the steering column, problem solved!
 
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