Your problem may be a bad ignition lock switch it is a common problem usually caused by worn ignition keys. I would get a new key and see if that don't solve your problem. If that don't work then you need to replace the lock itself they have a security feature built in them that won't allow the car to start unless the proper key is installed (sometimes a new key works) this prevent thieves from taking your car by using a screwdriver or by hot wiring ...This security feature is in the lock itself not in the key GM did put it in the key but not for your vehicle
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