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Q: Why doesnt my truck crank when i turn the key every so often? on 2004 Chevrolet Trailblazer

Sometimes I turn the key and it doesnt even crank just moves forward. I just wait about 15 minutes and then i try it again and it works. Could this be a Security problem? Help!
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I dont think it has anything to do with the battery because i dont mess with it, and just after 15 minutes or so it will crank back up. usually when its the battery it will at least crank and make the noise, with this, the key just goes forward but no noise, just all the lights turn on, also i dont have to jump it.
It may not be a bad battery, but globalhelper also said that it could be a loose cable or connection. This could very well be. There was a common problem found from the factory where the positive battery bolt was cross threaded during installation (or this could happen in the field during battery replacement). Disconnect both cables at the battery and check the bolts/threads. There was also a common concern (which we saw a lot of) where the Ignition Switch has been indexed wrong from the factory or during repairs in the field. You asked about the Security System; does the Security message or light come on? Are there codes in the PCM or BCM? Vehicle Cranking is what gets disabled by the Security System. You will need a scanner (not code reader) to find out what codes (if any) are stored, and also to monitor the VTD fuel disable, Crank request signal, and starter relay command signal when the problem is happening. Give me more info.
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