Wont start when key is turned - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2006 - 2009 TrailBlazer SS Tech > 06-09 SS Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs/Problems

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  #1  
Old 10-26-2018, 09:04 AM
Jasons8175 Jasons8175 is offline
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Wont start when key is turned

Hi all, hope someone can give me a hand here. I have an 08 4.2 trailblazer that is not starting consistently. What happens is when you turn the key to on and the dash lights up. Turn to start..... nothing. No clicking no cranking. Try 4 or 5 times from off to start and it might start. Or wiggle/tap the shifter a couple. Also if I shift it to neutral it might start. I think it might be the Starter but I'm not 100. Any ideas?

Thanks
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  #2  
Old 10-26-2018, 11:23 AM
astroracer astroracer is offline
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2008 GMC Envoy Denali
Carbon Black Metallic 5.3L V8 4X4
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Location: Mid-Michigan
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Sounds like the Park/Neutral switch. "Moving the shifter" points me at that. I'm not sure how these trucks incorporate that function but that is the first thing that comes to mind.
Mark
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  #3  
Old 10-31-2018, 10:31 PM
Gunny5 Gunny5 is offline
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2002 Chevy TrailBlazer LT
4.2L I6 4X4
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Quote:
Originally Posted by Jasons8175 View Post
Hi all, hope someone can give me a hand here. I have an 08 4.2 trailblazer that is not starting consistently. What happens is when you turn the key to on and the dash lights up. Turn to start..... nothing. No clicking no cranking. Try 4 or 5 times from off to start and it might start. Or wiggle/tap the shifter a couple. Also if I shift it to neutral it might start. I think it might be the Starter but I'm not 100. Any ideas?

Thanks
Easiest way to test PNP is to remove starter relay and run a jumper wire between the two terminals on the right when facing the fuse box from the left fender. Plug the relay back in to hold it in place. If it starts your problem is the PNP not sending power to the relay.
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