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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

2008 Trailblazer No Crank or Start

  • Primetimeups
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3 years 2 months ago - 3 years 1 month ago #57603 by Primetimeups
2008 Trailblazer No Crank or Start was created by Primetimeups
Hi, I have a no crank no start on a 08 Trailblazer. It will start jumping at the relay (87 to 30) but then shuts back off with the key on in run. But I found that the pink wire(Coming from the ignition switch) has constant voltage to it, low voltage but then when I crank the vehicle it gets very bright (PINK WIRE) but it never sends power or ground to 85 to start and the instrument cluster stays on like you left the key on then have I have to disconnect battery then its fine until you try to crank it again or just turn the key on. Thanks
Last edit: 3 years 1 month ago by Primetimeups. Reason: Forgot specific area I'm referring to.

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  • ScannerDanner
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3 years 1 month ago #57719 by ScannerDanner
Replied by ScannerDanner on topic 2008 Trailblazer No Crank or Start
Step 1 is to do a full system scan on all modules. If the cluster is staying lit up with they key off, you'd think you'd have some trouble codes to give you direction
Don't be a parts changer!

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  • Primetimeups
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3 years 1 month ago #57752 by Primetimeups
Replied by Primetimeups on topic 2008 Trailblazer No Crank or Start
I should also mention it won't communicate with my hand held scanner either I thought because of this Pink wire having current in it. Thanks.

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  • Chad
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3 years 1 month ago #57764 by Chad
Replied by Chad on topic 2008 Trailblazer No Crank or Start
Here is a starting circuit diagram.



What does the security light do, when you try to start?
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)

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