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I put a used computer in a 2004 trailblazer and now it won't start

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  • Cars & Trucks Master
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Chances are it doesnt recognise your old keys. they have to match to work

Posted on Jan 13, 2019

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Posted on Jan 02, 2017

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SOURCE: starter on 2004 chevy trailblazer

When my battery goes dead and the key is in the acc postion then i cant get the key out

Posted on Feb 12, 2012

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My 2004 chevy trailblazer is in park, but is stuck in reverse and now it won't start. What can it be?


ok my problem is my chevy blazer is that my reverse wont work and that even in neutral it still goes forward like its in drive any body got any suggestions

May 29, 2012 | 2004 Chevrolet TrailBlazer

1 Answer

06 trailblazer trouble with anti theft system, I think, starts right up then other times the anti theft light comes on and it won't start. can try it 2-4 hours later and it starts right up????


The first thing to do get it checked for DTC'S - diagnostic trouble codes . Not at auto zone or any other parts store , you want to have full scan of all the modules on the car. Don't know how much you know about automotive electronics , computer controlled systems etc.... Your vehicle has at least 10 modules (computers ) on board , there all talk to each other on a serial data network . C.A.N - controller area network . Or in the case of GM it has it's own . GMLAN -
How to Diagnose Controller Area Network CAN When you turn that ignition switch to start it is an input to the computer ,be it the PCM or BCM ..

Jul 01, 2017 | 2004 Chevrolet TrailBlazer

1 Answer

2004 Trailblazer - replaced blown speakers in back, now it won't start. Need to replace 2 more speakers - how can I do that without this happening again? Had to jump to get it started. How can...


This is just a guess but has happened to me before. The battery may be on the weak side and guessing you may have had the doors open for some time as well as the radio going for a while as well which could have pulled the battery down.

Jul 04, 2011 | 2004 Chevrolet TrailBlazer

2 Answers

Starter on 2004 chevy trailblazer


If you can't get the key out of the ignition, it's probably the ignition switch (where the key goes in) that is bad, not the starter. The starter is on the right side under the exhaust manifold behind the right front wheel. It's not easy to change on those unless you know what you're doing.

May 30, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

My 2004 Trailblazer fan won't run on setting one


Fan problem is the blower resistor module. Very easy to fix ,located right next to the fan under the dash behind the glove box.It has screws that hold it inside the air duct. just remove, unplug from blower motor and replace. A new one costs about 25$.

Nov 29, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

Chevy Trailblazer 2003 ran the battery down now wont idle


try changing the air filter ,i had a problem ,at ilde in drive my trailblazer would stall, changed the air filter now it's not stalling and got my power back ,there is a secondary air pump that i have to change ,
not sure were it is ? still not running perfect but it's running better .and my service light is on too.
i got it put on scope ,it's the pump .
not sure if this helps ,but i'm start to run in to problems too,i have a 2004 trailblazer.
i like to do fix things myself ,i hope i can.it's the cost if you know what i mean.

Dec 17, 2008 | 2004 Chevrolet TrailBlazer

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