Question about 2004 Chevrolet TrailBlazer

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Both speedometer & tachometer not working, both reading wrong.

2004 Chevy Trailblazer, 72,500 miles. 1st the tachometer would not return to zero with engine turned off, then start reading eratic with engine running at highway speeds , now reads all the way to the right. Now speedometer is doing the very same thing that the techometer did. At this time, speedometer is ready 120 MPH . my speedometer is messing up. it is showing the wrong speed and sometimes freezes

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There was a recent class action law suit settled with GM for this exact problem. You can google gm speedometer lawsuit and get lots of information. Unforutunately for most people I think the warranty was limited to 7 years and 70,000 miles. Which isn't a lot of miles for most people.

If you car isn't covered by the warranty there is a way to "reset" the speedometer.

You can turn the ignition slowly like you are going to start the engine. There is a very small "dead" space where you will see your guage lights go off.

What you want to do is cycle the ignition switch from off to that dead space. Each time you do it your stuck speedometer will move towards zero about 10 mph. So if its stuck on 40 you will have to cycle it at least 4 times.

At first you will probably actually hit the ignition and the engine will try to start.....just release it and try it again.

I know this because I have a 04 avalanche with 80,0000 miles and it has this problem about twice a month.

Posted on Jul 07, 2009

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Had the similar problem with my 2005 Silverado. Instrument Cluster ribbon board replaced. @ 55K Miles. GM did it at no cost to me. Here are a couple links that might help you research http://drspeedometer.com/silverado-i...cluster-recall http://www.gmgaugerepair.com

Posted on Feb 13, 2015

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This is a pretty common issue for Trailblazers to have. Here's a link with more information about these GM gauge problems. And where you can purchase replacement parts on Amazon if you are a DIYer.
How To Repair My Instrument Cluster

Posted on Dec 01, 2014

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Posted on Jan 02, 2017

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SOURCE: Both speedometer & tachometer not working, both reading wrong.

"The Fix" works...I would have not believed it untill I did it.... Start the car in reverse and about 5 times later it reset the speedometer back to zero.....wow!

Posted on Jun 27, 2009

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JAMESFWALKERJR2006@YAHOO.COM

Aug 28, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

2004 trailblazer


Check fuse, then sensor wires on transmission and magneto!!! maybe dirty or unplugged,possibly unpluuged from cab to firewall ? Good luck hope this helps!!!!

Jun 21, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

2004 Trailblazer tachometer problem


On the 03-06 Trailblazer instrument clusters this is a common problem. It's caused by a failing stepper motor on the cluster's circuit board and can be repaired. Check out this page for more about how to get it fixed and other common cluster problems with the Trailblazers - Trailblazer tachometer broken

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5 Answers

Both speedometer & tachometer not working, both reading wrong.


"The Fix" works...I would have not believed it untill I did it.... Start the car in reverse and about 5 times later it reset the speedometer back to zero.....wow!

Mar 25, 2009 | 2004 Chevrolet TrailBlazer

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