Question about 2005 Chevrolet Trailblazer Ext

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Speedometer works but is not accurate - 2005 Chevrolet Trailblazer Ext

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  • Anonymous Nov 22, 2008

    2002 Jeep Grand Cherokee. Speedometer reads 0 when off, 9 MPH when idling, 9 MPH faster at all other speeds.

  • yadayada
    yadayada May 11, 2010

    How do you know this? Get a ticket? have you put different size tires on the truck?



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EASY to fix it yourself, or by anyone you know who is handy with tools for less than $40.

This is a known issue and a class action lawsuit for the GM SUV's is already under way, but not for passenger cars (yet). The dealers will commit criminal fraud by pretending to not know whats wrong and will charge you to replace everything else first. Then rather than replace the faulty components IN the gauge cluster they will replace the entire gauge cluster for hundreds, then charge for reprogramming the old odometer readings into the new cluster. All unnecessary. If they wont give you a firm price with a guarantee to fix the problem complete the first time, just walk away.

Go to ebay and search for user MANDIGITAL or search for "speedometer" "stepper".
You can get a set of 6 replacement stepper motors for about $40, enough to rebuild every gauge, or you can even buy just ONE for less money. This guy also has a service to replace the motors for you but you still have to take out the gauge cluster to ship it to him.

These little plastic motors (the size of a ritz er) simply position the gauge needles by computer command. A tiny bit of soldering is required to replace each one, and you just follow the included directions. I did mine in about an hour start to finish. Works perfectly now.

Heres a dashboard disassembly with pictures.

Here the process photographed from start to finish:

Finally, for those folks peeved about GM, I will say this in their defense. These components are not made by GM, and do not fail until after 4-5 years of use. GM could not predict this. They should however, start replacing these clusters as its a safety issue. Also, it is not GM that rips you off at the dealer, its the dealer. These are privately owned franchises.

NTSB will probably get the recall to happen, but it takes time. Keep logging complaints at NTSB :)


Posted on Jan 24, 2009



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