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 want to do the repair yourself.
Trailblazer Speedometer
For
speedometer problem click the link below :---
How to trouble shoot speedometer?
http://schematicsdiagram.blogspot.com/2011/06/speedometer-not-working.html
-----------
speedometer not working?
http://technoanswers.blogspot.com/2012/01/1996-fiat-bravo-speedometer-not-working.html
---------
Speedometer runs backward?
http://technoanswers.blogspot.com/2012/01/speedometer-runs-backward.html
----------
Warning lights on and
speedometer died?
http://howtobyme.blogspot.com/2011/08/warning-lights-on-and-speedometer-died.html
---------
ABS &
Brake lights warning indicator steady on dash and speedometer not working?
http://howtobyme.blogspot.com/2011/11/abs-brake-lights-warning-indicator.html
--------
Odometer works properly but
speedometer works intermittently?
http://technoanswers.blogspot.com/2012/01/odometer-works-properly-but-speedometer.html
----------
speedometer
is jumping?
http://schematicsdiagram.blogspot.com/2012/01/isuzu-rodeo-speedometer-is-jumping.html
-----------
This will help.
Thanks.
For
speedometer related issues, the help links are provided below. Click the link
below to go through its details: ----
How to trouble shoot speedometer?
http://schematicsdiagram.blogspot.com/2011/06/speedometer-not-working.html
-----------
why speedometer not working?
http://technoanswers.blogspot.com/2012/01/1996-fiat-bravo-speedometer-not-working.html
------------
Speedometer works but odometer not working?
http://technoanswers.blogspot.in/2012/01/speedometer-works-but-odometer-not.html
-----------
Speedometer runs backward?
http://technoanswers.blogspot.com/2012/01/speedometer-runs-backward.html
---------
Warning lights on and
speedometer died?
http://howtobyme.blogspot.com/2011/08/warning-lights-on-and-speedometer-died.html
--------------
ABS & Brake lights
warning indicator steady on dash and speedometer not working?
http://howtobyme.blogspot.com/2011/11/abs-brake-lights-warning-indicator.html
-----------
Vehicles Cluster panel Not
reading Miles?
http://schematicsdiagram.blogspot.com/2011/12/vehicles-cluster-panel-not-reading.html
---------
Odometer works properly but speedometer works
intermittently?
http://technoanswers.blogspot.com/2012/01/odometer-works-properly-but-speedometer.html
---------------
How odometer works in cars?
http://technoanswers.blogspot.com/2011/11/how-odometer-works-in-cars.html
--------------
Speedometer not working on Ford?
http://repairhelpcenter.blogspot.in/2012/02/speedometer-not-working-on-1993-ford.html
--------
This will help.
Thanks
How to trouble shoot
speedometer? http://technoanswers.blogspot.com/2012/01/speedometer-runs-backward.html ----------
http://schematicsdiagram.blogspot.com/2011/06/speedometer-not-working.html
-----------speedometer not working?
http://technoanswers.blogspot.com/2012/01/1996-fiat-bravo-speedometer-not-working.html
---------Speedometer runs backward?
Warning lights on and
speedometer died?
http://howtobyme.blogspot.com/2011/08/warning-lights-on-and-speedometer-died.html
--------Odometer works properly but speedometer works
intermittently?
http://technoanswers.blogspot.com/2012/01/odometer-works-properly-but-speedometer.html
----------speedometer is jumping?
http://schematicsdiagram.blogspot.com/2012/01/isuzu-rodeo-speedometer-is-jumping.html
-----------This will help.Thanks.
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