Question about 2005 Chevrolet Trailblazer Ext
My speedometer is not working and is stuck at about 30 miles per hour. what could that be?
Hello, this problem is due to a failing stepper motor. The stepper motor is the motor behind the gauge that controls the movement of the needle. When a stepper motor begins to go out it will cause the gauge needle to stick, skip around, stay at zero or max out on the gauge. The only way to fix the problem is to replace the stepper motor with a new one. While replacing one motor it is best to go ahead and replace them all as the others will go out in time as well. Your cluster will have one motor for each gauge. Here's a link to a page showing exactly how to replace a GM stepper motor and where to get the correct parts to do the job! DIY Finally How To Repair GM Instrument Cluster At Home Speedometer And...
Posted on Dec 16, 2014
Ive repaired a lot of clusters with this problem. You have a bad stepper motor. cost is 105.00
Posted on Nov 28, 2008
It very well could be the instrument cluster, i believe ive heard of this before. shifting is ok? may want to call dealer with vin# and see if there is a service bulletin on this problem. i may do a search as well
Posted on Nov 20, 2008
My 96 did the same thing. The speed sensor is and was fine -- the problem is an open circuit in the wires inside the gauge itself.
The Chilton's manual has pretty good instructions on how to replace the instrument cluster. You can buy just the speedometer gauge, or an entire instrument cluster for $100 or so on eBay. Just be sure you get a cluster that matches your model and trim line -- the LX and DX have different clusters, and of course the automatic and the 5-speed are different as well.
Do be sure to disconnect the battery before you begin the project, as there's a (slim) chance you can discharge the airbags if you don't
Posted on Oct 04, 2009
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