The tachometer is not reading accurately. When the engine starts, it's pointer unpredictably moves and sometimes extremely to the last number and eventually drops to zero.
SOURCE: Tachometer fails to work all of the time
You will need to remove the tach and have it repaired by a factory authorized service center, don't go through the dealer, they will 2X the price.
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!
SOURCE: Both speedometer & tachometer not working, both reading wrong.
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.
SOURCE: 1999 Dodge intrepid won't start sometimes
Check wires from battery to starter motor and altinator are clean and tight.If they are ok i would change the starter motor.
SOURCE: 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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