Re: all of a sudden my speedometer started showing the...
The stepper motor needs to be replaced on the instrument cluster. It is a simple procedure to fix. Just need to have some knowledge with Soldering Irons. Anyway, the part itself costs 10$ and easily found on ebay. Here is a website on the step by step procedure http://forums.trailvoy.com/showthread.php?t=48886
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GOOD discriptoin but its tough to say .
Your not getting codes sometimes you don't if its not that big of a problem YET.
But it sounds like you may be heading for one.
May best guess is their is an internal valve that isn't working correctly or mabey a clogged filter .But it sounds like it can be fixed with out to much expence if you do it now
Take it to a transmission shop before its to late
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.