2005 denali speedometer runs at 120mph sitting still

I'm pretty sure that there is a video on you tube on how to reset GM speedometers. Give it a shot.

I suspect that your sender is malfunctioning. Todays speedometers and RPM is sent from a sensor/sender near the drive shaft. A magnet on the drive shaft is sensed and the revolutions are converted to RPM and speed.

For information see:

http://wiki.answers.com/Q/Speedometer_on_2003_Yukon_XL_doesn%27t_work_most_of_the_time_is_this_a_common_problem_how_much_to_fix_it

Try giving the gauge pod a solid hit with your hand. This may jolt the needle back.

Otherwise,

• remove the gauge pod.
• remove the front clear panel from the pod.
• move the needle back the zero position.
• reassemble.

See if the speedometer now works.


SD

Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Silverado instrument cluster repair
Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Sierra instrument cluster repair

The Chevy instrument panels had problems with the gauges functioning. Mine says I am always doing 120mph, for the past 80,000 miles. See your dealer for a replacement. It wasn't recalled, but there was a class action suit for some of the production years which might cover replacement.

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you need to tighten the cable that comes from the odometer to the drivetrain ... they sometimes become loose from vibration... this should fix it...



good luck

Yes there is a recall for the instrument cluster gauges not working properly or sticking.Call your dealer and they will ask for your vehicle identification number.What they do is put this number in there computer and they will tell you if you have any open recalls on your vehicle.If you have less than 70k miles this will cost you nothing.But if it is over 70k then you will get the cluster free but have to pay for labor.The recall number is 07187C.Good luck.

The 04-05 GM truck have a special policy for the speedos. if you have less than i think 70k, your local dealer should replace if for free. Double check this. If not you will have to pay for a new cluster, it runs about 450 or so.

It's the step motors inside the cluster that control the gauges . From 2003 to 2006 GM had bad step motors . You need a new cluster or you can buy a kit off ebay or amazon
How to repair GM Instrument Cluster Speedometer Gauge Stepper

I had the same problem with my 2004 yukon. It seems all the gauges in the insturment cluster are known to go bad from 2003-2006 in GMC and Chevys. The deaerships are trying to sell you a new instrument cluster which is pretty costly if your warrenty is up. I repaired the circuit board on my insturment cluster myself and everything is working fine now. Since hearing abouth this problem I have started repairing the insturment cluster as a side business. If your vehicle is out of warrenty and your intersted shoot me an e-mail ([email protected]).