I have not heard of this before but I do know there is such a wide spread problem with the cluster (speedo) GM has extended warranty on several years and I expect they will add more years as time goes by.
Many of the problems I encounter have been speedo's showing a faster speed than actual, 100mph plus.
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Could be the speedometer, or the speed sensor in the transmission. Is the check engine light staying on ? If it is, you should have the computer scanned for trouble codes. You may find a code for the sensor.
sound like battery has weak or battery terminals and post need cleaning. have battery charged and checked, if battery good. alternator not charging battery. if battery over 5 years old more likely battery is bad.if battery too weak head lights wont turn on battery dead this time of year if battery old. cold weather will finish it out.
could be the thermostat if it was just stating to go bad,could also be a vacume problem not letting the door for the ac/heat close all the way for a few min.and if its really cold out like below 35,then its going to take longer to warm up,my jeep takes like around 20 min at idle to warm up.yours could be a case of over cooling in cold weather too ie(electric fans on before it warms up)that would be the thermostatic sensor.
Cold weather affects the amperage output on your battery. Chemical reactions increase with temperature and slow down with cold temps. The battery is a chemical reaction greatly affected. Some people have to replace the battery in severely cold weather. Well, at least now you know the cause. I recommend keeping a back up warm battery or purchase one of those aftermarket solar panels that hook on top of the door glass to keep your battery fresh. I think Performance Products carries it. Well, good luck.
There is a Technical Service Bulletin Out for this concern no. 07-11-2. Here are the symptoms.
A known issue exists on the instrument cluster where it is possible for the graphics applique to separate from the cluster backplate and interfere with pointer operation. The suspect vehicle build months are July, 2005 to January, 2006. Although not impossible, vehicles built outside of this time period will likely not have this issue. The most common symptom is the speedometer pointer sticking while operating in cool or cold weather and the vehicle interior is beginning to warm up after a cold start. Revised instrument clusters are now available for service that includes a fix for this concern.
Typically on a Yukon instrument cluster this is caused by failing stepper motors on the cluster's circuit board, it can be fixed though. Check out this page for more about Yukon speedometer problems and how to get it fixed - Yukon speedometer fix
This is most likely not a speed sensor problem, I see this a lot on 03-05 Cavalier instrument clusters and it's always the same. It's caused by failing stepper motors on the cluster's circuit board and it can be fixed. Check out this page for more about how to get it fixed - cavalier speedometer fix
My wife had same problem in 2005 yukon. Turn both temperture controls on dash all the way as warm as they will go, Wait about 1 or 2 mins and turn back to coolest setting. Cleared our problem right up. Do this with car running and air on.