I was on my way home last night runnin bout 60 or so and my speedo jumps to 85 mph. My gps still said 60. When i got home and shut my truck of it doesnt go below 25. Is there a way to reset it? Is it time for me to just deal with a broken speedo?

Sorry no reset. The stepper motor is shot. the speedo is the first one to go.
GM was forced to extend the warranty on the cluster. I don't know the details.
I found it easier to fix it myself.

http://www.dieselplace.com/forum/showthread.php?t=374045

Much agreed, how many miles on your truck? If it's under 70k dealer can replace for nothing, if its at 80k you have to pay a little but its not too much.

116,000 figures they set the milage up perfect for them. oh well looks like i have another prodject. thanks

You must have an early build 2005! Mine is July 05 and hasn't acted up yet. Pretty much all 03-04 steppers fail early in life.

Repair is $150 includes shipping back to you (if you can live without it for 3-4 days). Fixed the same business day I get it and back in UPS heading back to you.

You must have an early build 2005! Mine is July 05 and hasn't acted up yet. Pretty much all 03-04 steppers fail early in life.

Repair is $150 includes shipping back to you (if you can live without it for 3-4 days). Fixed the same business day I get it and back in UPS heading back to you.
It actually went back to normal after a couple of days. I'm sure it will go out for good eventually but for now im just gonna hold off. All my other gauges work and i have a gps for speed.