My speedometer registers from 50 to 100mph at idle and continues on up as
the vehicle
starts moving. Is this an expensive fix? Any ideas on what is causing this?

Thanks,

Mo

" Mo Man" <mo_man (AT) charter (DOT) net> wrote

This is the very common stepper motor failure endemic to virtually all full
size GM/Chev/Cadillac SUV's and trucks from the 03-04 model year. Cluster
replacement is the cure. There is a special extended warranty replacement
for the cluster for 7 years/ 70,000 miles on all '03-04 units. My '04
Avalanche had it's replaced early last year free of charge. Your dealer will
know this. I got a letter from GM Canada.
http://www.gm-trucks.com/forums/index.php?showtopic=70134

" Mo Man" <mo_man (AT) charter (DOT) net> wrote

expensive. Simply replace the stepper motor. Should be able to find new ones
on ebay for $5-10. Easy to replace and instructions are easily found on the
net. Make sure you get the revised stepper or you will have the same problem
in the future. Your old stepper should be X15 168. Do a eBay search for X25
168, the revised motor. I would change all the stepper motors to the new
style while I was at it, sooner or later the rest will fail.

Here is a example of a quick search
http://cgi.ebay.com/ebaymotors/6-03-04-05-CHEVY-TAHOE-X25-168-CLUSTER-STEPPER-MOTORS_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c66Q 3a2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318QQ_trksidZp3286 Q2ec0Q2em14QQhashZitem350125166326QQitemZ350125166 326QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

Since this is 100% covered by GM warranty up to 7 years/70,000 miles and
dealers will do the job past that point on a goodwill program, pulling the
cluster yourself and replacing the stepper motor yourself hardly seems
necessary.

"Augustus" <no_one (AT) no_where (DOT) net> wrote

the OP's vehicle is covered under warranty of course get it fixed at the
dealer but if not DON"T buy a new cluster.