Speedo and Hypertech?(not the bathing suit)

[mrmayhem]

Sounds to me like the speedo stepper motor is on the way out. My 03 Avalanche (same cluster) had that prob.. the speedo would be a little off.. then as time went on.. it would jump around.. and sometimes read 0. After a restart it would work fine for a while. I thought 'old school' and figured something with a loose speedo cable.. but there are no more cables! all electronic.. I was out of warranty and dealer said something about 'stepper' motor (little electronic thingy in there).