Speedometer stopped working 2004 Rendezvous - 2004 Buick Rendezvous

SOURCE: 2004 Buick Rendezvous, speedometer fluctuations

Turns out this is a common problem for the Rendezvous.
I took it to a mechanic and after he tested to see if all the speed sensors were working with his handheld computer reader, (because there is no speedometer cable anymore) He reset the needle by turning the key about 25 times as far as possible without starting the vehicle. The speedometer needle came back a bit each key turn till it reached zero. It's been working fine since.

SOURCE: How to replace cluster panel/light for speedometer

the panel has trim around it youll have to take the trim off pry under it with a straight edge or flat screwdriver this will give you access to the screws that keep the cluster in place undo the screws usually phillips head and pull the panel out on the back side of the panel you will see tabs protruding from the panel thise is where your bulbs are housed theres one for each bulb locate the one that has your blown bulb in it turn counter clockwise and pull up this will release the holder pull the bulb out push the new one in and reverse the process to reinstall.

SOURCE: The speedometer on my 2004

It could be a bad connection in the wires between the speed sensor and the Engine Control Module (ECM). Is the ECM setting a speed sensor code? It could also be a bad Instrument Panel Cluster (IPC) module. Are there any codes in the IPC? It could be a problem with the data line between the ECM and the IPC, in which case you will be getting "U-codes" out of your ECM. (U-codes indicate communication problems between the various modules in your car) A good scan of you vehicle's computer systems would be the best place to start.