Tip & How-To about 2004 GMC Envoy
This is a common problem with an easy fix. If you are experiencing weird behavior from the instrument cluster it quite possibly is caused by corrosion on the circuit board on the back on the instrument cluster. To fix this you need to remove the instrument cluster. Refer to YouTube for this there are lots of videos shopping this, This step is much easier than it sounds, there are 4 screws and one plug. Inspect the circuit board you should see about a dozen places that have a dusty/crusty appearance (see the attached image). Clean the corrosion using isopropyl alcohol and a cotton swabs. Reinstall the cluster and your good to go.
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