Buick Repair Questions? Ask a Mechanic for Answers ASAP
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in the under hood fuse box are the fuse called smb/lcm and the inside fuse box the fuses called cstr/smb and hvac and in the rear fuse box called pcm/cru and see if those fuses are good and if they are do that all show 12 volts at them with the key ON ?
if that is the case you need to remove the cluster and see if the solid black wire is a good ground'if it is then the gauge cluster itself need to be sent out for repairs or replaced as there is an internal failure going on if it has it powers and the ground
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