Sometimes reads 30 55 45 100 etc while stopped. Can get it back to zero after a few start/stops of the engine, only to have it occur again sometimes after a few days, sometimes longer. Speedo in my edge/attitude reads propper MPH, so I dont think its the speed sensor. Possibly a bad gauge cluster? Is this common? Truck is an 04 with 33k. Thanks.

An 04 with less than 36,000 miles the dealer will replace the instrument cluster under warranty

It appears to be common on many GM trucks from what the dealer told me when mine went out. Be prepared to wait for one to be shipped in.

Tom Cobb