One problem related to battery cable has been reported for the 2004 Chevrolet Avalanche. The most recently reported issues are listed below.
I own a 2004 Chevrolet Avalanche with 46655 miles and on or about October 31, 2006 the speedometer began acting erratic. The speedometer registered past 120 mph and locked while driving on I 95 at 70 mph. I know the speed because I was following a family member and was talking on the cell phone at the time. When I arrived at my destination the speedometer remained locked past 120 until I unhooked and re-hooked the positive battery cable at which time it returned to 0. Speedometer worked for about a month then did the same thing, I subsequently repeated the battery procedure until I talked to my local Chevrolet dealer who without even looking at the vehicle said that I needed to replace the gauge cluster and that it was a common problem. When I returned to the big country Chevrolet in hemingway, SC and they ran the diagnostics it was determined that the cluster needed to be replaced for $380. After researching this problem on the internet I found that this a very prevalent complaint that Chevrolet is not addressing but is charging consumers $375-1000 to correct but is not taking any responsibility for installing a substandard speedometer cluster. I have read all about the class action suits lawyers are advertising but I am not interested in making money for lawyers. I am a retired police officer and paid, what I believed, is a lot of money for my vehicle and I'm not sure who to turn to other than your agency. I would like to know if there is any ongoing investigation into this problem or anything being done to force Chevrolet into taking responsibility for this dangerous situation. I look forward to your response.