Two problems related to brake abs warning light have been reported for the 2004 Chevrolet Avalanche. The most recently reported issues are listed below.
Upon start up of the truck, the abs light stayed illuminated and started chiming at me. Everytime I start the truck this happens. I had my brakes inspected and they were fine. I currently do not have abs. I took the truck to a mechanic this last week and had it looked into. It is a known problem with the chevy Avalanche and they informed me that there is a part for this problem but it is on indefinite backorder. What and how does that happen? the abs system is throwing fault codes stopping it from working properly but there is not a part to replace it. Per chevy!.
2004 Chevrolet Avalanche 2wd had not been driven in 10 days, no prior problems noted. Drove vehicle, noticed abs light was on, parked vehicle, turned ignition off, heard loud humming noise coming from under vehicle. Traced noise to abs unit mounted under drivers side floor board, had to disconnect battery to stop noise, when battery is connected noise immediately starts.