What is buzzing sound in 2002 Chevrolet Tahoe anti lock brake system?

Answer 1

If it only makes the sound when almost to a stop there is a ABS wheel speed sensor dropping off and activating, If it buzzs all the time the power and ground wires corrode at ABS pump motor making it constantly run, you can pull the ABS fuse in the underhood fuse block and if the noise stops you will have to replace the pump motor. Hope this helps!

I took my 2000 Chevy Tahoe to the repair shop because of the abs light that come on last week and it haded that buzzing sound under the chassis on the driver side all the time even with the ignition off, and the mechanic found a bad ELECTRONIC BRAKE CONTROL MODULE (EBCM) that kept the pump motor running, also he suggested to replace the brake pressure modulation valve (BPMV) when i called the dealership to order that part they mentioned, that they have a "few" in stock because a lot of people are having to replace that part, so if there is a lot of people replacing the EBCM to stop that buzzing sound at the punp motor it maybe the EBCM that is kepping the pump to stay on, working at all time. And searching thru the internet about some info on this matter I found this comment at a website;

I have a '2002 model Avalanche Z66 and the ABS light recently came on. A motor or module kept running even after the ignition was turned off. The only way to stop the running motor was to disconnect the battery or remove the fuse. I have found out that the problem is a defective EBCM electronic brake control module. According to three dealers these are being replaced regularly but if your vehicle is out of warranty your on your own. GMC and Chevy know the part is defective but for some reason $$ don't want to do the right thing and recall them.

Thomas.

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