Buzz or humming sound coming from underneath the truck

I have seen the ABS pump module stick on causing the ABS motor to run all the time or it can be a CV axle causing the issue. Can you please shoot a quick video with your phone so we can hear the noise? that would be great. You can upload it here with your response.

I don't think it's the ABS module because the only time you hear the noise is when your close to a car or guardrail an driving if your just sitting an idling you don't hear anything. Okay, you can hear the sound but also the wind because it only happens when I'm moving and it is the ticking sound in the video not the big loud ruffled sound. An it stopped doing the sound when we turned.

I don't see the video?

It wont load up but i think i figured it out the heat shield on the muffler is broke off and just laying on top of the muffler. i moved it and it sounded like that noise .so i'm going to tape it up to see if i hear the noise anymore. thank you for all your help though.

Hello, I'm Danny.

I've attached picture steps below to help aid in the fixing of the heat shield on the exhaust muffler on your GMC truck. Let us know if this helps and get back to us if you have any further questions on this issue. We can send you all other exhaust heat shield instructions or instructions if needed. Hope this helps and thanks again for using 2CarPros.