Buzz or humming sound coming from underneath the truck

JOSH BURNZ

MEMBER
2006 GMC ENVOY
V6
4WD
AUTOMATIC
195,000 MILES

It sounds like a plastic bag is under my truck making the noise. It doesn't get louder when we turn. When we go faster it gets a little louder but not much it doesn't start doing it until we get up to speed. You cant hear it unless the windows are down. I have no idea what it could. Be any suggestions?

Monday, March 15th, 2021 AT 9:53 AM

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

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.

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Wednesday, March 17th, 2021 AT 10:45 AM

JOSH BURNZ

MEMBER
3 POSTS

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.

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Wednesday, March 17th, 2021 AT 2:29 PM

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

I don't see the video?

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Wednesday, March 17th, 2021 AT 5:09 PM

JOSH BURNZ

MEMBER
3 POSTS

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.

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Thursday, March 18th, 2021 AT 10:54 AM

DANNY L

MECHANIC
5,648 POSTS

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.

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