While driving there is a grrrrr sound under the hood?

THOMAS KEEGAN

MEMBER
2016 HONDA PILOT
3.5L
6 CYL
4WD
AUTOMATIC
116,000 MILES

When cruising along at any speed it makes that sound grrrr for a split second, it doesn’t do it when I accelerate or coasting. It has been doing it for 6 months. I had a diagnostic test negative. It runs good and the transmission shifts smoothly.

Saturday, October 14th, 2023 AT 9:24 AM

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,690 POSTS

Can I ask if the noise happens when the A/C is on? Is the noise coming from the front or rear of the vehicle?

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Saturday, October 14th, 2023 AT 12:12 PM

THOMAS KEEGAN

MEMBER
3 POSTS

No, it doesn’t. It’s like a ummmm sound very low, you can hear it and feel it. You would think something would pop up on the dashboard, like maybe a sensor, but it doesn’t. Like I said it only does it when you’re just sitting back cruising along. The vehicle runs well and shifts normally.

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Saturday, October 14th, 2023 AT 5:06 PM

KEN L

MASTER CERTIFIED MECHANIC
47,690 POSTS

Does it seem like it goes with the road speed? Also does the noise change when you steering slightly to the right or left? I am thinking it is a bearing hub. Can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response.

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Sunday, October 15th, 2023 AT 9:45 AM

THOMAS KEEGAN

MEMBER
3 POSTS

It just makes the noise when I’m just cruising along, you can hear it under the hood. It’s like a Rrrrrrrr sound that lasts a split second.

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Sunday, October 15th, 2023 AT 11:11 AM

KEN L

MASTER CERTIFIED MECHANIC
47,690 POSTS

It sounds like you have a serpentine belt idler bearing or belt tensioner that needs to be replaced, I would install a new serpentine belt as well. I would remove the belt and spin the pulleys to see if one of them feels rough or makes noise. Check out the images (below). Please let us know what happens.

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