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
48,363 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?

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

-1

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.

Was this

answer

helpful?

Yes

No

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

KEN L

MASTER CERTIFIED MECHANIC
48,363 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.

Was this

answer

helpful?

Yes

No

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.

Was this

answer

helpful?

Yes

No

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

KEN L

MASTER CERTIFIED MECHANIC
48,363 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.

Images (Click to make bigger)