Strange humming/buzzing sound coming from somewhere???

[Hemogoblin]

I know this is going to be vague, and irritatingly unhelpful to describe, but my hope is someone may have experienced this and can help me out.
2019 Rebel, with approx 100,000 kms (or 62,000 miles).

It sounds like a humming/vibrating/buzzing noise (I would describe it more as an electronic source vs mechanical but I'm no expert) that comes on at random. I "think" it's from the back somewhere but once I swore it sounded like a fan or something from under the hood? I can hear it often when I punch the gas in traffic and as I'm slowing down, not touching anything, it's there. Also comes on when driving at steady speed. It also goes away as I slow down, and just before the truck stops, it stops (like at 5 MPH)? I just swapped on my winter rims and tires and it's still there. I have tried "shifting" the gears while it is happening and it doesn't change so it doesn't seem to be tied to the engine RPM.

I'm lost :-(

 

[kapinallinen2]

I know this is going to be vague, and irritatingly unhelpful to describe, but my hope is someone may have experienced this and can help me out.
2019 Rebel, with approx 100,000 kms (or 62,000 miles).

It sounds like a humming/vibrating/buzzing noise (I would describe it more as an electronic source vs mechanical but I'm no expert) that comes on at random. I "think" it's from the back somewhere but once I swore it sounded like a fan or something from under the hood? I can hear it often when I punch the gas in traffic and as I'm slowing down, not touching anything, it's there. Also comes on when driving at steady speed. It also goes away as I slow down, and just before the truck stops, it stops (like at 5 MPH)? I just swapped on my winter rims and tires and it's still there. I have tried "shifting" the gears while it is happening and it doesn't change so it doesn't seem to be tied to the engine RPM.

I'm lost :-(

Can you get a recording of it and post to you tube?

 

[Scram1500]

Is this a Hemi? From what you described it sounds like the ANC (Active Noise Cancelation) is malfunctioning

 

[Hemogoblin]

Is this a Hemi? From what you described it sounds like the ANC (Active Noise Cancelation) is malfunctioning

Yup, Hemi. I too was thinking that......thanks for the suggestion.

 

[Hemogoblin]

Can you get a recording of it and post to you tube?

I don't think I could record it well enough to hear. My wife didn't even know it was happening.

 

[Scram1500]

Yup, Hemi. I too was thinking that......thanks for the suggestion.

I bypassed mine over three years ago with iDatalink bCH3 due to strange noises. Head unit is base non-Nav 8.4 with Uconnect 4C

iDatalink bCH3 ANC Bypass Harness

Noise cancellation (ANC) bypass harness for select 2017-up Chrysler Pacifica and 2019-up Ram trucks without a factory amplifier

www.crutchfield.com

 

[Hemogoblin]

I bypassed mine over three years ago with iDatalink bCH3 due to strange noises. Head unit is base non-Nav 8.4 with Uconnect 4C

iDatalink bCH3 ANC Bypass Harness

Noise cancellation (ANC) bypass harness for select 2017-up Chrysler Pacifica and 2019-up Ram trucks without a factory amplifier

www.crutchfield.com

Thanks, I've never heard of such a thing. I wonder if they have one for mine, the 12" with amp......

 

[Scap]

Thanks, I've never heard of such a thing. I wonder if they have one for mine, the 12" with amp......

You can test if it is ANC by opening a window as this turns it off.

 

[Hemogoblin]

You can test if it is ANC by opening a window as this turns it off.

Great idea! I'll definitely try that the next time I hear it. The more I read about this, the more it sounds like it's the cause.

 

[Adjutant]

Great idea! I'll definitely try that the next time I hear it. The more I read about this, the more it sounds like it's the cause.

My 2021 Laramie with 77K miles just did this the other day. I thought it was an A/C fan, but it sounded more electronic. It was definitely weird. I have the active noise cancellation also. You described what I heard to a "T"

 

[Eighty]

I don't know if the 5.7L Hemi's have this, but it's worth a check (as it has come up as a source of rattling several times on the TRX forum). At the rear end of your exhaust pipes, right before the tips, do you have a small screen vent? They sometimes come loose, and rattle against the pipes.