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I have a 2007 with 155K miles on it. It makes a loud whirring noise that gets louder when you accelerate. Based on this my mechanic replaced both front wheel bearings and hubs. It was still making the noise so he replaced the intermediate shaft on the front passenger side.

Still making the noise so now he thinks it's coming from the transmission. He said it could be a carrier bearing in the differential (or a pump). Only way to fix is rebuild or replace the transmission, according to him.

Wondering if anyone had this issue and how you resolved it?
 

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I have a 2007 with 155K miles on it. It makes a loud whirring noise that gets louder when you accelerate. Based on this my mechanic replaced both front wheel bearings and hubs. It was still making the noise so he replaced the intermediate shaft on the front passenger side.

Still making the noise so now he thinks it's coming from the transmission. He said it could be a carrier bearing in the differential (or a pump). Only way to fix is rebuild or replace the transmission, according to him.

Wondering if anyone had this issue and how you resolved it?
Sounds like your mechanic is on an expensive exploration of your Pilot, financed by you. Might be time to bring the car to a different shop for diagnosis.
Is your Pilot 2wd or 4wd?
 

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If it matches RPMs as well as acceleration (try it in park or neutral), think alternator, and don't wait until it dies on you.

https://www.piloteers.org/threads/alternator-issue.27367/page-2#post-1193321

 

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If it matches RPMs as well as acceleration (try it in park or neutral), think alternator, and don't wait until it dies on you.

https://www.piloteers.org/threads/alternator-issue.27367/page-2#post-1193321

It does not make the noise in Park, I checked that.
 

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I don't think it is coming from the rear, you can hear it coming from the front.
It's not too difficult to check the fluid, if you have tools and basic DIY skills. Do a search on this forum or on Google for VTM4 fluid check. A noisy VTM4 rear end can transmit the sound up front thru the driveshaft. It's a possibility.
 

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It's not too difficult to check the fluid, if you have tools and basic DIY skills. Do a search on this forum or on Google for VTM4 fluid check. A noisy VTM4 rear end can transmit the sound up front thru the driveshaft. It's a possibility.
And while you're at it, may as well check/change front transfer case oil, if it's a 4WD. Has it ever been changed?

 

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Discussion Starter #11
And while you're at it, may as well check/change front transfer case oil, if it's a 4WD. Has it ever been changed?

Thanks for the info. Mine has push button 4WD so I'm assuming the rear differential only gets engaged in 4WD?

I've never changed the front transfer case oil. Do you need to check these fluids when the vehicle is warm?
 

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Thanks for the info. Mine has push button 4WD so I'm assuming the rear differential only gets engaged in 4WD?

I've never changed the front transfer case oil. Do you need to check these fluids when the vehicle is warm?
Honda VTM4 is automatic, proportional, computer controlled, and funtions without pushing the button. It typically is active while accelerating at speeds below 18 mph. The button is for when you are stuck, and forces the rear diff to maximum engagement at low speed, so you can get out of the ditch or snowbank.

In short, your sound during acceleration could easily be a noisy rear VTM4 unit.

Google is your friend for all details on how to change fluids. Lots of good youtube videos out there.

Didn't your mechanic even look at the front transfer case oil before he tried to sell you a transmission job?

And how about the transmission fluid? Have you or your mechanic checked the level and condition (color) of the fluid? If your transmission is shifting well, I would really question your mechanic's statement that the tranny pump is bad, or that the differential bearings are bad. Your Pilot only has 155k miles. Have an ATF drain and refill service before you even think about a new transmission. Maybe have it done by someone else than your current mech.
 

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Discussion Starter #14 (Edited)
Honda VTM4 is automatic, proportional, computer controlled, and funtions without pushing the button. It typically is active while accelerating at speeds below 18 mph. The button is for when you are stuck, and forces the rear diff to maximum engagement at low speed, so you can get out of the ditch or snowbank.

In short, your sound during acceleration could easily be a noisy rear VTM4 unit.

Google is your friend for all details on how to change fluids. Lots of good youtube videos out there.

Didn't your mechanic even look at the front transfer case oil before he tried to sell you a transmission job?
The noise is definitely at speeds above 18 mph. I don't know if he checked the transfer case oil, I'll ask him. He has changed the transmission fluid recently.
 

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Have you opened the hood and had someone press the gas pedal to figure out where the noise is coming from?
You can eliminate the AC, alternator and PS pump, their serpentine belt, and tensioners, by pulling the belt off. If the noise is gone then it is one of them.

Oh, never mind - no noise in Park...

Is it a grinding noise? The rusted off dust shields on the brakes might cause intermittent or constant, frightening griding noises.
 

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Discussion Starter #16
Have you opened the hood and had someone press the gas pedal to figure out where the noise is coming from?
You can eliminate the AC, alternator and PS pump, their serpentine belt, and tensioners, by pulling the belt off. If the noise is gone then it is one of them.

Oh, never mind - no noise in Park...

Is it a grinding noise? The rusted off dust shields on the brakes might cause intermittent or constant, frightening griding noises.
Brakes are good.
 

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So, if the transmission is just making a noise, why would you rebuilt or replace it? I wouldn't drop that kind of money unless absolutely necessary. Best thing you can do is find another mechanic, replace all the fluid and wait until something bad happens. I have a bit of a whistling noise and sometimes a whine under 40 mph usually under acceleration. Mechanic says it's something to do with the propeller (I think?) but it doesn't affect daily driving so I just live with it.
 

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I asked my mechanic about the fluid in the front transfer case and he said while it might improve things, the noise isn't something that could be remedied by a fluid change. I'll definitely hold off on the transmission for now, no other other issues with it like slipping out of gear, ATM light, etc. My mechanic did say the same, that we could keep driving the transmission until there is an issue.
 

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I have a 2007 with 155K miles on it. It makes a loud whirring noise that gets louder when you accelerate. Based on this my mechanic replaced both front wheel bearings and hubs. It was still making the noise so he replaced the intermediate shaft on the front passenger side.

Still making the noise so now he thinks it's coming from the transmission. He said it could be a carrier bearing in the differential (or a pump). Only way to fix is rebuild or replace the transmission, according to him.

Wondering if anyone had this issue and how you resolved it?

I think you need a new mechanic. The work he has done should easily have been differentiated.

You say you have never changed transfer fluid, and I presume your rear differential fluid? Tranny fluid is due every 30,000 miles. The tranfer case and rear diff should have been done at 60K. Read and understand the owners manual!

The transfer case and/or rear diff (VTM4) are the most likely sources of your noise. It is critical thst you use Honda VTM4 fluid on the rear diff. There is no aftermarket version. I'm guessing your mechanic is not particularly Honda trained. Find someone else. New fluid will not cure the noise, the gearing has been damaged somehow, but it will reduce the noise for a while.

At 155K, if you can get by with the noise, the Pilot might go another 100K unless you tow with it.
 

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I have a 2005 with 185K and I had this noise probably at 100K. My mechanic drained the transmission (HE SAID DO NOT FLUSH JUST DRAIN) and replaced with HONDA transmission fluid (DO NOT USE ANY OTHER TRANSMISSION FLUID... ONLY HONDA). It stopped the noise until now. It started back up at around 180K. I asked a transmission specialist and he said it is possibly a bearing in the back part of the transmission. He said the only way to fix it is to replace the transmission. I may have it drained and fluid replaced again but we will see.
 
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