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Discussion Starter #1
starting to hear a roaring noise from car. Its very random, only last for a short time and seems to only occur between 30 - plus 50 MPH. Dealer didn't find anything since it didn't make the noise on their test drive. Anyone have ideas or similar issue? Noise started at the 2000 mile point. 2018 Accord Hybrid Touring
 

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Tires vs Road Surfaces?

starting to hear a roaring noise from car. Its very random, only last for a short time and seems to only occur between 30 - plus 50 MPH. Dealer didn't find anything since it didn't make the noise on their test drive. Anyone have ideas or similar issue? Noise started at the 2000 mile point. 2018 Accord Hybrid Touring

Vague description - is it engine speed or acceleration related? Does it always happen between 30-50 mph? Wind noise?
Need more info.
 

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Discussion Starter #3 (Edited)
Thanks for reply.
Not wind noise it just started a month after we got the car. We're accustom to normal engine and wind noises. It could be acceleration related but its not during heavy acceleration. It does happens when speed increasing. Its not a normal engine noise. Dealer said it may be battery cooling fan under rear seat. It occurs after short periods of driving (not long dealer said could cause) so not sure that's a possibility. Dealer could not duplicate during their drive (which was only four miles). Said bring back when it can be heard.
PS first time i heard it i though a car/trunk with a bad muffler was passing me. i started looking in the mirror to see where it was at
 

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Mine is doing the same thing between 80 and 90kmh. Like if an helicopter is following you. This is coming from the gas engine.
 

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I too have a noise at about 50-65 MPH. Thought is was that I was driving on a newly paved road. Then is occurred on another older road. Sounds like a whistling noise that goes away when I slow down. Coming from the front part of the drivers side front door. As usual, when I go to the dealer the noise is not there.
 

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I’ve noted a similar situation in my touring hybrid with similar miles and at similar speeds to what you mention. It seems to occur during mild acceleration. It starts as a low sort of droning sound and sometimes increases to a peak then subsides. As mentioned by one person here, it almost sounds like possible feedback from the automatic noise cancellation system, because the sound seems to come from the side of the vehicle (speakers?) and not coming from the engine compartment or any other device (like the battery cooling fan that your dealer mentioned). I intend to mention it when I take my car in for the ‘recall’ on the back up camera.
 

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Hum from EX-L

Sparky - I have the exact issue with my 2018 EX-L. Sometimes it really resonates the cabin. The most repeatable is under light throttle at 52/53 MPH with gas engine running. Its variable but can happen while the car is holding pace, accelerating, or decelerating. No issues when running EV only. A couple weeks ago, I took it to the dealer for the camera issue and went for a ride with the shop foreman (he drove). He was much more aggressive with it than I am but managed to reproduce a marginal hum a couple times. He checked with Honda tech forum and see what he can find (nothing there), but was going to take another Hybrid for a ride to see if he could make another car do it. I have not heard back. Based on the comments here, it is not a one-off.
 

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Yes, good to know others have this situation. We have two 2018 touring hybrids. I'm going to keep an eye on the other one as well. I hope we hear from others on this matter. . . and hopefully Honda comes up with an answer and solution.
 

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I also have this problem - it sounds like someone is playing a kazoo in my driver's side view mirror. Very irritating and seems to be exacerbated by colder temperatures. 2.0T Touring, here.
 

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I also have this problem - it sounds like someone is playing a kazoo in my driver's side view mirror. Very irritating and seems to be exacerbated by colder temperatures. 2.0T Touring, here.
Exactly. I can confirm that this is coming from the gas engine. There is a recall for the battery management system. IT may fix this problem. I think that this occur at a certain rpm from the engine.
 

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I’ ve kept an eye on this the past week or two and here’s my experience.

I’ve kept the Power Flow Monitor on the center screen to determine which motors are operating, etc. The sounds seems to always occur when the power flow is in “Direct Drive” - the gas engine is running, powering the wheels, and charging the high voltage battery, AND the Power/Charge Gauge indicator is about midway or slightly above (around 10 o’clock) on the solid blue line on the “power” side of the gauge AND the speedometer is somewhere between 35 - 50 MPH. The moment the gas engine stops charging the high voltage battery, the droning sound stops almost immediately. So, possibly it has something to do with the engine running in that mode with the engine charging the high voltage battery?

Others . . . what’s your experience?
 

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I’ ve kept an eye on this the past week or two and here’s my experience.

I’ve kept the Power Flow Monitor on the center screen to determine which motors are operating, etc. The sounds seems to always occur when the power flow is in “Direct Drive” - the gas engine is running, powering the wheels, and charging the high voltage battery, AND the Power/Charge Gauge indicator is about midway or slightly above (around 10 o’clock) on the solid blue line on the “power” side of the gauge AND the speedometer is somewhere between 35 - 50 MPH. The moment the gas engine stops charging the high voltage battery, the droning sound stops almost immediately. So, possibly it has something to do with the engine running in that mode with the engine charging the high voltage battery?

Others . . . what’s your experience?
I wonder if the new recall for the battery charging software (N69) will fix this?
 

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I have not watched the info screen activity, but I can definitely say that I have the same roaring sound between 35 and 50 mph. Bought the car in September and I swear that I didn't hear this sound for the first month or so. I haven't pursued this yet with the dealer as I have been fighting with them over water leaking into the interior under the small back door window areas. At this point, they claim that they are not sure how to repair the water leak issue.
 

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Exact same issue on my Hybrid Touring. Started at about 5,000 miles and has only happened a few times. Sound is distinctly coming from the driver side of the engine and roars loudly just before the engine shuts off and switches to EV. Has only happened while slowly accelerating between 30 and 55 mph.

Watching this thread closely. It happens infrequently, so a dealer trip would be waste of time at this point.
 

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Update

A couple things:


1. It does seem the sound is more pronounced when the vehicle is first running on colder days. After warm up, it seems less pronounced.

2. I noted the noise once when the engine was running and power was being provided to the wheels and to the electric motor (just after the battery was being charged). It was a cold morning.
 

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I also have this problem - it sounds like someone is playing a kazoo in my driver's side view mirror. Very irritating and seems to be exacerbated by colder temperatures. 2.0T Touring, here.
Well, since a mirror is mentioned, you should know there is a TSB about noises from the driver side-view mirror. It is not installed correctly at the factory and the seal at the base is loose. The dealer can check for this and fix it.

You guys should really check out the Service Bulletins ("Manufacturer Communications" as NHTSA calls them these days) on the NHTSA web site. You should also read about all the complaints others have made to the NHTSA about their Accord.

I think you need to search by "2018 Accord Hybrid", and not just "'Accord" like I did for my Sport 2.0 - if you have the Hybrid model that is. They do not differentiate between trims like "Touring", EX, Base or Sport models, when it comes to Recalls and TSB's, but they do differentiate between the regular gas Accord and the Hybrid Accord because they are like 2 different models.

I think I did a search on the NHTSA for the Hybrid as well and remember reading something about a noise from the trunk where the batteries are? There were NOT many complaints on the Hybrid. You guys will have to check and if the dealer is not helping you, fill out the complaint form on the NHTSA web site. If they get enough complaints Honda will act.

Harry
 

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Discussion Starter #19
Follow up 15 Jan 2019



second trip to dealer. dealer and tech guy hear noise when i drove car (tech guy took for 80 mile overnight test and never hear. I was able to dupicate in less than 5 min on our test drive). No idea what's causing it. Tech guy said most likely they'll have to consult with honda. said they are not that familiar with the the hybrid tech.
 

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Discussion Starter #20
Follow up 15 Jan 2019

second trip to dealer. dealer and tech guy heard the noise when i drove car (tech guy took for 80 mile overnight test and never heard it. I was able to duplicate in less than 5 min on our test drive). No idea what's causing it. Tech guy said most likely they'll have to consult with honda. said they are not that familiar with the the hybrid tech.


Dave P
 
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