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 Post subject: High whistling sound
PostPosted: Sun Aug 26, 2018 12:14 am 
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Joined: Sat Aug 25, 2018 11:53 pm
Posts: 3
I bought b250e 2014 four months ago, the mileage was over 30000 mile, I always hear a high whistling sound when accelerating, is it normal? As a safety for pedestrians? Or is there something wrong with the gear?


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 Post subject: Re: High whistling sound
PostPosted: Sun Aug 26, 2018 9:31 am 
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Joined: Thu Dec 11, 2014 9:12 am
Posts: 781
Hi AA,

At low speed, there is a noise emitted so pedestrians know we are around. With the windows up, you won't hear it. So if you hear it at 10+ mph, unless you have bionic hearing, this may be a symptom of a engine fault. You should peruse the topic about engine malfunction or search for whine or noise to find. This has been the precursor to a motor malfunction for some. The reason to read the posts here is that you will end up being more informed than the service advisor who typically knows nothing about our cars. Depending on your dealer, you should expect no one in the service ops who knows. They will hook up the car to the computer, read the coded messages and if a problem, revert to Germany.

If you bought a used, there should be a record of all safety recalls, annual battery inspections, and any prior problems. Get them to give you those too.

Good luck.

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Jeff in NYC
MB '17 B250e; MB '06 E500W; MB '81 380SL


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 Post subject: Re: High whistling sound
PostPosted: Tue Aug 28, 2018 10:56 pm 
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Joined: Sat Aug 25, 2018 11:53 pm
Posts: 3
My dealer has no idea what is going on with this car, they don’t import it at all.
I don’t know if you get what I meant with the sound I’m hearing so I recorded it as a vedio, here is a link to the vedio where you can hear the noise

https://youtu.be/ikre4zu9gVE


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 Post subject: Re: High whistling sound
PostPosted: Fri Aug 31, 2018 10:20 am 
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Joined: Mon Jul 31, 2017 8:11 pm
Posts: 4
This sounds perfectly normal. The whining sound comes from the electric motor. Just like our 2015 B class electric (~25K miles).


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 Post subject: Re: High whistling sound
PostPosted: Sat Sep 01, 2018 8:58 am 
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Joined: Thu Dec 11, 2014 9:12 am
Posts: 781
Thanks for the video. It does sound like the electric version of revving the engine. If it gets scratchy, there may be a problem with the motor.

Curious about, "my dealer does not import". You do need to schmooze your dealer so when something does come up, they don't mess around but instead consult with Germany asap.

You are welcome to peruse the topics under Technical as most questions have already enjoyed member input.

Enjoy the ride.

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Jeff in NYC
MB '17 B250e; MB '06 E500W; MB '81 380SL


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 Post subject: Re: High whistling sound
PostPosted: Sun Sep 23, 2018 9:59 am 
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Joined: Fri Mar 25, 2016 4:32 pm
Posts: 3
Mine has now done around 52,000 miles and I have become aware of the electric motor whine. I cant decide if it is more obvious than it was or I have become more sensitive to it. Pleased to say that mine sounds exactly like the video so good to hear JeffRay's comment that it sounds normal.


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