High-pitched whirring sound modulated by engine speed

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crikey

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2019 Mazda CX-9 Signature, Machine Grey Metallic
I've only had our 2010 Mazda CX-9 GT for about a month and I'm hearing a high-pitched whirring sound emanating from the bottom of the CX-9. It sounds like an electric motor. I cannot tell if it's from the engine, transmission or the wheels. The sound changes in pitch as the engine speed increases. Has anyone experienced the same issue?
 
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I have an '07 and have the same noise. I only notice it when the windows are down and I drive through an area with side walls. I believe it eminates from the transmission. I sort of sounds like an electric forklift. So far I have 51K on my 9.
 
Lindyrect said:
I have an '07 and have the same noise. I only notice it when the windows are down and I drive through an area with side walls. I believe it eminates from the transmission. I sort of sounds like an electric forklift. So far I have 51K on my 9.
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Thanks for your response. Have you ever pointed out the noise with the dealership you take the CX-9 for servicing?
 
Never reported it, was just waiting to see if something blew, but it has been consistent in performance even when I harsh on it on the autostrada.
 
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