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Discussion Starter · #1 ·
I've had my 2016 LT, which I bought used, for about three months. I've put over 6,000 miles on it, and love it. Now has about 23,000 miles on the clock.

I'm starting to notice two issues, both of which I will have dealer investigate, but neither of which I've seen any info on these forums that seems to be relevant:

1. A subtle, reverberating, whistling sound coming from the front left of the vehicle, but only at certain speeds, and only under certain load conditions (foot on accelerator, level or going uphill, etc). If I take my foot off the accelerator to coast, or if I start downhill, or even if I change speeds by 1 mph, it can disappear instantly. Below about 52-53 mph, or above 60-61 mph, it goes away instantly. It's not very loud (turn up the radio to 20-25 and you can't hear it anymore), but it's very distinct. Makes me think of a small plastic fan blade spinning, but not properly lubricated (probably because the cabin air fan in my old Saturn Ion made a similar sound on speeds 3 or 4). But this is clearly drivetrain related. And it's definitely there in electric mode, but I'm not sure honestly if it's still there in gas mode.

2. Every once in a while, the audio system will sound as if one of the speakers suddenly stopped working, or perhaps the tone settings changed (as if the treble were turned way down). I've turned off the auto volume adjust to eliminate that variable, and I've adjusted audio settings to only one speaker at a time, and I never been able to pinpoint which speaker it might be, if that's what it is. If it was a loose wire I would expect to hear a crackling/popping sound, but I don't. It's very intermittent, but also very annoying when it does happen. I can't determine any consistency in the circumstances that cause it, and I don't see this one being easy for the dealer to replicate or diagnose.

Any thoughts?
 

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1. A subtle, reverberating, whistling sound coming from the front left of the vehicle, but only at certain speeds, and only under certain load conditions (foot on accelerator, level or going uphill, etc). If I take my foot off the accelerator to coast, or if I start downhill, or even if I change speeds by 1 mph, it can disappear instantly. Below about 52-53 mph, or above 60-61 mph, it goes away instantly. It's not very loud (turn up the radio to 20-25 and you can't hear it anymore), but it's very distinct. Makes me think of a small plastic fan blade spinning, but not properly lubricated (probably because the cabin air fan in my old Saturn Ion made a similar sound on speeds 3 or 4). But this is clearly drivetrain related. And it's definitely there in electric mode, but I'm not sure honestly if it's still there in gas mode.
This could just be the HV inverter. I can definitely hear high pitch whining sounds under high electric load; that's normal for a large motor inverter. Of course, if it's as loud as you make it sound, it could be bearings on the motor starting to go out. It could also just be that there's a certain frequency where it reverberates through the body of the vehicle.
 

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Any chance you can record using a good phone the whistling while hit happens? I say phone cause they typically have better mic then a dash cam. A camcorder also works well.

One person's whistling is another person's fan blade sound.

I typically drive cruise control but use my foot to accelerate as needed. I typically cruise 55 at light traffic and frequently push the accelerator to speed up to 65 to close distance with car in front of me. I accelerate gradually (keeping the green leaf one "bar" away from neutral) and don't recall hearing anything out of the ordinary. I've been listening and gathering info (road, speed, weather, speed, incline) for my own noise issue (OnStar header console area vibrates) and so I've been keeping my ear keen for any weird sounds. Haven't heard any whistling yet.

I do hear the HV inverter as I accelerate or if I engage significant regen (20kW+), though.
 

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Discussion Starter · #4 ·
I'll record it on my phone and try to post it. I'm pretty sure this is not the bearing issue (it's not a harsh, circular saw type sound as I've heard the bearing issue described) and I also do hear the whine of the inverter under heavy regen, which sounds like I would expect it to, but this is a completely different sound. It wasn't there for the first month or two that I owned the car, and because it comes and goes depending on speed and load condition, it is very noticeable. My wife picked up on it almost immediately the first time she rode with me after it started occurring.
 
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