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Discussion Starter · #1 ·
I have a new issue that seems to be getting worse. On acceleration from stop, the first two or three stops after starting the car, I get a very deep resonant groan, almost like a vibration, but it's not a physical vibration. Like something electrical, especially loud if the radio is on but still audible with the radio off.
 

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Discussion Starter · #3 ·
You say it is louder with the radio ON? Is the sound actually coming through the speakers at all?
At first I thought so but I turned the radio off and still heard it, just not as loud. It’s like a deep boing…
 

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Discussion Starter · #5 ·
Just a guess, but sometimes the power amp for the radio stays powered up even with the radio switched off. See if you can hear the sound coming from the power amp under the seat.
How would that explain the boing on acceleration only at the first two or three stop and goes of each trip?
 

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Discussion Starter · #7 ·
No idea. Just guessing, based on the noise being LOUDER with the radio on. Absent the radio symptom, and the noise clearing after the first couple of stops, I would look at the parking brake system. Do you use your parking brake regularly? If so, try leaving the parking brake off, (as long as you park on a relatively flat surface) and see if you get the same noise.
I never manually apply the parking brake.
 

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Discussion Starter · #8 · (Edited)
No idea. Just guessing, based on the noise being LOUDER with the radio on. Absent the radio symptom, and the noise clearing after the first couple of stops, I would look at the parking brake system. Do you use your parking brake regularly? If so, try leaving the parking brake off, (as long as you park on a relatively flat surface) and see if you get the same noise. Regardless, If it is getting worse, I suggest trying to get a recording of the noise before you bring it in for service. Good luck.
It is progressively getting louder and occurring more frequently. It seems like it's more prevalent if I'm also turning on acceleration, like pulling out into an intersection while turning. I scheduled a service visit for next week to look at this, my battery dying, and the black box behind the rearview mirror constantly opening at the slightest bump. The service writer was perplexed when I predicted none of it will be resolved...

Then my cousin tells me her 22 ICE Tucson has an issue where the accelerator doesn't disengage so the engine revs even with her foot off the gas. The service gy told her "it's not a problem". Yikes.... Right up to when she rear ends someone because the car kept accelerating on its own. I'm starting to wonder what I've done....
 

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Discussion Starter · #12 ·
That's about the time the ABS does a self test.
Temporarily pull the ABS fuses and see if it goes away.
Well that's interesting. Every time you start up from stop it self tests?
 

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Discussion Starter · #14 ·
No, it should only do it once after first starting and driving the car. Some other ideas based on other threads I’ve read:
  • Bad wheel bearings
  • Faulty transmission
  • AWD transfer case issue
People are reporting similar issues as you…noise that got louder, especially during a turn. Humming sounds. Car seems like it doesn’t want to shift out of first gear. But best bet is to have the dealer take a look at it. Hope you can get this fixed soon.
It’s more like a boing. Only lasts a second. But now it’s each start from stop.
 

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Discussion Starter · #16 ·
Do you ever use auto hold? If not, try turning on auto hold and see if you get the same noise. If it goes away or changes it in any way that may narrow it down to something with the braking system. (stuck caliper, defective brake hose, etc.)
A stuck caliper would be pretty obvious, no? Remember, this is not coming to a stop, but starting back up. I will try auto hold, or whatever it’s called. I only don’t use it because you have to manually turn it on every trip.
 

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Discussion Starter · #18 ·
Since the boing sound has increased in frequency....
Dealer item to diagnose. Let us know their opinion on the fix.
It's going in Wednesday. I don't expect to hear anything other than, "We don't hear anything wrong".
 

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Discussion Starter · #20 ·
If the caliper is not releasing completely on one side the brake pad could be dragging creating a groan or boing sound as it fully releases. Some of the Hyundai cars have a brake caliper that has sliding parts and a slight rust build up can cause the caliper to hang up and not release properly when coming off of braking as when you are starting to getting going again. If it happens only when turning left it could be a caliper on the left. If it is happening when turning right it could be a caliper on the right hand side of the car.
If it is none of these things maybe you have a gremlin or a mischievous spirit living in your car's machinery.
Turning in either direction. The car hasn’t even been wet except for touchless car washes.

My money is on gremlins…
 

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Discussion Starter · #24 ·
I can't imagine what could be making a "boing" sound either (whatever that means). I am just guessing based on what you describe as the symptoms of your problem (happens during braking, the radio volume thing, getting progressively worse, etc). Nobody knows what it is, but you seem pretty sure of what it isn't. Hopefully, the mechanics at Hyundai have better imaginations.
Does NOT happen during braking, happens accelerating FROM a stop and exacerbated when steering as when turning into an intersection from a stop. I haven't heard it at any other time, driving along, slowing, stopping, coasting, etc.

I'll be sure to let you know how the tech describes the sound....
 

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Discussion Starter · #25 ·
I can't imagine what could be making a "boing" sound either (whatever that means). I am just guessing based on what you describe as the symptoms of your problem (happens during braking, the radio volume thing, getting progressively worse, etc). Nobody knows what it is, but you seem pretty sure of what it isn't. Hopefully, the mechanics at Hyundai have better imaginations.
So, had my appointment today. It did it pretty loudly at all 5 turns from home to the dealer at which I had to stop before turning.

They found nothing (they put 18 miles on the car; I'm fairly certain it's the first time their PHEV-certified tech has actually had a chance to see and drive one since they aren't sold in my state). I offered to go over and take him for a drive but they didn't take me up on it.

When I went back I didn't say boo because first I wanted to make sure it did it before I said, "see, listen here ya go". So, of course all the way home it didn't do it. Since they had turned the a/c off, at first I wondered if it maybe was with the a/c engaged, but that didn't seem to prove out. So, I'll see how it is tomorrow.

And, with 3,600 miles on the car they covered the first oil change and filter under the Hyundai service plan and told me next free service will be at 16,000. I don't know who decides this but I've read a lot of people on here were refused a first service for free with less than 7,000 miles.
 

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Discussion Starter · #26 ·
Does NOT happen during braking, happens accelerating FROM a stop and exacerbated when steering as when turning into an intersection from a stop. I haven't heard it at any other time, driving along, slowing, stopping, coasting, etc.

I'll be sure to let you know how the tech describes the sound....
So I took the car back yesterday and the service manager went for a ride with me and heard the noise. They wanted me to bring it in today so he and the shop foreman along with the factory rep could diagnose it. They just told me it’s the rear diff coupling, which has to be ordered, but that it’s safe to drive, as I’ve got a 250 trip Friday and Monday. I’m not 100% confident a rear diff coupler issue is that safe…
I can't imagine what could be making a "boing" sound either (whatever that means). I am just guessing based on what you describe as the symptoms of your problem (happens during braking, the radio volume thing, getting progressively worse, etc). Nobody knows what it is, but you seem pretty sure of what it isn't. Hopefully, the mechanics at Hyundai have better imaginations.
So I took the car back yesterday and the service manager went for a ride with me and heard the noise. They wanted me to bring it in today so he and the shop foreman along with the factory rep could diagnose it. They just told me it’s the rear diff coupling, which has to be ordered, but that it’s safe to drive, as I’ve got a 250 trip Friday and Monday. I’m not 100% confident a rear diff coupler issue is that safe…
 

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Discussion Starter · #27 ·
So I took the car back yesterday and the service manager went for a ride with me and heard the noise. They wanted me to bring it in today so he and the shop foreman along with the factory rep could diagnose it. They just told me it’s the rear diff coupling, which has to be ordered, but that it’s safe to drive, as I’ve got a 250 trip Friday and Monday. I’m not 100% confident a rear diff coupler issue is that safe…

So I took the car back yesterday and the service manager went for a ride with me and heard the noise. They wanted me to bring it in today so he and the shop foreman along with the factory rep could diagnose it. They just told me it’s the rear diff coupling, which has to be ordered, but that it’s safe to drive, as I’ve got a 250 trip Friday and Monday. I’m not 100% confident a rear diff coupler issue is that safe…
So I just got home and Googled rear differential coupler and it seems this is a very common issue on Toyota RAV4s, the whine coming from the rear diff coupler.
 

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Discussion Starter · #29 ·
If like my dealer they give you a free oil change whenever you want one. But it gets deducted from the maximum you get. My dealer was very upfront about it, I could pay for the 2,500 oil change (I did) and then go on the regular cycle the next one being at 8,000 miles for free. Or I could have used one of my free ones now and have one less down the road.
That flexibility kinda makes too much sense for auto mfrs and dealers… 🫠
 

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Discussion Starter · #31 ·
It gets better. The full Synthetic Amalie oil change was less than if I went to drive through places here. (Except Pep Boys not literally a drive through but cost is the same as dealer and both rotate tires, the others do not)

Downside you have to plan ahead, took 3 weeks for an oil change appointment though a real problem they can do sooner.
My dealer is $40 for oil and filter change.
 

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Discussion Starter · #33 ·
Full synthetic? Wow. Nowhere near that low here anywhere. Even blended is generally higher.
You know what, I hadn't looked. They put in 0W20 Quaker State Ultimate Durability. On the invoice they show it as being $55 but when I go to services in the app it says $39.99.
 

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Discussion Starter · #35 ·
That is full synthetic. Never has full synthetic oil changes been that low here, going back many years. That $55 price is way low never mind $39.99.
The invoice shows $5.50 a quart.
 
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