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Discussion Starter #1
Brand new CX-30 Select (650 miles) has noticeable vibration around 50mph felt in the seat and throughout the car. Not so much in the steering wheel. Vibration is in a narrow range, maybe 49 to 52 mph, but also re-appears less pronounced at 75mph. Together with the dealer tech we compared with brand new CX-30 vehicle on the lot. That car did the same thing. Dealer conclusion is this is a driving characteristic. Dealer refused to do a road force balance of the tires. Dealer spoke to Mazda tech hotline and same thing from there. Nothing is wrong, normal car behavior. Then I spoke to Mazda experience folks. Same conclusion. Nothing wrong. Keep driving as if problem does not exist.

This is quite disappointing from a car company that prides itself on driving characteristic.

Any others with this issue?

I blame this on bad tires, flat spot or balancing but hopefully is not a suspension thing.

One thing I learned from this is... maybe not a good idea to buy a first year production vehicle made in Mexico.

Now, not to be all negative, the car drives fine and of course I do not make a habit of driving it at exactly 50mph. But still,
to get this level of ignorance all around from Mazda is super annoying.
 

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Preferred FWD / Deep Crystal Blue Mica
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Nothing wrong here, a very smooth ride at any speed. If you have another Mazda dealer in your area take it to them to check your problem.
 

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Brand new CX-30 Select (650 miles) has noticeable vibration around 50mph felt in the seat and throughout the car. Not so much in the steering wheel. Vibration is in a narrow range, maybe 49 to 52 mph, but also re-appears less pronounced at 75mph. Together with the dealer tech we compared with brand new CX-30 vehicle on the lot. That car did the same thing. Dealer conclusion is this is a driving characteristic. Dealer refused to do a road force balance of the tires. Dealer spoke to Mazda tech hotline and same thing from there. Nothing is wrong, normal car behavior. Then I spoke to Mazda experience folks. Same conclusion. Nothing wrong. Keep driving as if problem does not exist.

This is quite disappointing from a car company that prides itself on driving characteristic.

Any others with this issue?

I blame this on bad tires, flat spot or balancing but hopefully is not a suspension thing.

One thing I learned from this is... maybe not a good idea to buy a first year production vehicle made in Mexico.

Now, not to be all negative, the car drives fine and of course I do not make a habit of driving it at exactly 50mph. But still,
to get this level of ignorance all around from Mazda is super annoying.
Doesn’t sound right , I’ve done 1200 klms on all different road surfaces and speeds with no vibration problems , not good that your being treated like this , in Australia they are Thailand build but that may change back to Japan because of world economy
 

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2020 Mazda CX-30 GT AWD - Soul Red Crystal
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Firstly, sorry you’re going through this. It must be frustrating.

I do not have any vibration issues at any speed. Only about 600km on the car so far though.

As recommended I’d take it to another dealer for more in depth inspection. Have the tires rotated.

Best of luck & keep us posted on progress.
 

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Discussion Starter #6
I swapped the spare tire with one tire at a time. Drove on same piece of road. Speed range that shows the problem is 47-52 mph. Doing this for the back one tire at a time showed no change in behavior. When I swapped the front driver tire i got a change in behavior. The vibration is less pronounced and more random. Random means coming in and out over the trouble mph range. There are times when the vibration is almost un noticeable. I would say 50% reduction in symptom occurrence and severity. Did same exercise with passemger side tire. Almost same behavior change, but can't say it was exactly the same. Definitely less vibration. One more thing I did is swap front tires with the back tires. No change. Same original behavior.

I also tested with popping transmission in Neutral over the trouble mph range. Vibration is the same.

So what to conclude ? Is not clear-cut.

I think the weight of tires is upsetting the front suspension. I almost would think if i had another spare tire the vibration might go away.

At this point I do not believe is bad wheels/tires nor is it transmission.

I talked to another dealer. They said to take it back to the the dealer I bought the car from.

So yeah, what to do next ? Log complaint with BBB ?
 

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Discussion Starter #7
I took tires for inspection and road force balance at the local shop in town. Passenger side front tire was "hopping" on the machine. They re-mounted the tire to reduce the hopping. They were able to get it to "11". Anything under 20 is good balancing. Rear driver side tire was a "22". With careful re-balancing they were able to get it to a "9". The other two tires were "10" and "11".

Took car for a spin and the problem is 95% gone.

Why the F couldn't the dealer do this ? Why the B.S. about normal characteristic of the car ?

What is going on with the quality control at the Mexico factory ? Not good and not confidence inspiring in the overall quality of the vehicle.

Happy the problem is fixed and related to tires only, but pissed with the way Mazda handled this. I would think twice before buying or recommending Mazda based on this interaction.

Tires are 19 inch Bridgestone Turanza EL440, which are rated pretty badly on TireRack, so yeah not good again...

Getting a bit philosophical here....

Why would a company like Mazda that prides itself on driving experience choose to put these cheap tires on ?
But yes, we know the reason. Cost.
But still, why take a chance compromising the most important differentiating feature for them ?
 

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Discussion Starter #9
Yes. $150. By local shop I mean Sullivan Tire shop in Westford MA, USA..
Will talk to chief at Mazda dealer service tomorrow to see if he can make it right. I doubt it given his prior attitude.
 

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2016 Soul SX 2.0L - Caribbean Blue
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service adjustments like wheel balancing, should be set up correct by the PDI but are also covered for 12 months - at least here in Canada.
From the warranty book:
Adjustments:
Service adjustment is covered for the first 12 months (unlimited distance).
Service adjustment means minor repairs not usually associated with the replacement
of parts, such as wheel balance and alignment, tension adjustment of automatic
transmission throttle cable and V-belt, fitting of engine hood, trunk lid, or rear hatch,
etc.
 

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2016 Soul SX 2.0L - Caribbean Blue
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Tires are 19 inch Bridgestone Turanza EL440, which are rated pretty badly on TireRack, so yeah not good again...
I wonder if the dealer switched tires before you purchased the Select model as P215 / 55 R18 are the correct size tire for the CX-30, not 19". Maybe this is why you are having the problem. No CX-30 takes 19" tires from the factory.
 

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2020 Mazda CX-30 GT AWD - Soul Red Crystal
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Your dealer should make it right. Even if they can give you a credit of $150 towards oil changes or something.
 

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20 CX-30 AWD JBM Prem
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Took car for a spin and the problem is 95% gone.

Why the F couldn't the dealer do this ? Why the B.S. about normal characteristic of the car ?
A know-it-all attitude & lazy?
Glad to hear you found a nearly complete resolution. Your remaining 5% is likely still in the tires.
 

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AWD GT CX-30 ceramic coated
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Brand new CX-30 Select (650 miles) has noticeable vibration around 50mph felt in the seat and throughout the car. Not so much in the steering wheel. Vibration is in a narrow range, maybe 49 to 52 mph, but also re-appears less pronounced at 75mph. Together with the dealer tech we compared with brand new CX-30 vehicle on the lot. That car did the same thing. Dealer conclusion is this is a driving characteristic. Dealer refused to do a road force balance of the tires. Dealer spoke to Mazda tech hotline and same thing from there. Nothing is wrong, normal car behavior. Then I spoke to Mazda experience folks. Same conclusion. Nothing wrong. Keep driving as if problem does not exist.

This is quite disappointing from a car company that prides itself on driving characteristic.

Any others with this issue?

I blame this on bad tires, flat spot or balancing but hopefully is not a suspension thing.

One thing I learned from this is... maybe not a good idea to buy a first year production vehicle made in Mexico.

Now, not to be all negative, the car drives fine and of course I do not make a habit of driving it at exactly 50mph. But still,
to get this level of ignorance all around from Mazda is super annoying.
the only thing i notice is a slight shutter from the transmission at lower speed when starting to accelerate and then let off and coast but im sure that just a clutch thing tho lol it reminds of a cvt a bit haha i had two nissans and that was a normal thing for their xtronic cvt. tho i do notice a bit of a rattle noise in the dash closer to the drivers side over certin bumps and im not sure what it is and i have emptied everything out. oh well I leased mine on purpose since i knew it was new for 2020 so im not stuck with it but overall i really like the vehicle.
 

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CX-30 G122 AT Comfort Machine Grey
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I don't know whether the US or Canadian ones have cylinder deactivation but that is a known cause for vibrations in 2cyl mode between 1500-2000 rpm. In Europe there is TSI for replacement of radiator mounts and PCM software since this month. Mine gets that in two weeks time.
 

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20 CX-30 AWD JBM Prem
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The Premier model in the US has cylinder deactivation. I haven't looked up the operating parameters but would expect it to operate only when the transmission is in 6th gear and there is a low load on the engine. That is how the deactivation works in my Chevy truck.
 
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