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An observation I can make though before replacement is that I haven't experienced the noise on any journey since the outside air temperature has dropped below 20 degrees, So my feeling is that it is hot ambient air temperature related? therefore we may not know if replacing the supercharger has cured the issue for good until we go into spring and summer next year.?
Looking promising. However the supercharger on mine started making the noise in December 2020 and was replaced in January 2021 so that one definitely wasn't related to warmer outside air. And I found that it wasn't just about getting to engine temperature, either. I had to go about 20 minutes beyond that - then once the supercharger drive/supercharger itself had got hot, the squeaking then started... And sometimes it was a bit intermittent. So persistence is required.
 

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Looking promising. However the supercharger on mine started making the noise in December 2020 and was replaced in January 2021 so that one definitely wasn't related to warmer outside air. And I found that it wasn't just about getting to engine temperature, either. I had to go about 20 minutes beyond that - then once the supercharger drive/supercharger itself had got hot, the squeaking then started... And sometimes it was a bit intermittent. So persistence is required.
I mean for sure the experience of this squeaking noise could be different between cars and driving?. I simply first heard it on a long drive home from a holiday in Scotland early August and then a number of times after that where the noise appeared around 40 or 50 miles into a journey but doing that same or similar journey's since the end of September the noise wouldn't manifest itself.

Once it starts happening though, its there for the remainder of the journey and to my mind anyway is often accompanied by a feint clicking sound as though something (a solenoid or mech of some sort?) is kicking in and out?. The thing is as I pointed out to my dealer ( who originally dismissed my complaint as it being a normal noise for a skyactiv X engine!) Even though it happens on a light touch of the throttle pedal and is there for no more than a second each time, It's a distraction and therefore a potential safety issue while driving.

I had been reluctant to allow my dealer techs to drive the car for a long journey as I couldn't reproduce it myself at present and therefore that would just have been a waste of mileage and petrol!, so I had resigned myself to having to wait until it got more persistent before anything would be done about it. Therefore actually very pleasantly surprised that in my case at least Mazda UK are being proactive in replacing the parts they believe are causing the issue.
 

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Update on mine:

I had my Supercharger replaced about 5-6 weeks ago now and haven't had any issues since - I've even had a few good long journeys.

I was getting the noise consistently with the old supercharger, even when the outside temp was below 20deg (see @servlox previous update).

As far as I'm concerned I'll consider this "fixed".

I hope someone else gets as much info and help from this thread as I did. Cheers (y)

(side note: I asked the dealer how much this would have cost me if I'd had to pay for it myself i.e. non-warranty. He told me in the region of £3.5K.. :eek:)
 

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Update on mine:

I had my Supercharger replaced about 5-6 weeks ago now and haven't had any issues since - I've even had a few good long journeys.

I was getting the noise consistently with the old supercharger, even when the outside temp was below 20deg (see @servlox previous update).

As far as I'm concerned I'll consider this "fixed".

I hope someone else gets as much info and help from this thread as I did. Cheers (y)

(side note: I asked the dealer how much this would have cost me if I'd had to pay for it myself i.e. non-warranty. He told me in the region of £3.5K.. :eek:)
Mine was replaced about a month ago now and although I haven't done many miles since I am sure it should be an end to the issue. Wow at that cost I am not surprised Mazda are waiting until owners report the noise issue. It does make you wonder though if its worth keeping modern tech vehicles beyond warranty expiry? As the cost of replacing bad components could quickly escalate into being uneconomical,
 

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It's a great point.. unless you can get extended warranty there's always that risk
Yes that's also a good point my car will be out of warranty this time next year, so I will need to consider later this year if an extended warranty from Mazda or any other provider is going to be a sensible option?
 

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2021 CX-30 e-SKYACTIVE X MHEV GT Sport Tech Soul Red Crystal 2WD Manual
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Yes that's also a good point my car will be out of warranty this time next year, so I will need to consider later this year if an extended warranty from Mazda or any other provider is going to be a sensible option?
Extended warranties are a bit of a gimmick, as in reality they are insurance policies and, as with any insurance, when it comes to claiming it the underwriters will be trying to wiggle their way out of it by all possible means. If you decide to go this way, check all small prints, as usually a lot of components are excluded from these extended warranties. I was offered these warranties for all my previous and current Mazdas and, when calculating the risks and costs against the cost of a warranty, none of them made any financial sense. Now a lot of manufacturers offer 5 - 7 years of proper manufacturer's warranty and you are right that for modern tech these become a critical factor when selecting your new car. I definitely will be looking for a different brand when it comes to replacing my current CX-30 despite the fact that I was loyal to Mazda for over 20 years and love their cars. Unless, of course, they change their policy and start offering decent warranty periods. I guess they will start losing customers if they don't catch up with the trend. It will be interesting to see what warranty they are going to be offering on Yaris re-badged as Mazda 2. Toyota gives 5 years. Who is going to buy Yaris with Mazda 2 badge and 3 years warranty?
 

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Extended warranties are a bit of a gimmick, as in reality they are insurance policies and, as with any insurance, when it comes to claiming it the underwriters will be trying to wiggle their way out of it by all possible means. If you decide to go this way, check all small prints, as usually a lot of components are excluded from these extended warranties. I was offered these warranties for all my previous and current Mazdas and, when calculating the risks and costs against the cost of a warranty, none of them made any financial sense. Now a lot of manufacturers offer 5 - 7 years of proper manufacturer's warranty and you are right that for modern tech these become a critical factor when selecting your new car. I definitely will be looking for a different brand when it comes to replacing my current CX-30 despite the fact that I was loyal to Mazda for over 20 years and love their cars. Unless, of course, they change their policy and start offering decent warranty periods. I guess they will start losing customers if they don't catch up with the trend. It will be interesting to see what warranty they are going to be offering on Yaris re-badged as Mazda 2. Toyota gives 5 years. Who is going to buy Yaris with Mazda 2 badge and 3 years warranty?
Yes I know. The critical thing about aftermarket or extended warranties is its about "Mechanical breakdown" of components. So things like this noise which is coming from the supercharger would have to develop into some kind of proven breakage before even being considered as a valid claim. Wear and tear from a noise generally wouldn't be enough. In the case of the our supercharger squeak/groan noise and anything else within manufacturers warranty the thing to do is to always report any issues to the dealer and get it on record so if something develops after warranty has expired you have an audit trail back to when you could argue a case for goodwill due to an inherent manufacturing defect. I have a few possible software issues on my car, which so far haven't been traced and I have a feeling wont be resolved within the next 12 months? But I have been careful to ensure my dealer has logged these with Mazda UK so they have a record of them for future reference.
 

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I've got a question I have a 2020 cx30 skyactive x and it seems to have started making a groaning rumble noise on acceleration when around 1800 2000 rpm. I've not really noticed this in 1.5 years of having the car some suggestions on this forum suggest could be compressor supercharger issues are these symptoms of a fault
 

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I've got a question I have a 2020 cx30 skyactive x and it seems to have started making a groaning rumble noise on acceleration when around 1800 2000 rpm. I've not really noticed this in 1.5 years of having the car some suggestions on this forum suggest could be compressor supercharger issues are these symptoms of a fault
Could be, in my experience it will only start happening after around 75 miles+ of a journey. I had the supercharger initially replaced with a superceeded part last November. It seemed to cure it however the noise came back within another 1000 miles. Mazda UK have instructed the dealer to replace it again! Im off the road at present due to having an operation on one of my legs, so the car won't go back in for its 2nd replacement unit until the beginning of June. I'm hoping this time they fix it for good.
 

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I've got a question I have a 2020 cx30 skyactive x and it seems to have started making a groaning rumble noise on acceleration when around 1800 2000 rpm. I've not really noticed this in 1.5 years of having the car some suggestions on this forum suggest could be compressor supercharger issues are these symptoms of a fault
As @servlox said.. it could be so it's worth getting it checked out. I had my original supercharger replaced too and it cured my issues however I've also noticed in the last few weeks it has returned but not quite in its original form !!

Previously the noise would surface after about 30-40 min driving... now it "sometimes" appears when I first get in the car but tends to disappear within a couple of miles of drive. It's not every time either so makes me wonder if it's ambient temperature related.

Very frustrating because it was difficult enough demonstrating the problem to my dealer the first time ... this would be even more difficult.
 

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As @servlox said.. it could be so it's worth getting it checked out. I had my original supercharger replaced too and it cured my issues however I've also noticed in the last few weeks it has returned but not quite in its original form !!

Previously the noise would surface after about 30-40 min driving... now it "sometimes" appears when I first get in the car but tends to disappear within a couple of miles of drive. It's not every time either so makes me wonder if it's ambient temperature related.

Very frustrating because it was difficult enough demonstrating the problem to my dealer the first time ... this would be even more difficult.
Another Skyactiv X owner alerted me on another forum that he had his initial supercharger replaced but the noise returned after a further 1500 miles and they advocated replacing the supercharger again on his. Clearly Mazda are convinced its in the supercharger but on some of our cars its not curing it first time for some reason?. This time I actually managed to be passing my dealer on an occasion when the noise was occurring, I called in grabbed a technician and took him out on a drive with me, so he heard it happening. We had the energy graphics screen up on the central display and his personal opinion was that the noise could be linked to the ISG (Integrated Starter Generator ) as the noise on throttle application corresponded with the electric regen energy flow graphics. However when they spoke to Mazda UK this theory was dismissed and they advised another warranty replacement of the supercharger. Although with the caveat this time around that they are also going to precautionary replace the corresponding drive belt and tensioner just in case it has anything to do with this perhaps? Mine goes back in early June to have this done and then I will report back after whether or not it has cured it for good.
 

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Another update on my "returning" noise problem.

I've just had it back into the Mazda dealer after Mazda UK green-lit another warranty repair.

Like I mentioned previously, the "supercharger screech/groan" returned even after replacement but was only evident for about 10 mins after initially driving (after leaving car overnight etc). This time they didn't replace the entire Supercharger - instead I'm led to believe that it was 2 x Tensioners in the Supercharger (or related to the SC). Regardless, they still had the car in for nearly 2 days to complete the work !

The noise has gone (for now at least)

As it happens though, I'm swapping my manual CX-30 for a new Automatic CX-30 in a couple weeks anyway so probably heard the last of it now... unless the new car has the same issues. 🤞
 
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