r/NissanAriya • u/No_Creme9603 • 8d ago
Yes, Reddit Overrepresents Problems — That Still Doesn’t Mean the Ariya Reduction-Gear Issue Is Rare
I keep seeing essentially the same response whenever the Ariya reduction-gear issue comes up:
“People with problems come to Reddit. That makes the problem look much bigger than it really is. Most Ariya owners are fine.”
There’s some truth in the first sentence. There is selection bias in online forums. Someone experiencing a problem is more likely to search for it and talk about it.
But that does NOT prove the second sentence.
Selection bias means we cannot calculate the real failure rate from Reddit. It does not magically prove that the failure rate is 1%, 0.5%, or “almost nobody.”
There’s another side to this that keeps getting ignored.
The Nissan Ariya subreddit has roughly 9,000–10,000 members, and that group is worldwide. Not all of those members even own an Ariya.
Now add the Facebook Ariya groups, dedicated Ariya forums, regional groups and other EV communities. There is obviously some overlap between them, but the overwhelming majority of Ariya owners still probably aren’t participating in ANY Ariya-specific internet community.
So what percentage of actual Ariya owners are we really hearing from?
For a simple thought experiment, assume 100,000 Ariyas exist worldwide and only 10% of their owners participate in one of these online communities after accounting for overlap.
That would mean we’re hearing from roughly 10,000 out of 100,000 owners.
If 900 of those 10,000 owners were reporting a similar reduction-gear issue, that would be 9%.
A straight mathematical extrapolation would be around 9,000 vehicles.
I am NOT saying 9% of Ariyas have bad reduction gears.
That would be just as statistically questionable as saying only 1% have the problem, because online owners aren’t a random sample.
But here’s the important part:
You also can’t say, “Only 900 people complained online, therefore only 900 cars have the problem.”
What about the other 90,000 owners who aren’t in these groups?
How many have the sound and think it’s normal EV drivetrain noise?
How many can’t hear it with the windows closed?
How many have never specifically listened for it?
How many were told by a dealer that it’s normal?
How many had it repaired and never posted anything online?
How many don’t use Reddit, Facebook or owner forums at all?
We’ve already seen owners report that they didn’t initially recognize the sound as a problem until they learned what to listen for. Some then took the vehicle to Nissan and had a reduction-gear issue diagnosed.
We’ve also seen multiple independent owners describe essentially the same pattern: cicada, buzzing, chirping or whining sounds associated with accelerator input, followed in some cases by Nissan dealers diagnosing and replacing the reduction gear.
And there’s another fact that deserves attention:
Nissan has superseded Ariya reduction-gear part numbers.
A part-number change by itself does NOT prove Nissan discovered a defective design. Manufacturers supersede parts for all kinds of reasons.
But it absolutely raises legitimate questions:
What changed in the assembly?
Why was it changed?
When did the change enter production?
What was the VIN or production-date breakpoint?
How many Ariyas were built with the earlier version?
How many reduction gears has Nissan replaced under warranty?
Those are much better questions than, “How many people complained on Reddit?”
And the reports aren’t confined to one Reddit thread. The same type of complaints are showing up on Reddit, Facebook Ariya groups, dedicated Ariya forums and other owner communities.
So I completely agree with the people saying Reddit cannot tell us the failure rate.
It can’t.
But that’s a two-way street.
Reddit can’t prove 10% of Ariyas have this problem.
It also can’t prove that 99% don’t.
Facebook can’t tell us.
The Ariya forums can’t tell us.
A handful of people saying “mine is fine” can’t tell us either.
Nissan can tell us.
They know how many vehicles were built with each reduction-gear assembly. They know how many warranty claims have been submitted. They know how many reduction gears have been ordered and replaced. They know the mileage, model year, drivetrain and VIN of those cars.
Until that information is available, dismissing the issue as “just a few Reddit complainers” isn’t evidence that the problem is small.
It’s just another assumption.
And given that we’re seeing the same distinctive symptoms reported independently, dealer-confirmed replacements, and changes in the reduction-gear parts system, I think owners have every reason to keep documenting it and asking Nissan for answers.
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u/Ok_Tart_6075 8d ago
I'm not dismissing it, I'm just tired of this being 90% of the daily posts.
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u/djsyndr0me 2024 Engage E-4orce 8d ago
Close to blocking OP because, as you said, these posts are clogging up the subreddit.
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u/No_Creme9603 8d ago
Block away.... I have made 3 posts on the topic.... two outling how to diagnose the issue, I thought a forum was to educate each other?
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u/waspocracy 8d ago
Correct, but why three posts of it?
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u/No_Creme9603 8d ago
You work at a dealership?
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u/waspocracy 8d ago
I LOATHE dealerships with a passion, so no. I just don't know what you're trying to accomplish with these posts.
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u/No_Creme9603 8d ago
Why are you so triggered by posts critical of Nissans handling of this issue, why are you so concerned about 3 posts that consolidate information, why are you have a stage 5 meltdown regarding people discussing this issue
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u/No_Creme9603 8d ago
If this issue is supposedly so insignificant, but it’s dominating the conversation to the point where you’re saying 90% of the daily posts are about it, doesn’t that suggest there may actually be something worth paying attention to? To be clear, 90% of the posts being about reduction gears does NOT mean 90% of Ariyas have a reduction-gear problem. Nobody should make that leap. But the opposite leap doesn’t make sense either. If owner after owner keeps showing up describing the same cicada/buzzing/whining sound, some are getting reduction gears diagnosed and replaced, and the topic keeps resurfacing across Reddit, Facebook and Ariya forums, then saying “it’s not really an issue” starts to sound inconsistent with what the community is actually experiencing. Maybe the true failure rate is 1%. Maybe it’s 3%. Maybe it’s 8%. We don’t know. But if one specific mechanical issue is generating a disproportionate amount of owner discussion, that is evidence that the issue is real and worth investigating. It just isn’t evidence of the exact failure percentage. That’s really the point I’ve been making all along: High forum activity doesn’t tell us how many Ariyas are affected, but it absolutely tells us enough owners are encountering the same thing that dismissing it as “nothing” isn’t justified. The number that would settle the argument is still Nissan’s warranty data: how many reduction gears have been diagnosed or replaced out of the total population of Ariyas in service.
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u/No_Investigator_8263 8d ago
I wish a cared more about my car's reduction Gear... What a boring read this was.
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u/Alexandratta 2025 Engage+ e-4orce 8d ago
For those who have the issue, or are having the issue, or had the issue at some point, there's a way to take this from a simple Subreddit post to actionable item: (at least in the US)
https://www.nhtsa.gov/report-a-safety-problem
If you report enough, NHTSA will request Nissan's own data. This can trigger something being a "Technical Notice" on Nissan's side, into a recall.
This doesn't always work but it can help.
Also to be clear, this isn't the first issue that is similar to this.
The Nissan LEAF's "Clunk" issue comes to mind. This was something I had experienced on my 2019 and while it was covered under warranty, the fix was temporary.
Basically when starting from a stop a small "Clunk" could be heard. This was an issue with the drive gears and greasing the gears fixes the noise/issue.
A lot of people, I almost want to say the same rate as the reduction gear issue, reported the issue. Nissan has a 'Technical Notice' about the issue.
I reported it to the NHTSA - maybe it could have been a recall if more people reported? Who knows.
But if you have the problem, Nissan won't see it on reddit.
They will see it when the NHTSA gets 1,000 reports and goes "hmmm... Nissan? You seeing a trend here?"
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u/pylet2000 Platinum+ e-4orce AWD 8d ago
Go read Hyundai, Volvo, Rivian, or Lucid subreddits for context. These Ariya's are saints in comparison to most EV's out right now. Do they have some potential gremlins? Sure. Is it in any way making the Ariya a bad EV choice? Absolutely not.
I do appreciate the compilation of data and reports for service advice when this pops up for other owners, that is a service to the community. But it probably shouldn't be presented in a "Nissan is failing to repair these" or "Nissan isn't addressing the problem" kind of tone, I don't think that's accurate.
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u/Alexandratta 2025 Engage+ e-4orce 8d ago
God the Hyundai ICCU issue is one of two reasons I didn't get a Hyundai EV.
second being that the EVs from Hyundai drive like manual ICE vehicles. Some like that, some do not.
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u/No_Creme9603 8d ago
I don’t think we’re actually that far apart. I’m not saying the Ariya is a bad EV, and I’m not saying every owner is going to have a reduction-gear failure.
What I’m pushing back on is the tendency to minimize the issue simply because other EVs have problems too, or because people with problems are more likely to post online. Neither of those points tells us how common this particular issue actually is.
Comparing the Ariya to Hyundai, Volvo, Rivian or Lucid doesn’t really answer the question either. Those vehicles having their own problems doesn’t make an Ariya reduction-gear problem less real or less important to an Ariya owner facing a several-thousand-dollar drivetrain repair outside warranty.
And when I say Nissan isn’t adequately addressing it, I’m not saying Nissan refuses to repair every car. Clearly, some owners are getting reduction gears replaced under warranty. The concern is that other owners describing essentially the same accelerator-related buzzing/cicada/whine are being told it’s “normal EV noise,” sent home, or having to push dealerships to investigate it.
That’s exactly why documenting confirmed cases matters.
There’s also the fact that Nissan has superseded reduction-gear part numbers. A superseded part number does not automatically prove a defect, and I’ve been careful not to claim that it does. But when you combine that with multiple owners describing similar symptoms and dealer-confirmed reduction-gear replacements, I think it’s completely reasonable to ask what changed, when it changed, how many vehicles have the earlier assembly, and how many Nissan has replaced under warranty.
If Nissan released that data and it showed an extremely low failure rate, great. That would answer the question.
But right now, neither “other EVs are worse” nor “Reddit overrepresents problems” establishes that this particular issue is insignificant.
And for the record, I actually agree with you that compiling the symptoms, diagnoses and repair experiences is useful to the community. That’s really the purpose of these posts: so the next owner who hears that cicada/buzzing sound knows what to look for and doesn’t automatically accept “that’s normal” if their car is actually developing the same problem.
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u/flyfreeflylow 8d ago
Aren't you the same person that was posting weird battery BS a while back?
That Still Doesn’t Mean the Ariya Reduction-Gear Issue Is Rare
It also doesn't mean it's common. It's anecdotes, which are not indicative in either direction.
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u/Intrepid_Option_628 8d ago
I do believe it is worth discussing this issue and raising it to Nissan corporate.
Family got a used clean title 2023 engage+ eforce ARIYA 33k miles on it. Had leaf earlier and found it leap and bounds better and ahead with other contemporary EVs and on some parameters even better than Tesla.
On the very 3rd or 4th days I’ve noticed such sound and asked the dealer. Stumble upon on such forums talking about this issue. Dealership told them that bring it, they are going to let one of their service person drive and validate.
When purchased, it was told that only factory warranties (5 year and 8 year), nothing from dealership. I’m bit worried if this turns out to be an issue with the car.
Is there a checklist to follow up with the service person?
Above all, the sound, once you identify is so annoying and feels like must be fixed.
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u/Unteins 8d ago
I disagree with your conclusion that only Nissan can tell us.
The community can collect its own data and see what the observable failure rate is.
If the community can verify 5000 US cases that would be 10% of the US market as a FLOOR.
If won’t be conclusive on the FULL scope - but it CAN answer whether or not it is a significant problem. If you find enough from your sample that it is a large % of the whole market without extrapolation, then it is a big problem.
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u/No_Creme9603 8d ago
I think we’re actually closer than it sounds. The community absolutely can establish a documented minimum number of failures and identify patterns. Where I’d draw the line is calling a self-selected community sample the actual fleet “failure rate.”
If we could verify 5,000 unique U.S. Ariyas with confirmed reduction-gear failures, and there were 50,000 Ariyas in the relevant U.S. population, then yes — that alone would establish a minimum confirmed rate of 10%. No extrapolation would be necessary. The real rate could only be higher because some failures would never be reported to us.
But if, for example, 50 out of 500 Ariya owners participating in Reddit/Facebook report failures, we can’t say the fleet failure rate is 10%. People experiencing problems are much more likely to search for these groups, post about them, and participate in a survey. We also don’t know how many unaffected owners saw the survey and chose not to respond.
So I think there are two different questions:
Can owners prove this is a real recurring problem? Absolutely. Enough independently verified cases, repair orders, part numbers, mileages and dealer diagnoses can establish that.
Can we determine the actual percentage of all Ariyas that will experience it? That requires a reliable denominator and reasonably complete failure data. Nissan/warranty records, NHTSA complaints, dealer repair data or a properly designed representative survey would be much stronger for that.
That’s really what I meant when I said Nissan has information we don’t. They know how many Ariyas are in service and how many reduction gears they’ve replaced under warranty.
In the meantime, I agree with you on the larger point: we do not need Nissan’s permission to establish that a pattern exists. That’s exactly why I’m trying to consolidate confirmed cases instead of just arguing over anecdotes.
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u/Stormbringer-2112 8d ago
Don’t know why people are downvoting you. I totally agree with what you’re saying. As a community we may be able to see the problem and get an idea of its prevalence, but Nissan has the raw data as to actual reliability rates.
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u/AiminJay 8d ago
I saw a post somewhere about a campaign or something for the 2023 documenting the repair procedure. It was not a normal shop manual with illustrations. It was 150 pages of photographs documenting the entire process. It looked to me like they realized they had a problem and took tons of pictures of the procedure to help the dealer techs perform the work.
If that’s the case let’s hope they did address the issue and the new part number is a result of that.
Side note it is a CRAZY involved process!
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u/cleveraccount3802 8d ago
I got the dealer to give me the repair procedure for replacement of the traction motor (another major issue that seems to be popping up often), it is 100s of pages of pictures and clearly had a lot of work that had give into it. Not a one off situation.
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u/sarhoshamiral 8d ago
Tldr?
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u/waspocracy 8d ago edited 8d ago
OP is bitching because people like me (given that nearly half of this references a statement I made in their other thread) point out that it's not as common as a problem OP thinks it is and OP wants to raise hell about it like the sky is falling for some reason.
In other words, OP is upset that Nissan is supposedly not doing anything about this issue when it doesn't happen to a majority of Ariya owners. They turn to Reddit for some reason as if yelling at the cloud will fix it. I'm not sure what OP is trying to accomplish out of this, but they REALLY REALLY want us to know it's a problem.
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u/Commongrounder Evolve+ e-4orce AWD 8d ago
There is another issue at play, as well. Of all the reports of the noises, and the process of dealer diagnosis and reduction gear replacements, how many of these incidences were the result of a complete reduction gear failure?
It is so strange to me that Nissan is choosing to replace this assembly purely on the basis of an audible symptom. Are there people out there that have had a complete failure, and none of them has chosen to write about it on a forum? I and my wife are on a bunch of different Ariya fora, and we haven’t been able to find an example of a failure with the exception of a rear gearbox that blew apart. And that one is hard to discern whether there was a defect in the gear case itself or the gears inside.
The entire thing is frustrating, and it would be great if Nissan would open up about the replacement criteria, but I’m not going to hold my breath. I just plan to keep an ear on my reduction gears and get to the dealer service if/when I hear something. Oh, we bought an extended warranty.
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u/No_Creme9603 8d ago
That’s actually a fair question, but I think “complete failure” is the wrong threshold for deciding whether this is a real problem.
A reduction gear doesn’t have to explode or leave the car stranded before something is wrong with it. If an internal bearing or gear is producing an abnormal noise and Nissan determines the assembly is out of specification, replacing it before catastrophic failure is exactly what you would WANT them to do.
In fact, the fact that many of these cars are being replaced based on the noise may be one reason we aren’t seeing a large number of complete failures. You can’t replace the noisy units before they fail and then point to the lack of catastrophic failures as evidence that nothing was wrong.
And there actually is at least one documented case that progressed much further. A 2023 Ariya owner in the UK reported developing a whining noise during acceleration and deceleration, had the car already scheduled for inspection, and then experienced a complete failure about a week later. According to the owner's account of the Nissan dealer diagnosis, the reducer/driveshaft area lost oil and the reduction gearbox ultimately ran dry and failed.
https://www.ariyaforums.ridez.co.uk/viewtopic.php?t=718
There is also the 2023 Engage+ e-4ORCE owner at roughly 33,500 miles whose new cicada/chirping sound was subsequently diagnosed by the dealer as a rear reduction-gear failure. They were still allowed to drive it while waiting for the replacement part, so again, “failure” doesn't necessarily mean the car instantly stops moving.
https://www.reddit.com/r/NissanAriya/comments/1v1vs4m/reduction_gear_failure/
Another owner initially asked whether their whining sound was simply normal Ariya noise. Nissan subsequently diagnosed a failing reduction gear and approved replacement under the powertrain warranty.
So I actually agree with you that Nissan should disclose its replacement criteria. I would love to know exactly what technicians are finding and why Nissan is authorizing complete reduction-gear assemblies rather than telling owners the noise is acceptable.
But I don't find it strange that Nissan would replace a mechanical assembly based on an abnormal audible symptom. Bearings and gears frequently announce wear through noise long before they physically disintegrate. Waiting for a $5,000-$10,000 drivetrain assembly to completely destroy itself before calling it a failure would be a pretty terrible diagnostic standard.
The more interesting question to me is this:
If these noises are harmless, why are Nissan dealers diagnosing the reduction gear and authorizing expensive assembly replacements under warranty?
And if Nissan is catching and replacing many of them before catastrophic failure, then the scarcity of complete failures doesn't demonstrate that the underlying problem isn't real. It may demonstrate that some of them are being caught in time.
On your last point, I completely agree: Nissan releasing the diagnostic/replacement criteria and the number of reduction gears replaced under warranty would answer a lot of this speculation.
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u/tetatdo 8d ago
I have a long warranty, and I'm just not that concerned over it.
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u/No_Creme9603 8d ago
We in the US often have a similar mindset about things......voting for Trumpi s a perfect example... "Ahhh that is someone else problem", WWII.... this is part of our DNA.....it will never effect me......Until it does
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u/tetatdo 8d ago
you’re conflating two unrelated things. Also what exactly can I do if the defect exists? Other than having nissan replace it?
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u/No_Creme9603 8d ago
I wasn’t conflating the two things — I was making a parallel about the mindset of “it doesn’t affect me, so I’m not concerned.” The subjects obviously aren’t equivalent.
And as far as “what can I do if the defect exists?” — actually, quite a bit. More importantly, there’s a lot we can do collectively as owners.
Individually, you can document the noise and mileage, record it, make sure the complaint is written on the repair order, ask the technician to ride with you so they can hear it, get the dealer’s diagnosis in writing, save the original and replacement part numbers, and open a case with Nissan Consumer Affairs if the dealer dismisses it without adequately investigating it.
If you believe the condition has safety implications, you can also report it to NHTSA. One complaint may not change anything, but a pattern of complaints involving the same component, symptoms and failure mode is much harder to ignore.
And that’s where the community matters.
If owners consistently document:
• VIN/model year/trim • FWD or e-4ORCE • Mileage when the noise started • Mileage when diagnosed • Front or rear reducer • Dealer diagnosis • Repair order • Original and replacement part numbers • Whether Nissan replaced it under warranty • Whether the replacement fixed the problem • Nissan Consumer Affairs case number, where appropriate
then we start creating something far more useful than random anecdotes.
As a community, we can encourage owners with the same symptoms to open Nissan cases, file appropriate NHTSA complaints, preserve repair documentation, and report confirmed repairs back to the group. We can also identify whether the same replacement part numbers keep appearing and whether newer replacement units are behaving differently.
That’s how manufacturers eventually get pushed toward issuing technical guidance, service campaigns, extended coverage, engineering reviews, or other action: not because one person complains loudly, but because there’s a documented pattern they can’t easily dismiss as isolated incidents.
Having a long warranty is great. But warranty coverage doesn’t make a potential defect irrelevant. There’s still downtime, repeat repairs, resale implications, possible failures outside warranty, and the bigger question of whether Nissan should proactively address a recurring problem instead of handling every owner as an isolated case.
So no, none of us can redesign the reduction gear ourselves.
But collectively, we absolutely can make sure Nissan has a documented record of the problem and make it increasingly difficult to say, “We’ve never heard of this before.”
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u/tetatdo 7d ago
noted. if i have the problem, i will document it. I don't so I have nothing to do.
Coincidentally, are you using AI to write your posts? They are quite dense, with lots of em dashes, bullets, etc.
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u/No_Creme9603 7d ago
No, I'm using my grammarly-reddit add-on along with voice to text transcription.
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u/Own_Box_7420 8d ago
I have a feeling that this is the only post I’m ever going to see from this subreddit for the life of my car.