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Tesla Model S Drive Unit Replacement by the Numbers

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During my early days of researching the Tesla Model S, I had concerns about a number of things that were emerging in the press. Fires, Model S drive unit issues, and handling in the snow. Tesla quickly addressed the “firegate” issue by retrofitting the Model S with a titanium shield. My concerns around winter driving, in particular handling in the snow, also became a non-issue after watching several winter driving videos put together by Bjørn Nyland.

Within no time, I became a new Model S owner and quickly learned that driving in the winter could actually be quite fun with a good set of winter tires. Tesla later introduced the all-wheel drive “D” models putting to rest any remaining doubt that the Model S could be the best and safest handling car in the world.

But one question still remains for me, Has Tesla dealt with the Drive Unit issues?

Model S Drive Unit Replacement by the Numbers

There is a group of Model S owners across the forums, but also validated by major publications such as Edmunds, that have had one or more drive unit replacements.

Early reports of drive unit issues ranged from total failures that left the Model S inoperable, to more recent complaints of clunking and milling noises. Elon has said in the past that many of these pre-emptive drive unit replacements were unnecessary and a simple $0.50 shim was all that was really needed, yet Tesla Service centers have been proactively replacing drive units.

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The following polls from TMC show that a majority of Model S owners have had their drive units replaced.

Drive Unit Poll

While the poll only represents a small sample of Model S owners, one might draw significance in the numbers as the density circles around owners needing a drive unit replacement at relatively low mileage, and without any harsh driving prior to failure.

The polls also give insight to the motive behind each drive unit replacement.

Non replaced DUs

DU replacements by build date

 

Though it appears the issues mainly center around earlier versions of the Model S, there’s been reports of newer Model S with Autopilot hardware hearing milling noises coming from the drive unit. One viewer described the sound as “sawing wood”.

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Tesla’s Response to Drive Unit Issues

In typical Tesla fashion, the company acted fast to address the issues, and curb concerns by offering an unlimited mile/8 year warranty on the drive unit. I think this was a great response by Tesla which put to rest any concerns about the quality and long term durability of their drive units.

Elon is now talking about building a power train that will last a million miles and I believe Tesla continues to put significant energy into improving the drive units. Tesla continues to honor the warranty and is proactively replacing drive units that show early signs of problems.

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Tesla-Drive-Unit

 

My Experience

After 12 months of Model S ownership and 30k miles drive, I started hearing a humming noise from the rear of my Model S during highway cruising. The noise was unusual as I had gotten used to hearing only the noise of the tires and wind, but there was a new noise only noticeable when cruising or decelerating with regeneration at 65 MPH and over. The noise continued to become more audible over the next few months, but I learned to live with it and did not contact Tesla. My personal rule of thumb on noise related issues is to wait for passengers to comment on it first. It’s my self crazy check.

Two months after the original drive unit humming noises began, a higher pitched milling type noise started occuring when traveling at speeds of 20 MPH or less. The sound varied depending on how much power was being used. That’s when I reached out to Tesla.

Drive unit details

Tesla service record

 

Tesla service had me come in for a test drive which they can do on demand without you needing to wait. We drove about a block before the Tesla service technician said the drive unit needed to be replaced.

The explanation was that tolerances inside the drive unit have led to metal particles getting into the fluid around the drive unit, and as the concentration of particles increased, it caused the noise from the drive unit to become louder when under load. The new drive units evidently have better tolerances and are less prone to having metal particles being shaved off.

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At that time, Tesla service has been very backed up here in Massachusetts so my appointment for the drive unit replacement was scheduled six weeks out. I put on another 4,000 miles during that wait time, with an increasingly louder drive unit, before it was finally replaced.

When Tesla replaces a drive unit, they replace both the drive unit and inverter as you can see from a copy of the parts list. The last letter in the drive unit part number (“M” in my case) seems to indicate the generation of the drive unit. The later the letter the better, with the “Q”s seeming to have the best longevity according to the forums.

I’m happy to say that I’ve logged 8,000 miles of happy and noise-free driving after my drive unit replacement. The replacement was done recently so my guess is that I have a newer unit, and thus hope this will be my only replacement.

Thankfully for all of us, Tesla has a first class warranty and level of service. While it goes without saying that inconveniences such as this may happen, rest assured that Tesla has you covered and will always strive to make things right.

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"Rob's passion is technology and gadgets. An engineer by profession and an executive and founder at several high tech startups Rob has a unique view on technology and some strong opinions. When he's not writing about Tesla

Investor's Corner

Tesla just got a weird price target boost from a notable bear

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Credit: Tesla Manufacturing

Tesla stock (NASDAQ: TSLA) just got a weird price target boost from a notable bear just a day after it announced its strongest quarter in terms of vehicle deliveries and energy deployments.

JPMorgan raised its price target on Tesla shares from $115 to $150. It maintained its ‘Underweight’ rating on the stock.

Despite Tesla reporting 497,099 deliveries, about 12 percent above the 443,000 anticipated from the consensus, JPMorgan is still skeptical that the company can keep up its momentum, stating most of its Q3 strength came from leaning on the removal of the $7,500 EV tax credit, which expired on September 30.

Tesla hits record vehicle deliveries and energy deployments in Q3 2025

The firm said Tesla benefited from a “temporary stronger-than-expected industry-wide pull-forward” as the tax credit expired. It is no secret that consumers flocked to the company this past quarter to take advantage of the credit.

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The bump will need to be solidified as the start of a continuing trend of strong vehicle deliveries, the firm said in a note to investors. Analysts said that one quarter of strength was “too soon to declare Tesla as having sustainably returned to growth in its core business.”

JPMorgan does not anticipate Tesla having strong showings with vehicle deliveries after Q4.

There are two distinct things that stick out with this note: the first is the lack of recognition of other parts of Tesla’s business, and the confusion that surrounds future quarters.

JPMorgan did not identify Tesla’s strength in autonomy, energy storage, or robotics, with autonomy and robotics being the main focuses of the company’s future. Tesla’s Full Self-Driving and Robotaxi efforts are incredibly relevant and drive more impact moving forward than vehicle deliveries.

Additionally, the confusion surrounding future delivery numbers in quarters past Q3 is evident.

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Tesla will receive some assistance from deliveries of vehicles that will reach customers in Q4, but will still qualify for the credit under the IRS’s revised rules. It will also likely introduce an affordable model this quarter, which should have a drastic impact on deliveries depending on pricing.

Tesla shares are trading at $422.40 at 2:35 p.m. on the East Coast.

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Tesla coding shows affordable model details, including potential price

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Credit: @tslaming | X

Coding within Tesla’s website appears to have potentially revealed some details of the affordable model it plans to launch, including its possible price.

Although these details are unconfirmed by the company, recent sightings of the vehicle have sparked significant speculation as to what it will offer.

Tesla said a few months back that it had already successfully built the first few test units of the affordable model. CEO Elon Musk revealed later that it would essentially be a stripped-down version of the Model Y with a handful of changes.

We had our first look at what those changes appear to be, as what is likely the new affordable model was spotted on roads near Gigafactory Texas yesterday. It is a Model Y body with some Model 3 features.

It lacks the light bar that the new Model Y has and instead equips headlights similar to those of the Model 3 “Highland.”

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Affordable Tesla Model Y spotted without camouflage near Giga Texas

Other design changes appear to include no glass roof and new wheels. Some rumors have also indicated that Tesla plans to use a cheaper, textile interior, devoid of the flashy features that its other cars are equipped with, including no rear screen, no HEPA system, and manually adjustable second-row air vents.

However, coding within the Tesla website seemed to reveal some pretty significant details about the new affordable model, including its name, which differs from the E41 codename it was given, its price, and a complete list of features.

This was found by Tesla Newswire on X. Here’s what the coding showed for the car. Note that this was found in coding, and is not necessarily confirmation from Tesla regarding what it plans to offer:

  • Name – Model Y Standard
  • Price $39,990
  • Redesigned front fascia
  • Single-part headlights
  • Front bumper camera
  • No glass roof, noted as a “closed glass roof”
  • 18″ Aperture wheels
  • Manually adjustable steering wheel
  • Textile décor
  • 15.4″ front touchscreen
  • No second-row touchscreen
  • Manually adjustable air vents in the second row
  • No HEPA system
  • 75 cu. fu. cargo space

Here’s what the coding looked like:

Many believe these could be the specs and details of the new affordable model, but others think Tesla might be baiting the community. Tesla knows its fans well, and many of them are sharp enough to examine some of the core portions of its website, looking for clues.

The company is well aware that these breadcrumbs will be discovered, and could be putting anything to drive up interest and chatter about what it could release. It certainly seems as if the price tag is a tad high, which tends to push some skepticism about the coding.

However, we’ll take anything we can get at this point. It is important to note that this coding is not a confirmation of details from Tesla.

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Affordable Tesla Model Y spotted without camouflage near Giga Texas

The vehicle had clean lines and it looked sleek, though it was also notably simpler than the standard Model Y.

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Credit: Ryan Mable/X

The tea leaves seem to be pointing towards the imminent release of the highly anticipated affordable Tesla Model Y. This was hinted at in recent observations from notable Tesla influencers on social media, as well as a sighting of the vehicle without any camouflage.

The affordable Tesla uncovered

Sightings of the affordable Model Y have been abounding as of late, though details of the vehicle were still hidden by coverings on the vehicle. In a recent post on X from Firefly engineer Ryan Mable, however, noted Tesla influencer Sawyer Merritt has reportedly “spotted an uncovered cheaper Model Y variant” driving near Giga Texas. 

Several images of the uncovered vehicle were shared online. Based on the photos that were shared by Mable, the affordable Model Y seemed to feature a fascia that’s inspired by the Model 3 sedan. Its roof also looked blacked out. Overall, the vehicle had clean lines and it looked sleek, though it was also notably simpler than the standard Model Y.

Tesla influencer mystery

Interestingly enough, several Tesla influencers apart from Merritt posted that they were in Giga Texas. These included drone operator Joe Tegtmeyer, teardown specialist Sandy Munro, and reviewers Kyle Conner and Kim Java. These influencers have not provided any context behind their Giga Texas trip, though the fact that they were gathered on the site brought speculations that Tesla might have invited the group for a teaser or a private unveiling event of sorts.

It remains to be seen when the affordable Model Y would be made available, though conversations now are centered on the vehicle’s potential price. Previous reports suggested that the car might be priced just below $40,000, which many believe would result in very low sales, though some have also speculated that the affordable Model Y could be priced below $35,000, which would likely make it a strong seller.

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