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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 receives major institutional boost with Nomura’s rising stake

The move makes Tesla Nomura’s 10th-largest holding at about 1% of its entire portfolio.

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Credit: Tesla China

Tesla (NASDAQ:TSLA) has gained fresh institutional support, with Nomura Asset Management expanding its position in the automaker. 

Nomura boosted its Tesla holdings by 4.2%, adding 47,674 shares and bringing its total position to more than 1.17 million shares valued at roughly $373.6 million. The move makes Tesla Nomura’s 10th-largest holding at about 1% of its entire portfolio.

Institutional investors and TSLA

Nomura’s filing was released alongside several other fund updates. Brighton Jones LLC boosted its holdings by 11.8%, as noted in a MarketBeat report, and Revolve Wealth Partners lifted its TSLA position by 21.2%. Bison Wealth increased its Tesla stake by 52.2%, AMG National Trust Bank increased its position in shares of Tesla by 11.8%, and FAS Wealth Partners increased its TSLA holdings by 22.1%. About 66% of all outstanding Tesla shares are now owned by institutional investors.

The buying comes shortly after Tesla reported better-than-expected quarterly earnings, posting $0.50 per share compared with the $0.48 consensus. Revenue reached $28.10 billion, topping Wall Street’s $24.98 billion estimate. Despite the earnings beat, Tesla continues to trade at a steep premium relative to peers, with a market cap hovering around $1.34 trillion and a price-to-earnings ratio near 270.

Recent insider sales

Some Tesla insiders have sold stock as of late. CFO Vaibhav Taneja sold 2,606 shares in early September for just over $918,000, reducing his personal stake by about 21%. Director James R. Murdoch executed a far larger sale, offloading 120,000 shares for roughly $42 million and trimming his holdings by nearly 15%. Over the past three months, Tesla insiders have collectively sold 202,606 shares valued at approximately $75.6 million, as per SEC disclosures.

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Tesla is currently entering its next phase of growth, and if it is successful, it could very well become the world’s most valuable company as a result. The company has several high-profile projects expected to be rolled out in the coming years, including Optimus, the humanoid robot, and the Cybercab, an autonomous two-seater with the potential to change the face of roads across the globe.

@teslarati Tesla Full Self-Driving yields for pedestrians while human drivers do not…the future is here! #tesla #teslafsd #fullselfdriving ♬ 2 Little 2 Late – Levi & Mario
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Tesla rolls out fresh Supercharger pricing strategy to more locations

Live Pricing aimed to resolve some of the shortcomings of the off-peak and on-peak system, aiming to keep prices low and base them on current utilization instead of a set time when prices change.

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tesla supercharger
Credit: Tesla

Tesla has rolled out a fresh Supercharger pricing strategy to more locations, as it confirmed it has added 550 additional sites in the United States to its “Live Pricing” strategy.

Live Pricing for Superchargers launched back in May, and was the company’s latest strategy to keep charging your EV cheap, affordable, and easy to understand.

Tesla has adjusted its pricing strategy at Superchargers several times over the past few years, with the most notable being the 2020 introduction of off-peak and on-peak Supercharging rates.

Live Pricing aimed to resolve some of the shortcomings of the off-peak and on-peak system, aiming to keep prices low and base them on current utilization instead of a set time when prices change.

Tesla explained the program when it launched:

“We are piloting on-peak and off-peak pricing based on live Supercharger utilization rather than estimations. The average price remains unchanged, but this live feedback loop improves accuracy. This corrects off-peak pricing during times of congestion, or on-peak pricing when Superchargers are plentiful. You’ll always see the price before your session begins, and prices do not change mid-session. A small-scale pilot is launching at 10 sites and will expand based on feedback and success.”

The initial rollout only included Superchargers in California, but it was not all of them, only a handful instead. Tesla was attempting to launch it in a very controlled manner by using a Pilot Program that would iron out all the early bugs and potential issues it might run into.

However, the company expanded the program by launching it at an additional 550 sites in California, New Jersey, New York, Florida, and Illinois:

The price you pay is locked in when you plug in, so if the Supercharger station you are charging at becomes more crowded and the program bumps up the rates because of high utilization rates, you will still receive the cheaper price that was enabled when you arrived.

@teslarati With a pedestrian in the crosswalk, Tesla Full Self-Driving shows off its courtesy. Human drivers? Not so much. #tesla #teslafsd #fullselfdriving ♬ AMERICAN HEART – Maxwell Luke

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Tesla Robotaxi was just spotted in a new state for the first time

The company is still attempting to expand and has explicitly stated that it plans to offer rides in Nevada, Arizona, and Florida in the near future. However, a pair of Robotaxi mules, fitted with LiDAR equipment for ground truth validation, was spotted in a new region for the first time.

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Credit: Tesla

Tesla Robotaxi mules were spotted in a new state for the first time as the company plans to expand the ride-sharing service to new areas of the United States in the coming months.

Tesla is offering Robotaxi rides in Austin already, where nobody is present in the driver’s seat except for on freeway routes. In California, Tesla refers to its platform as a ride-hailing suite, and a “Safety Monitor” is present in the driver’s seat at all times, but the vehicle operates on Full Self-Driving.

The company is still attempting to expand and has explicitly stated that it plans to offer rides in Nevada, Arizona, and Florida in the near future. However, a pair of Robotaxi mules, fitted with LiDAR equipment for ground truth validation, was spotted in a new region for the first time.

Over the weekend, Tesla Robotaxi mules were spotted in Enola, Pennsylvania, just about ten minutes from downtown Harrisburg:

Enola is situated to the northwest of Harrisburg, Pennsylvania’s State Capitol. Interestingly, you’d expect Tesla to be testing these types of vehicles in other, more populated areas; Philadelphia is about two hours East, and Pittsburgh is about three hours west. State College is about an hour North of Enola.

Looking at the location of where the vehicles were spotted tells an interesting story, as Enola, located right outside of the State Capitol, could be a move to nudge legislators to consider looking at some of the laws that deal with driverless and autonomous vehicle operation.

Pennsylvania’s Act 130 of 2022 and subsequent guidelines permit the testing of driverless vehicles in the Commonwealth, but PennDOT requires a permit from Tesla or any other company that wants to operate a ride-hailing service in PA.

It’s also important to note that the cars could have simply been stopping through, as they were spotted at a Supercharger location along Interstate 81, which spans from Tennessee to New York.

It is not to say the vehicles are testing along the entire route, but likely a segment of it. The fact that they were spotted in Pennsylvania does bode well for Tesla’s expansion efforts moving forward.

@teslarati Tesla Full Self-Driving yields for pedestrians while human drivers do not…the future is here! #tesla #teslafsd #fullselfdriving ♬ 2 Little 2 Late – Levi & Mario

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