Tesla’s Robotaxis Have a Strange New Rear Bar — Here’s What We Know

June 26, 2025

By Karan Singh

@DirtyTesLa on X

We’ve already seen that Tesla’s Project Halo has some hardware modifications not found on consumer cars. While some of these upgrades, like the second communications unit, have a clear purpose, another change is a bit more confounding.

Early-access testers in Austin spotted a simple, flat, likely metal bar under the rear trunk of the Robotaxi Model Ys. While we’re still not sure what exactly this new bar is for, we do have some speculative ideas.

The community has also floated some fantastic theories, but Tesla clearly put it here, and on these Robotaxi vehicles, for a specific purpose. Grab your notepads, we’re about to do some theorycrafting.

Could Be Wireless Charging

By and far, the most plausible and exciting theory is that this bar is related to future wireless charging capabilities and testing.

For a Robotaxi network to scale efficiently, the entire process, from cleaning to charging, must be autonomous. Relying on a human to plug in each vehicle, or even a complex robot arm, introduces a logistical bottleneck and a potential point of failure.

The logical endpoint here is that wireless inductive charging is a game-changer. A vehicle simply parks over a designated pad at the depot to begin charging, without any interaction.

The metal bar is in the exact spot where Tesla could potentially mount testing gear, or even the vehicle-side receiver for more informal testing, without needing to commit to a wholly new underbody design.

Tesla previously acquired Wiferion, a German inductive charging technology company, and demoed the wireless charging solution at We, Robot. With a series of patents on beam steering and wireless charging circuits, Tesla has been hard at work building up their tech base to support wireless charging for Robotaxi.

@DirtyTesLa on X

What It Probably Isn’t

We’ve seen several other theories discussed, but they really begin to fall apart under closer scrutiny.

The first is additional underbody protection. While it is potentially practical, the bar’s position is far too rearward to offer any additional protection to the high-voltage battery pack or the rear drive units. Additionally, Tesla prefers to integrate this type of protection directly into the vehicle’s Gigacasting. Tesla has already made significant improvements to the structural rigidity of the new Model Y’s Rear Casting, so this makes no sense.

Next up is a potential camera spray shield for the rearview camera. The centralized placement of the bar means it doesn’t actually protect from the rear wheels pushing road spray out and upwards. It simply won’t have an impact on the rear camera that we can see.

Rounding up the theory crafting is a new aerodynamic part. However, the bar is flat and seems more like a mounting point than anything aero-related, such as the new rear diffusers spotted on the Model Y Performance. The bar likely makes more drag than it reduces.

Small Part, Lots of Ideas

When considering the logistical requirements of a large-scale autonomous vehicle fleet, wireless charging is a natural choice, especially given the mounting point. This simple metal bar is likely a preparatory step for Tesla to mount engineering samples for wireless charging in the near future.

If you’ve got any other ideas on what this could be, we’d love to hear what you think on social media.

Tesla’s ‘Project Halo’ Revealed: The Upgraded Model Ys Behind the Robotaxi Network

June 26, 2025

By Karan Singh

@DirtyTesLa on X

While the performance of FSD has been the star of the Robotaxi Network, new details are emerging about Tesla using modified Model Ys for the service. According to a report from Business Insider, the program to modify some vehicles for Robotaxi is known internally as “Project Halo”, and it involves more than just a newer FSD version.

These details help connect the dots between the subtle physical changes that have been spotted on the Robotaxi Model Ys.

Physical Clue: Expanded Rear Housing

Eagle-eyed observers in Austin were quick to spot a key physical difference on the Robotaxi fleet vehicles: a larger-than-normal housing on the rear window. This immediately sparked speculation that Tesla had integrated new components to support the Robotaxi rollout. We initially expected that these may have been minor changes like Tesla is known to roll out, but now we have a better idea of what exactly is under that new housing.

Halo Communications Unit

According to the insider source, Tesla’s Halo vehicles are equipped with a second telecommunications unit. That’s a significant change from customer vehicles, which are equipped with just a single unit near the roof of the vehicle.

According to the report, this unit serves a dual purpose. It provides redundant, high-precision GPS data, and most importantly, allows the vehicle to maintain a constant, reliable connection with Tesla’s Robotaxi support team. That includes connectivity for teleoperation, if necessary. This hardware may be the physical backbone for the human assistance portion of the pilot phases of Robotaxi.

As we saw in the command center image shared by Ashok Elluswamy, these vehicles are streaming video from six cameras, potentially putting too much of a strain on the vehicle’s single cellular modem.

Not a Tesla App

Probably Not Starlink

While we initially mused that this could be holding a Starlink Mini dish, the space taken up by the housing is far too small to permit the installation of a Mini. Instead, it is approximately the same size as the telematics control unit that Tesla installs in the ceiling of its newer vehicles, which include a 5G modem.

Tesla is likely using the second connection for redundancy or to increase data throughput.

Quickly Iterating on FSD

All that data throughput likely serves a third purpose as well - providing live data streaming for Tesla’s Robotaxi Operations Hub back at Gigafactory Texas. That isn’t necessarily for support teleoperations, as we previously mentioned.

It is likely that Tesla is pulling video data from the Robotaxis to quickly improve the current version of Unsupervised FSD. Early-access testers noticed that in just a day, Tesla was issuing improvements, which means data is moving from vehicle to training in a snap.

Yesterday robotaxi would get like an inch away from this wall (first video) while pulling up. I saw 4 different Robotaxis do it.

Today it seems fixed. I've seen 2 robotaxis. Is Tesla really changing things this quickly? pic.twitter.com/zfdchBL771
— Dirty Tesla (@DirtyTesLa) June 24, 2025

But Elon Said!

Well before the launch, Elon said that the vehicles used for Robotaxi would be unmodified vehicles coming straight from the factory. It seems that isn’t exactly true, but it could be in the future.

So, how can we reconcile the unmodified statement with the clear evidence of Project Halo hardware? The key here lies in the difference between a stock Tesla’s FSD capabilities, versus the operational hardware required to run a commercial Robotaxi service.

Elon’s entire point is that the fundamental FSD hardware — the cameras, sensors, and FSD computer — is standard on every car coming off the line. From a capability standpoint, a consumer car can perform Unsupervised FSD.

The second communications unit is best understood as service hardware. They don’t make the car drive better, but they provide the redundant connectivity needed for operational oversight, remote assistance, and the massive data uploads required for a pilot program.

This hardware may also be necessary for Tesla to meet regulatory compliance requirements for a commercial autonomous vehicle service for the foreseeable future.

These are unmodified Tesla cars coming straight from the factory, meaning that every Tesla coming out of our factories is capable of unsupervised self-driving! https://t.co/n94ln0Uas6
— Elon Musk (@elonmusk) June 10, 2025

Camera Cleaning

The Business Insider report also mentioned that Halo vehicles would have self-cleaning cameras. That isn’t a new hardware feature; in fact, it appears to refer to the software feature where Robotaxis can thoroughly clean its front-facing cameras [video and details], which will eventually make its way to owner vehicles.

Wrapping Up

The insider confirmation of Project Halo and its specialized hardware helps to provide a clearer picture of exactly what Tesla is doing with Robotaxi. It seems that for now, it’s not simply just consumer cars running advanced hardware, it’s a fleet of very lightly purpose-modified vehicles meant to support the pilot rollout.

Tesla’s Robotaxi Easter Egg: Surprise Tip

June 25, 2025

By Karan Singh

BLKMDL3

Tesla has always embraced whimsy in its software, packing it with playful Easter eggs and surprises. From transforming the on-screen car into James Bond’s submarine to the ever-entertaining Emissions Testing Mode and the fan-favorite Rainbow Road, these hidden features have become a signature part of Tesla’s software.

Of course, launching a new product like Robotaxi wouldn’t be complete without a fun little easter egg of its own. The end-of-ride screen in the Robotaxi app presents a familiar option “Leave a tip.”

For anyone pleased with their Robotaxi ride, they may be tempted to leave a tip. However, tapping the button presents our favorite hedgehog instead of a payment screen.

The app displays a message, alongside the familiar Tesla hedgehog, that simply states “Just kidding.”

Tesla’s Robotaxi Easter Egg: Surprise Tiphttps://t.co/EAIFZ5bdQR https://t.co/3IokgEaFJv pic.twitter.com/GjDnDiHDGo
— Not a Tesla App (@NotATeslaApp) June 25, 2025

While it's a fun prank, it’s also a nod to what Tesla really wants to do. They want to reinforce the economic advantage of an autonomous Robotaxi Network. Without a driver, there is simply no need to tip. The gesture is playful, but it’s a reminder of what Tesla’s real aim is here.