Tesla quietly included a cabin radar in its vehicles for several years before recently activating it through software update 2025.2. Tesla now uses the interior radar for several features, and later this year will add additional features that take advantage of the interior radar.
Cabin Radar Features
The first feature Tesla developed that uses the cabin radar is front row cabin sensing. Instead of relying on sensors in the seats to detect occupancy, Tesla now uses the radar to determine where people are sitting in the vehicle. The radar is much more accurate than a seat sensor, so not only will it prevent false positives that occur when placing a heavy object on the passenger seat, but it could also improve reliability by reducing the number of parts in the vehicle.
In future updates, Tesla intends to expand the occupancy sensing to the rear of all of its supported vehicles, which will help improve vehicle safety by correctly deploying airbags as needed on a dynamic basis.
Regular Radar vs 4D Radar
The 4D radar is Tesla’s latest iteration of the radar, which is capable of even more sensing features. While many of these features are still a work in progress and haven’t been enabled, we recently covered what’s coming for the cabin radar. For now, these 4D radars are limited to the Cybertruck and the refreshed Model Y, but Tesla intends to expand the 4D radar to other vehicles as parts become available. Older vehicles include a different part number for the cabin radar, but it’s not clear if or how that will affect upcoming cabin radar features.
Upcoming Cabin Radar Features
In Q3 2025, Tesla intends to add child-presence detection, as well as health-detection for critical emergencies. In short, the radar is a safety-focused addition and will be able to help protect an individual left behind in a vehicle.
In addition to child detection, the radar will also determine passenger sizes to dynamically determine which airbags to deploy, which can help reduce airbag injuries for shorter individuals sitting in the front seats.
The radar can automatically note if a child or baby is left behind in the vehicle and will notify you via the Tesla app immediately. It will also turn on the HVAC system to ensure their safety. In the case of an emergency, the vehicle can also automatically call emergency services in some cases and even report its location.
As a reminder, while Tesla vehicles outside of the United States support eCall, vehicles within the US cannot call 911 unless a phone is connected to the vehicle via Bluetooth. We hope that Tesla looks to add similar capabilities in North America to improve safety capabilities.
Which Vehicles Have Cabin Radars?
Tesla’s more recent lineup of vehicles includes cabin radars, but this isn’t an exact science, and we’ll explain why a bit further below.
Tesla includes the cabin radar on the 2024+ Model 3 and some 2022+ Model Ys. It’s also included on all refresh Model Ys, the Cybertruck and some 2021+ Model S and Model X vehicles, however, the exact hardware version of the cabin radar does differ between models. While there are different hardware versions for the cabin radar, it’s not clear whether all hardware versions will support all features in the future.
To complicate things further, some pre-refresh Model Ys (late 2022+) are already equipped with the cabin radar, while others are receiving a notice from Tesla to come in and have the radar installed. This is due to Tesla using the radar for driver and passenger occupancy sensing.
As such, some older Model Ys and Model 3s may either be equipped with the cabin radar or may receive a notification from Tesla to have it equipped to address the occupancy sensor recall.
Model S and Model X vehicles manufactured from approximately September 2024 should also include the cabin radar sensors, but it’s best to check to be sure. We’ve got some instructions below on how to do just that.
How to Check If You Have a Cabin Radar
There’s actually an easy way to check whether your vehicle has a cabin radar. To do this, you’ll need to enter Tesla’s Service Mode, which is aimed at technicians, but it’s perfectly safe to do so as long as you exit it before driving and don’t change any settings.
If you’re not sure how to access Service Mode, check out our Service Mode guide that will walk you through the process. Once you’re in Service Mode, use the menu on the left to navigate to the Safety & Restraints section and thenchoose Seats.
You’ll be presented with the seats panel that shows passenger occupancy. Between the two front seats, you’ll see a green box below or above the virtual screen. Tap on it and it’ll either say Restraints Control Module (RCM) or Cabin Radar (ICR).
Location of Cabin Radar
Not a Tesla App
On supported vehicles, the cabin radar is located between the two front seats above the rearview mirror.
Future Features
We expect Tesla to continue to develop features that rely on the vehicle’s cabin radar. Dog Mode, for instance, could be turned on automatically if you leave your pooch inside the vehicle and fail to turn on Dog Mode. Tesla can also trigger the rear HVAC fan even when the seat occupancy sensor isn’t triggered, which happens regularly with child seats.
Tesla is also expected to stop including seat sensors in every seat and instead rely on the cabin camera to detect passengers, reducing the cost of each vehicle. As with other Tesla features, new feature ideas on how to leverage the cabin sensor will come later as owners and product owners think of other clever uses for the new hardware.
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Tesla’s Dan W Priestley attended the Advanced Clean Transportation (ACT) Expo in Anaheim, California, and provided an update on Tesla’s Semi truck program. The presentation covered several key developments on the status of Tesla’s Nevada Semi Factory, refinements to the Semi, and Tesla’s plans for charging and ramping production through 2026.
Let’s dig in and take a look at everything that was captured by the Out of Spec team at ACT Expo. The original video is embedded below if you’d like to watch it.
Semi Factory & Production Ramp
Priestley reaffirmed the timelines mentioned during Tesla’s Q4 2024 Earnings Call that Tesla will scale Semi production in 2026. To achieve this, Tesla has been actively building and expanding the Gigafactory Nevada site, specifically to support the production of the Tesla Semi. The dedicated Semi facility will have a targeted annual capacity of 50,000 Semi trucks.
Following the beginning of production, Tesla will utilize the initial trucks to integrate into its own logistics operations. This will serve as both a final real-world testing ground as well as an opportunity for Tesla to gather data internally. Tesla plans to begin subsequent customer deliveries throughout 2026 as the ramp-up continues.
Reuters also reported that Tesla is hiring over 1,000 new employees at the Semi Factory to begin the rapid ramping of the program.
Semi has already amassed 7.9 million miles with Tesla’s current testing and operational fleets, providing some real-world data and testing. Feedback for the truck has been exceptionally successful, with many drivers praising the Semi’s performance and comfort.
New Tesla Semi Features
Of course, it wouldn’t be a Tesla keynote without showing off some new things. The Semi will be available in 500-mile and 300-mile range configurations, now featuring updated mirror designs and a drop-down glass section to improve visibility and allow easier interaction with external elements—such as control panels at ports, for example.
New Electric Power Take-Off (e-PTO)
The Tesla Semi will also feature a new capability called Electric Power Take-Off, or e-PTO system. Similar to the PTO systems found on other vehicles, this will allow the Semi’s high-voltage battery to power auxiliary equipment at variable voltages. That includes being able to power things like climate-controlled reefer trailers, potentially replacing the noisy and polluting diesel generators traditionally used for this purpose.
Charging and Batteries
Out of Spec BITS/YouTube
Tesla is also working on an updated battery pack design for the final production design of the Semi. This new pack is designed to be more cost-effective to manufacture. The battery pack itself is slightly smaller than before, but the truck maintains the same level of range through efficiencies. Dan also confirmed during his keynote that the battery cells for the Semi will be sourced domestically inside the United States, helping to alleviate potential burdens due to tariffs.
On the charging front, Tesla is using MCS - the Megawatt Charging System - capable of 1.2MW - and designed specifically for Semi. The system uses the same V4 charging hardware found at Supercharger sites but focuses on that larger power output. Alongside a smaller physical footprint, Tesla will be able to configure these V4 cabinets for either dedicated Semi charging or for shared power scenarios with regular Superchargers. Tesla is also working on an integrated overnight charging product, but Tesla isn’t ready to talk about it yet.
46 Semi Charger Sites Coming
The 46 new MCS sites coming soon.
Out of Spec BITS/YouTube
Finally, Tesla has made substantial investments in a public charging network for the Semi. There are currently 46 sites in progress throughout the United States, and plans for significant expansion throughout 2026 and 2027. These sites are strategically located alongside major truck routes and within industrial areas to support long-haul and regional operations. Tesla is aiming to offer the lowest possible energy costs to operators to help incentivize adoption.
This was one of the best updates to the Tesla Semi we’ve received since its initial unveiling. It seems that the Semi will receive a big portion of Tesla’s attention in 2026, while Robotaxi and FSD Unsupervised take the stage this year.
The Tesla Semi has the potential to transform transportation even more dramatically than EVs already have, serving as a testament to Tesla’s mission to electrify the world.
Sentry Mode is an invaluable tool for owners - capable of keeping the vehicle safe and secure even when you’re not around. This is especially true in recent times, with the misguided and unfortunate incidents surrounding Tesla ownership, including damage to Tesla vehicles, showrooms, and Superchargers.
B-pillar Camera Recording and Dashcam Viewer
With the 2025 Spring Update on 2025.14, Tesla is expanding Sentry Mode’s functionality for certain vehicles with some much-needed changes. Sentry Mode and Dashcam can now record footage from the vehicle’s B-pillar cameras. These cameras are located on the side pillars of the vehicle, between the front and rear doors.
This adds two crucially needed viewpoints, making Tesla’s Sentry Mode a truly 360-degree security system. These cameras also provide the best angles for capturing license plates when parked, so they will be greatly appreciated by owners in the event of an incident.
These vehicles are also receiving an improved Dashcam Viewer, which now displays the six camera feeds along the bottom and a new grid view. It also allows users to jump back or forward in the video in 15-second increments.
However, to the disappointment of many owners, not all vehicles are receiving these updates due to the additional processing power needed.
Limited to Hardware 4 Vehicles, Ryzen Isn’t Enough
We have confirmed that Tesla is only adding the additional camera recording and improved Dashcam Viewer on hardware 4 (HW4 / AI4) vehicles. The newer hardware presumably has the additional processing power and bandwidth needed to handle recording and saving the two additional video streams during Sentry Mode and Dashcam.
For the time being, owners of HW3 vehicles are not receiving this feature. This includes all vehicles with HW3, even those with AMD Ryzen infotainment systems. If you’re not sure whether your vehicle has HW3 or HW4, you can refer to our FSD hardware guide.
While there’s no doubt that recording two additional camera streams would be more computationally intensive, we hope that Tesla adds the improved Dashcam Viewer to HW3 vehicles in a future update.
Cybertruck Also Missing Improved Sentry Mode
Surprisingly, and most confusing for many - is the fact that the Cybertruck is also not receiving the improved Dashcam Viewer and B-pillar camera recording with this update. This struck us as odd, especially since the Cybertruck is currently the only vehicle with the improved, more efficient version of Sentry Mode.
Every Cybertruck is equipped with HW4 and AMD Ryzen infotainment units, so this clearly isn’t a hardware restriction. It’s possible the more efficient Sentry Mode is playing a role here due to the infrastructure changes. However, we expect Tesla to address this in a future update and eventually release these features for the Cybertruck as well.
Given the Cybertruck’s high visibility and its status as a frequent target for both positive and negative attention, many owners hoped that the Cybertruck would be one of the vehicles to receive this feature.
Adaptive Headlights
Tesla finally started rolling out its adaptive headlights in North America. While the new Model Y already came with the feature when it was released last month, other vehicles with matrix headlights are now receiving the feature in the Spring Update.
All vehicles with matrix headlights are receiving this feature, which includes the new and old Model 3, first-gen Model Y, and the new Model S and Model X.
If you’re not sure if your vehicle includes matrix headlights, check out our guide. What’s interesting here is that older vehicles that were retrofitted with matrix headlights due to an accident or user replacement are also receiving the adaptive headlights feature.
Legacy Model S & Model X
As with most updates, the older legacy Model S and Model X are not receiving all the features included in this update. Unfortunately, some of the features, which include the Blind Spot Camera on the instrument cluster, Save Trunk Height Based on Location and Keep Accessory Power On are limited to the new Model S and X.
Legacy S and X models will receive the Alternative Trip Plans feature, Avoid Highways (Requires Intel MCU) and the Keyboard Languages feature.
These vehicles are also receiving all the features in the Minor Updates section except for the visualization showing how far the door is opened, which is exclusive to the Cybertruck. These additions include improved music search results, contact photos in the phone app, automatic connecting to hotspots, the ability to show third-party chargers, view Supercharger amenities, and various improvements to music services.
While many users will be disappointed not to receive the B-pillar camera recording and Dashcam Viewer improvements, it’s important to remember that Tesla typically does a great job at bringing features to older vehicles, at least with the Model 3 and Model Y. If a feature isn’t added, it’s usually due to a hardware limitation.
![Tesla Semi Keynote: New Features, 46 Charging Sites, Upgraded Battery & More [VIDEO]](https://www.notateslaapp.com/img/containers/article_images/semi/semi-new-features.jpg/c7df4e0d32f8cb0beee080ad201e943b/semi-new-features.jpg)
