Tesla previously told its employees on the Cybertruck production line that work would be halted for three business days and that they would not be required to show up to Giga Texas for any other work. Work was halted on the Cybertruck line from December 3rd until December 6th.
Many speculated that Tesla had hit a demand mark with the Cybertruck or run into other production-related difficulties. However, pausing production for such a short period is a fairly normal business operation, as Tesla continuously retools and upgrades its production lines.
Halts for business demand tend to look more similar to Ford’s F-150 Lightning production halt - where they halted production from November 18, 2024, until January 6, 2025. Ford also announced that this production halt was due to reduced demand for its electric truck in the face of stiffer competition.
Cybertunnel
In this case, part of the reason for the halt could potentially have been due to upgrades to the underground tunnel that is used to move Cybertrucks fresh from the production line to the holding lot at Giga Texas. Tesla has been working on improving the production flow rate for its vehicle - and rather than encountering issues with production, they’ve previously mentioned they’ve had issues with getting vehicles out of their outbound parking lots and off their assembly lines - and into customers’ hands fast enough.
The Cybertunnel moves trucks from inside Giga Texas to the holding lot just outside the factory. At that holding lot, they’re either loaded into trains or trucks to be transported across North America. The tunnel passes underneath Texas Highway 130, helping to ensure that Tesla isn’t clogging up traffic crossing the highway with brand-new trucks.
More Shut Downs?
It’s likely we’ll see even more shutdowns at Giga Texas in the coming months. Tesla has shown that it intends to continue increasing production rates at Giga Texas, which means it will need time to upgrade its assembly lines and processes. In addition, the Model Y is also produced at Giga Texas—and once the Model Y Juniper arrives, there will need to be shutdowns to accommodate re-tooling.
So, no need to stress - it's just regular operations. And we get to see a cool Cyber-themed tunnel too. In the meantime, check out Joe Tegtmeyer’s drone video of Giga Texas below.
Giga Texas on this cold 6 December 2024 morning! Big news with the @boringcompany paving & tunnel covering structure on W side, new mystery construction on W side of GA, continued work on SW corner for tunnel alternate exit & production of both @cybertruck & Model Y today,… pic.twitter.com/94a894ix1I
While most automakers are adding basic and un-integrated AI assistants to their vehicles, Tesla appears to be working hand-in-hand with xAI to build out an entire cast of characters for in-vehicle Grok. In the latest dive into Tesla’s firmware, Tesla hacker @greentheonly uncovered a few new details about the upcoming Grok feature.
This discovery, part of a larger batch of changes found in Tesla update 2025.20, also offers a hint at the hardware required for the Grok.
A Dozen Groks
While we knew from previous firmware teardowns that Tesla was adding various Grok personalities to the vehicle UI, this update introduces a new one called Language Tutor, which may allow users to learn and practice a new language.
These are the different personas that will be included in Grok:
Argumentative
Assistant
Conspiracy
Doctor
Kids’ Stories
Kids’ Trivia Games
Meditation
Motivation
Romantic
Sexy
Storyteller
Therapist
Language Tutor
and the Grok Classic - Unhinged Mode
Release Date
Icons for these personalities have been added to the firmware for the first time, leading us to think Tesla is getting close to releasing the feature. However, even after the feature is developed and included in vehicle software, Tesla may only enable it selectively — such as for select employees for testing.
Grok is expected to be one of the largest vehicle features added via a software update, so it’ll be a big deal when it’s finally released. While we know more or less what to expect from Grok, what we don’t know is about vehicle requirements or whether it’ll require a subscription beyond Premium Connectivity.
Grok Requirements
While subscriptions required are anyone’s guess, vehicle requirements may be a little clearer now, thanks to Green’s discovery that Grok is only being added to AMD-based vehicle software builds.
Unfortunately, this likely means that older, Intel-based vehicles will not receive Grok support, at least for the time being. When Tesla introduced a voice assistant in China, they also started off with AMD-only support but later added Intel support, so it’s possible that the same could happen with Grok.
Energy Saving
Green also found a new undocumented navigation feature in 2025.20.3. This one focuses on leveraging Tesla’s vast amounts of data in an interesting way and offers drivers proactive advice to save energy on a well-traveled route.
In the Energy App, your vehicle will display, “This route is typically driven at X mph. Slow down by Y mph to save Z% for the rest of this trip.’
As you can see in the photo below, Tesla recognizes that vehicles typically drive at 66 mph on the route being driven and offers the driver the option to go five mph slower to save 1% of range. While this example doesn’t provide much incentive to slow down, it could be useful for someone with a low state of charge or if the savings are more significant.
The new line in the Energy App
Not a Tesla App
In the future, Tesla could even use this, alongside the road surface data they’re gathering, to help plan routes for Robotaxi and Unsupervised FSD.
In a letter to industry, the National Highway Traffic Safety Administration (NHTSA) has announced that it is overhauling its approvals process for vehicles designed without human controls.
The change addresses a regulatory bottleneck that has slowed down American companies like Tesla from deploying purpose-built Robotaxis, rather than relying on using traditional vehicles with steering wheels and pedals. The policy shift is outlined in a letter posted to the NHTSA’s website, which you can find here.
Reducing Approvals From Years to Months
Under the existing rules today, any vehicle that is built without a steering wheel or brake pedals must receive a special exemption from federal safety standards.
Obtaining exemptions for a particular vehicle was a time-consuming process for both the companies requesting exemptions and the NHTSA. The process was often a black box—nobody knew when an exemption might be granted, and approvals could take years.
The NHTSA, under the new administration’s guidelines for autonomous vehicle development, is now committed to streamlining this process. The agency will be implementing a new, faster approach immediately for receiving exemptions for autonomous vehicles without standard controls. The NHTSA expects decisions on exemption requests to be determined within months rather than years.
Accelerating the Cybercab
This change has massive implications for Tesla, which is banking on the production of the simplified and easy-to-maintain purpose-built Cybercab. The Cybercab is developed from the ground up as an autonomous Robotaxi and will be one of the key beneficiaries of this move by the NHTSA.
Knowing that a final design won't be caught in a multi-year regulatory limbo provides a level of certainty that has been missing. It allows Tesla to confidently plan the manufacturing, development, and deployment processes without worrying whether the project will get stuck in regulatory approvals.
According to the letter, the agency will publish its improved instructions for the streamlined process "shortly." With Tesla already having begun Cybercab pre-production and the goals for its deployment as soon as late 2026, there’s still a lot to be done to make autonomy a part of Tesla’s new sustainable abundance mission statement.
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