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Tesla Semi faces new wave of skepticism from diesel veterans
There is very little doubt that the Model S, Model X, and Model 3 have disrupted their respective segments since they were released. Tesla aims to accomplish the same thing with its all-electric Semi truck, but the vehicle’s target is a lot more ambitious — it aims to disrupt the trucking industry.
The trucking industry is vast, and it is still growing. Long-haul trucking stands is the lifeblood of the US economy, handling the transportation of up to 71% of food, retail goods, construction supplies, and other cargo delivered every day. The American Trucking Associations’ American Trucking Trends 2018 report revealed that the US trucking industry generated $700.3 billion in economic activity in 2017, representing a 3.5% increase compared to 2016 when the trucking market generated $676.6 billion. This is the market that Tesla is aiming to tap into with the Semi.
One of the Tesla Semi’s main selling points is that it’s an environmentally-friendly vehicle. Being all-electric, the Semi is a zero-emissions truck. This is an advantage over conventional diesel trucks, which are a significant source of air pollution in the United States. According to the Environmental Protection Agency, greenhouse gases from medium and heavy-duty trucks were found to have increased by 85% between 1990 to 2016, accounting for about 23% of carbon emissions from transportation in 2016. This is despite the fact that diesel engines are getting steadily cleaner. The EPA estimates that emissions from current engines are about 85% lower than before 2007 when the US rolled out new standards.
The Tesla Semi has several features that make it a viable alternative to diesel-powered long-haulers, from its four Model 3-derived electric motors, its comparable Class 8 hauling capacity, and its superior speed. That said, it appears that America’s diesel veterans would not give up without a fight. In a statement to Bloomberg, Jon Mills, a spokesman for engine maker Cummins Inc. noted that electric trucks have a long way to go before they could be considered competition for diesel trucks.
“Right now, we don’t think it’s viable. Electric trucks are more viable where you have shorter routes, less loads and you’re able to recharge,” he said.
Cummins Inc. is one of America’s premier engine-makers, supplying engines for consumer trucks, fire engines, and heavy-duty long-haulers. Most of the company’s engines run on diesel, though they are also making some that operate on natural gas. Mills noted that Cummins is developing electric motors as well, but the company does not expect a lot of demand for them anytime soon.
Mills did admit that electric trucks would contribute to reducing pollution. Nevertheless, the Cummins Inc. spokesman noted that the trucking industry is likely not ready to switch to electric, mainly since vehicles like the Tesla Semi have limited range. Considering that some truck drivers are paid by the mile, they would likely lose money while waiting for their vehicles’ batteries to recharge.
“Diesel will be the primary option for heavy duty trucking markets, long haul especially, for a decade or more,” Mills said.
Elon Musk wants to initiate the transition sooner. When unveiling the Tesla Semi’s specs, Musk noted that the electric long-hauler would be cheaper to operate than comparable diesel-powered trucks. Musk noted that the Semi could cost operators $1.26 per mile to run, less than the standard $1.51 per mile that diesel-powered vehicles cost. That said, Allen Schaeffer, executive director of the Diesel Technology Forum trade group, is skeptical of Musk’s claims, noting that there is little need for a new entrant in the shipping industry.
“It’s easy if you’re just coming into this market to say ‘they’re $1.50 per mile and we can do it for $1.20. But where’s the proof? I haven’t seen it. Diesel is the benchmark for energy efficiency. Diesel dominates the entire sector,” he said.
Amidst continued reservations from veterans in the trucking industry, Tesla is nonetheless pushing through with further development of the Semi. The company has been conducting real-world tests of the Semi since the vehicle was unveiled, and during the Q2 2018 earnings call, Elon Musk noted that improvements to the truck are being made. Thus, when the Tesla Semi enters production, the long-hauler would be an even more viable alternative to diesel-powered trucks.
“We’ve made significant improvements to the design since the unveiling that we had, and it’s really even better than what we talked about,” Musk said.
Turn-by-turn navigation is not new technology.
For over two decades, drivers have relied on Garmin, TomTom, and later smartphone apps like Google Maps and Waze to receive precise, reliable directions. These systems have guided millions safely through unfamiliar cities, highways, and backroads with remarkable effectiveness. They handle real-time traffic, construction detours, and complex intersections with minimal fuss.
Yet Tesla, the company that promised revolutionary Full Self-Driving (FSD), continues to struggle with this foundational capability. As FSD (Supervised) v14.3.4 has started rolling out to cars this week, navigation remains its glaring Achilles’ heel, undermining the entire autonomous vision.
Tesla Summon got insanely good in FSD v14.3.2 — Navigation? Not so much
Tesla’s FSD excels in many driving behaviors—smooth acceleration, confident lane changes in ideal conditions, and responsive handling of visible obstacles. However, when it comes to following a route accurately, the system falters repeatedly.
Owners report wrong turns, missed exits, inefficient routing through local roads instead of highways, phantom speed limit errors, and even directing vehicles to building rear entrances. Interventions for navigation issues often outnumber those for core driving maneuvers. Tesla has begun surveying owners specifically about these errors, acknowledging the problem after years of complaints.
Navigation is perhaps my biggest complaint when it comes to FSD, because sometimes, we do know better. Some of us have been living in our areas for our entire lives, but even those who have not have years or even decades of experience driving on local roads. We might know a little better about routing.
But the navigation mistakes are more than just FSD potentially taking a slightly different route that may or may not save you a few minutes. Sometimes, they’re genuinely mind-boggling.
This isn’t just annoying; it cascades into broader failures. A flawed route plan confuses the AI’s decision-making, leading to hesitant behavior, unnecessary disengagements, or dangerous maneuvers like attempting impossible U-turns or ignoring clear ramps. In a system meant to operate with minimal supervision, unreliable navigation erodes trust.
More often than not, false or plain incorrect navigation is what causes me to interrupt FSD operation. Unfortunately, I believe the latest FSD version is the worst example of it, and it leads me to believe that Tesla might be making some changes; they’ve just made them in the wrong direction.
It makes you wonder: Why is a company that has done so much with the progress of FSD and autonomy struggling so much with navigation, something that is not new and has been around a long time?
Multiple Data Sources
First, Tesla’s navigation relies on a fragile patchwork of multiple data sources—Google Maps, TomTom, OpenStreetMap, Valhalla, and its own fleet-derived data—stitched together rather than a single authoritative map. When these conflict on lane geometry, road status, or turn details, the system hesitates or chooses incorrectly.
Traditional GPS providers maintain centralized, regularly validated databases with professional curation and rapid updates. Tesla’s hybrid approach, while innovative in crowdsourcing, introduces inconsistencies that a purely vision-based or end-to-end AI approach may not easily reconcile in real time.
Persistent Learning
FSD seems to struggle with persistent learning from driver interventions.
Unlike consumer apps that quickly adapt to repeated corrections or user preferences (e.g., avoiding certain routes or remembering habitual detours), Tesla’s FSD often fails to internalize fixes on the same trip or across similar scenarios. Owners note making the same manual override multiple times without the routing engine updating its behavior meaningfully.
This stems from the neural architecture prioritizing real-time perception and control over long-term route memory and personalization, making navigation feel rigid and “opinionated” compared to the adaptive logic in Waze or Google Maps.
I noticed that when I asked Grok to try and get me home a certain way (a way that FSD routinely took in the past because it was the most efficient), it had to place a waypoint between my location at the time and my house. When I went to edit the waypoint out, as Grok had placed it for a way to get FSD to get off the highway at the right exit, it was stumped again, rerouted, and took a longer way home.
The next thing I’ve noticed, and this might be controversial, is that Nav has gotten even worse.
I think that might actually be a good thing; Tesla seems to be adjusting it. They just need to adjust it the opposite way.
The car is taking extremely strange routes to very… https://t.co/UHg3tVfNA2
— TESLARATI (@Teslarati) June 16, 2026
Reasoning, Scaling, and Intuition
Third, scaling navigation for unsupervised or robotaxi ambitions requires not just accuracy but adaptability and user-like reasoning. Current FSD often defaults to single routes that ignore driver preferences or real-world nuances like time-of-day traffic patterns. It fails to match the intuitive, context-aware planning that traditional systems have refined over the years.
Resolving navigation is critical for several reasons. Practically, it is the backbone of any autonomous journey: without trustworthy routing, the car cannot reliably reach destinations, rendering FSD useless for robotaxis or hands-free commutes. Safety depends on it—mismatched plans create hesitation in merges or intersections, increasing accident risk.
Economically, Tesla’s valuation and future hinge on FSD delivering unsupervised driving; persistent navigation flaws delay regulatory approval and erode consumer confidence. For owners who paid premiums for FSD, these issues represent unfulfilled promises. While it is unlikely Tesla will lose too many customers due to bad navigation, some will be frustrated with the constant need for human input.
Tesla has achieved miracles in electric vehicles and battery tech. Mastering turn-by-turn—technology Garmin nailed in the early 2000s—should not be this hard. By investing in tighter data integration, faster learning loops from interventions, and more intuitive routing algorithms, Tesla could close this gap.
Until then, FSD’s navigation struggles highlight a humbling truth: even the most ambitious innovator must sometimes master the basics before conquering the future.
A Tesla Cybertruck driver in the United Kingdom had their all-electric pickup seized by local police in the Greater Manchester area after the department cited “legitimate concerns.”
Last Thursday, police saw the pickup on the roads and decided to pull the driver over. Greater Manchester Police said:
“Whilst this may seem trivial to some, legitimate concerns exist around the safety of other road users or pedestrians if they were involved in a collision with the Cybertruck.”
🚨 A Tesla Cybertruck, which is illegal to drive in the UK due to safety concerns, has been seized by police in Greater Manchester
“Whilst this may seem trivial to some, legitimate concerns exist around the safety of other road users or pedestrians if they were involved in a… pic.twitter.com/cqhdPok3DM
— TESLARATI (@Teslarati) June 16, 2026
The Cybertruck in question was, according to the BBC, registered and insured abroad and was confiscated. The driver, who is a UK resident, was reported.
The Greater Manchester Police Department then added:
“The Tesla Cybertruck is not road-legal in the UK and does not hold a certificate of conformity.”
The Cybertruck cannot be legally driven in the UK because it has no UK Type Approval for operation in the country. This is due to some safety concerns, which are related to its angular shape and design. The stainless steel exoskeleton has sharp edges and projections that violate UK/EU rules on pedestrian protection.
Tesla has considered creating what it referred to as an “international version” that would be approved for operation in Europe. However, there has been no real movement on that front by the company, as it has been focused on the Robotaxi rollout primarily.
A new report claims that Apple is in the process of developing what would be the missing link for Tesla to get CarPlay.
Apple and Tesla have been reportedly working together for some time to give Tesla owners the opportunity to utilize CarPlay within their vehicles. While many owners are more than happy with Tesla’s in-house UI, which is seamless, effective, and smooth, some still want CarPlay, which does have its advantages.
A report from 9to5Mac now states that a new CarPlay technology that was highlighted during the Worldwide Developers Conference (WWDC) would potentially be the bridge between Tesla and Apple. With the addition of a feature known as “Route Sharing,” which gives a navigation app the ability to share routing data with the vehicle, Tesla would be able to launch CarPlay in its vehicles, the report states.
CarPlay has not been a priority for Tesla because it has done extremely well with its in-house UI, but some drivers are just used to it. Additionally, it could improve Tesla’s subpar Navigation or offer improved app capabilities, especially with iMessage.
Route Sharing is an intended addition to CarPlay’s iteration in iOS 26.4, which was released in March:
The addition of CarPlay would undoubtedly be welcome, but at the same time, it seems like Tesla realizes it is not of the utmost priority. There are so many things that Tesla is working on currently within its own vehicles, especially attempting to solve self-driving.
Back in February, Bloomberg had reported that Tesla was still working on bringing CarPlay to its vehicles, but it had not due to app compatibility issues and incredibly low adoption rates of iOS 26.
This bottleneck could buy Tesla the proper amount of time to develop CarPlay for its vehicles. It would be a welcome addition, and could be brought on with either the Summer or Fall 2026 Software Updates.
Tesla’s Navigation Nightmare: Why the easiest part of FSD might be the hardest
Tesla Cybertruck driver gets pickup seized for ‘legitimate concerns’ in UK
