FSD v14.2.2.1 (2025.45.6 Update) installed!

[dotat]

I think it might be wise to turn it off advanced before you get out of the car if you will not be charging the vehicle for a few days (like when you go on a plane trip). I have twice left the state or country only to have an update be issued and somehow everyone already knows that when an update is issued but not installed your CT can’t go to sleep and you lose 6% battery per day. I didn’t read this in any Tesla manual, but as best I can tell it is widely known and it’s one’s own fault for falling victim to this software bug. But that also means before you start your trip, you have to make sure you have the latest advanced software update so that you will be less likely to get a non-advanced update while you are gone.

Tesla is still at the teething stage of revolutionizing a 100+ year car industry…it ain’t gonna happen overnight or cheaply.

This doesn’t cause phantom drain, likely you have sentry mode on, or cabin overheat is being used a lot. I drop about 5-6% with sentry mode is on at the airport in nice weather.

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[pae1andonly]

Again observing 50% downloaded ... then 4, 6, 9, 13.
Different chunks, modules? Car software, FSD, nav?

Edit (Grok):
The Tesla software update process, which includes Full Self-Driving (FSD) downloads, consists of two primary phases: downloading the update over Wi-Fi and then installing it while the vehicle is parked.

tesla.com
However, the download phase isn't always linear due to behind-the-scenes steps, which can make the progress bar appear erratic, paused, or even jumping backward in percentages (like the 50% to 4% to 32% to 10% behavior you described).Here's a breakdown of the typical steps involved, based on how Tesla's over-the-air updates work:

1. Initiation and Initial Download: The update is queued and begins downloading the software package files over a stable Wi-Fi connection (Tesla recommends at least three bars). A green download icon appears on the touchscreen or app. This is where you might see steady progress up to around 50%, as the main bulk of data is fetched.
   
   tesla.com
   The vehicle can be driven during this, but leaving Wi-Fi range may pause it.
2. Verification and Checksums: Once the initial download hits a checkpoint (often around 50%), the system pauses to verify file integrity through checksum checks to ensure nothing is corrupted. This can cause the progress bar to stall, show 0B/s download speed, or seemingly reset/drop (e.g., from 50% to a lower number like 4%) as it processes in the background.
   
   reddit.com
   These pauses can happen at other intervals too, like every 25%, but 50% is commonly the longest.
3. Unpacking/Decompression: After verification, the files are unpacked or decompressed. This sub-phase can make the bar jump around again (e.g., climbing to 32%, then dropping to 10%) because the UI doesn't clearly separate these steps—it's all lumped under "download" progress, leading to misleading visuals.
   
   reddit.com
   The car might disconnect from Wi-Fi temporarily here for internal tasks.
4. Final Preparation and Transition to Install: Once unpacked, the update is fully prepared, and the progress completes. You'll get a notification to install (which requires the car to be parked and can take hours). The longest pauses often occur near 100% during final checks.
   
   reddit.com

This erratic progress is a common complaint due to the UI not explicitly showing these sub-stages—it's normal and not a failure, as long as you leave the car connected and undisturbed (ideally overnight).

reddit.com
If it truly gets stuck for hours without resuming, try a soft reboot by holding both steering wheel scroll buttons for 20 seconds, or contact Tesla support for a remote reset.

tesla.com

PS Also discovered this update blew through my Starlink mini data plan. So it paused until I drove close enough to my SIL's garage to get her wifi and finish the download.

 

[dotat]

Again observing 50% downloaded ... then 4, 6, 9, 13.
Different chunks, modules? Car software, FSD, nav?

I didn’t watch mine, but it downloaded and installed last night when I kicked it off. App notification wise shows it took a bit longer than others have (1.5 hours vs 35 mins)

 

[Leifmb]

This doesn’t cause phantom drain, likely you have sentry mode on, or cabin overheat is being used a lot. I drop about 5-6% with sentry mode is on at the airport in nice weather.

Yep!

 

[BrockN]

My Cybertruck’s FSD pulled over for an ambulance last week, even before this update

At first I thought it was trying to drive along the shoulder as if it were a lane (one of FSD’s greatest hits). Then I heard the siren and saw an ambulance screaming up behind me from a distance. I was impressed that the Cybertruck detected it from that far away.

Actually I already experienced most of these and FSD did very well. I was driving along a ranch’s dirt road and the Cybertruck stopped at a gate and then drove through once it opened. It lapped a parking garage to descend three levels and then exited (I didn’t think it could do that). It maneuvered around a stalled pickup truck blocking two lanes on a busy feeder road. Also it avoided road debris without violent last minute swerves, even in Mad Max mode.

Mine pulled over and stopped for a firetruck, approaching from behind...in heavy traffic, the dark and torrential rain.

It also saw a large cube van back out of a driveway on the other side of a signalized intersection. My truck stopped before entering the the intersection, even though the cars ahead were still moving, but slowing down for the van. So it recognised that the cars were going to be stopped and that we'd be blocking the intersection if we followed. I thought that was interesting.

 

[jahansolu]

Again observing 50% downloaded ... then 4, 6, 9, 13.
Different chunks, modules? Car software, FSD, nav?

Edit (Grok):
The Tesla software update process, which includes Full Self-Driving (FSD) downloads, consists of two primary phases: downloading the update over Wi-Fi and then installing it while the vehicle is parked.

tesla.com
However, the download phase isn't always linear due to behind-the-scenes steps, which can make the progress bar appear erratic, paused, or even jumping backward in percentages (like the 50% to 4% to 32% to 10% behavior you described).Here's a breakdown of the typical steps involved, based on how Tesla's over-the-air updates work:

1. Initiation and Initial Download: The update is queued and begins downloading the software package files over a stable Wi-Fi connection (Tesla recommends at least three bars). A green download icon appears on the touchscreen or app. This is where you might see steady progress up to around 50%, as the main bulk of data is fetched.
   
   tesla.com
   The vehicle can be driven during this, but leaving Wi-Fi range may pause it.
2. Verification and Checksums: Once the initial download hits a checkpoint (often around 50%), the system pauses to verify file integrity through checksum checks to ensure nothing is corrupted. This can cause the progress bar to stall, show 0B/s download speed, or seemingly reset/drop (e.g., from 50% to a lower number like 4%) as it processes in the background.
   
   reddit.com
   These pauses can happen at other intervals too, like every 25%, but 50% is commonly the longest.
3. Unpacking/Decompression: After verification, the files are unpacked or decompressed. This sub-phase can make the bar jump around again (e.g., climbing to 32%, then dropping to 10%) because the UI doesn't clearly separate these steps—it's all lumped under "download" progress, leading to misleading visuals.
   
   reddit.com
   The car might disconnect from Wi-Fi temporarily here for internal tasks.
4. Final Preparation and Transition to Install: Once unpacked, the update is fully prepared, and the progress completes. You'll get a notification to install (which requires the car to be parked and can take hours). The longest pauses often occur near 100% during final checks.
   
   reddit.com

This erratic progress is a common complaint due to the UI not explicitly showing these sub-stages—it's normal and not a failure, as long as you leave the car connected and undisturbed (ideally overnight).

reddit.com
If it truly gets stuck for hours without resuming, try a soft reboot by holding both steering wheel scroll buttons for 20 seconds, or contact Tesla support for a remote reset.

tesla.com

I've definitely noticed this behavior. I figured it's because of all the different packets and packages it has to install. Thank you for your deep analysis on this matter. I do wish that once the download was done, it wouldn't be so persistent on having a Wi-Fi / Internet connection. Many times I know the download process is done, yet it will refuse to continue to unpack if there's no internet.

IMO, the update situation really needs a revamping. This process was acceptable from 2012-2020. However, ever since they released and utilize the Ryzen chipset, Tesla should upgrade the update process - I'm thinking more like iOS/iPad OS update style. Download first, then install (without persistent internet connection). Furthermore, it would be awesome if they follow what Apple has done when it comes to Public Beta / Developer Beta builds. Hopefully in future vehicles, Tesla will move away from eMMC type storage and utilize nvme - this should significantly boost update speeds, time to install, and reliability.

If there are any Tesla employees reading this: Redesign the update page.
Here's how:
1) Keep the update sliders, but change it: "Standard", "Early Access", "Beta"
2) Every time the user moves the slider between these options, it actually checks for updates - not some placebo effect.
3) Provide an estimate time to finish download and unpack.

 

[bg002h]

This doesn’t cause phantom drain, likely you have sentry mode on, or cabin overheat is being used a lot. I drop about 5-6% with sentry mode is on at the airport in nice weather.

None of that is true, but I appreciate the user debugging. And it is in low power mode, which is even sadder.

Anyhow, the drain is a well known long standing bug and it has something to with updates being issued while you’re out of town. But I did learn if you sign out of the Tesla app entirely, the rate of battery drain drops from 6% to 1% per day, which is an awesome and most welcome improvement when you’re parked at an airport with only 54% battery remaining (initially…it wasn’t until I got to the 31% mark that I thought to try signing out) and after 1.5 days I’ve only lost 2%!

 

[bg002h]

I ALWAYS leave the software setting on ADVANCED. I don’t have any phantom drain, never use low power mode and sometimes get updates very early, other times not so early! I will take every FSD/Software update I can get, as early as I can get!

As an interesting test, consider not acknowledging the update and not charging for a week and see how much battery gets used during that time and compare it to normal drain rate…

 

[axhoaxho]

2025.45.6 installing now. Merry Christmas!


(* Interesting: When the software was being installed, I looked at my phone app and saw the truck's frunk was opened and then closed. It happened a couple times. I have never seen that before.)

 

[CT425]

Got my Christmas present,
FSD v14.2.2.1
installed. Merry Christmas!

 

[dotat]

None of that is true, but I appreciate the user debugging. And it is in low power mode, which is even sadder.

Anyhow, the drain is a well known long standing bug and it has something to with updates being issued while you’re out of town. But I did learn if you sign out of the Tesla app entirely, the rate of battery drain drops from 6% to 1% per day, which is an awesome and most welcome improvement when you’re parked at an airport with only 54% battery remaining (initially…it wasn’t until I got to the 31% mark that I thought to try signing out) and after 1.5 days I’ve only lost 2%!

Well at least not my experience. I had the one version come out around Dec 15th when I had my CT at the airport. I parked at about 85% and about 2 3/4 days later I had 72% even though it was pending that update most of the time. The update was pulled, not sure why, but several folks reported various problems. I had sentry mode on the whole time, but cabin overheat likely didn’t kick in as it was 55-75 out in AZ and I was in a covered garage.

 

[CyberWalrus]

Just updated and short drive show more confident in the lane changes. That was the biggest downgrade from 14.1.7 to 14.2. Very slow and frustrating lane changes. Too much blinkers. The lane changing on 14.1.7 was perfect for my style of driving. Although, it did change lanes too much, but was always quick and confident.

One thing also downgrade is the speed modes. 14.1.7, the modes personalities fit more what it was named. 14.2, all the modes seem sloth but with just faster limits. Not just about the slower speed limits, but the overall swiftness. Example, merging into a faster lane or on ramp with cars coming up is sluggish, I have to nudge it to get going.

 

[pae1andonly]

Yes, the lane change ennui is fixed, though I did encounter some indecision in getting back out of a Sheetz charging location. To be fair, it was an odd layout. The best exit was not clear to me either.

 

[Galvatron]

14.2.1 was better for me.

This one is slow and the profiles are not responsive to adjust speed. E.g. going under the limit in Standard > scroll to hurry or mad max > still slow > then it speeds up too fast > scroll back down to standard > goes back too slow again

Significant brake tap at right turn at an intersection with blinking right arrow. I hit the accelerator to push through the hesitation.

Will scroll wheel reset and see it there is any improvement

 

[nevetsyad]

So, 14.2.2.1 broke my hands free FSD basically. Start of every drive it says it’s disabled and starts telling me to put force on the wheel.

Pick up a device and you get a near instant FSD strike out.

Also, it keeps doing 3 under the speed limit in hurry mode. May need to run mad max to keep up with traffic? Afraid it’ll do 60 in my 35 zone though.

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