Why would I want to hack the bootloader for a wall charger? Asking for a friend
culi•May 14, 2026
You can bypass vehicle restrictions. You could potentially then use it for J1772-compatible EVs (like a Chevy Bolt or Nissan Leaf)
Or just for the spirit of actually owning the shit you pay for.
m463•May 14, 2026
I don't think there are any restrictions. I think j1772 might just work with an adapter (adapt from the nacs plug to the j1772 plug)
I thought tesla even made a j1772 native wall connector.
akerl_•May 14, 2026
Can confirm. I've used an adapter to charge 2 different non-Tesla cars off my wall connector.
adamsb6•May 14, 2026
I use my Gen 1 Tesla Wall Connectors to charge my NACS-native Lucid Gravity.
mprime1•May 15, 2026
There are some restrictions.
I had the foolish idea of installing a Tesla charger at home to charge my Bolt. I’ve been unable to ever use it.
The wall charger works fine with Teslas.
My car and adapter charge fine at Tesla superchargers.
But the home Tesla charger refuses to charge my Bolt.
(Yes I disabled vehicle restrictions and tried all sorts of combinations of settings for weeks before giving up. Tesla support was useless of course)
Restriction or bug, same difference.
cogman10•May 15, 2026
Really gross. I have a gen 1 charger and it's dumb as bricks. Basically just a giant relay.
I guess I could see why you might want to restrict who can use your charger, but I really prefer the "dumb as bricks" version I currently have.
decimalenough•May 15, 2026
What vehicle restrictions? This is for the Tesla home charger, not Superchargers.
brianwawok•May 15, 2026
Exactly. Charge both my Tesla and my leaf with mine.
culi•May 15, 2026
Older models are locked to Tesla vehicles. Tesla has regional restrictions in many parts of the world.
You also never know when there could be another update and your region becomes one of those that has these restrictions.
Rebelgecko•May 15, 2026
Some don't support j1772 adapters with non Tesla vehicles
NewJazz•May 14, 2026
Implement your own payment provider
fc417fc802•May 15, 2026
To play doom on it?
kotaKat•May 15, 2026
Publicly accessible piece of equipment that could have a pseudo-trusted connection to an internal network (since they're connected to the Tesla Cloud(tm)).
Picturing someone rolling up to a charger outside of a large office building, 'plugging in', exploiting the charger via the communications, then using the charger to pivot inwards.
m463•May 14, 2026
I hate the gen 3 wall connector.
It creates a wifi access point in your garage that you cannot turn off:
TeslaWallConnector_<unique-id>
some people were able to downgrade their firmware to a version that didn't do that, but i guess this article shows telsa got rid of that ability.
I would love to be able to hack any firmware to disable that.
I also read that a connected tesla car can force an over-the-air firmware update maybe through the charging cable or wifi, but I haven't verified that.
iugtmkbdfil834•May 15, 2026
Thank you. This information is not listed anywhere and I am currently getting quotes for solar panel build.
ralph84•May 15, 2026
The SSID stops broadcasting after the unit is commissioned, unless you're using power sharing between multiple units. In that case the SSID is used for the units to communicate.
m463•May 15, 2026
by commissioned you mean "connect it to your home wifi and let it talk to tesla"? (i won't do that)
because it hasn't gone away after configuring the setup stuff (amps, etc)
Rohansi•May 15, 2026
Mine did
ralph84•May 15, 2026
And make sure the firmware is up to date. Mine is at 26.2.2.
mystraline•May 14, 2026
Repeat after me:
An owner voluntarily downgrading firmware to gain control of your hardware IS NOT A HACK.
And if an adversary is doing this, then they have already breached yoir physical security.
kube-system•May 15, 2026
Eh, that’s a bad generalization. defense in depth is a thing and there are many cases where you’d want to protect against attackers with physical access
AlotOfReading•May 15, 2026
Any system where your defense in depth involves UDS is pretty much guaranteed to be broken though.
zelon88•May 15, 2026
This isn't designed to stop attackers with physical access. This is designed to stop casual tinkerers and shade tree mechanics.
You know what isn't vulnerable? A "dumb" offline charger. You know what doesn't make any money or turn the consumer into another product? A "dumb" offline charger.
If it were about physical security, the suggested fix would be to remove the communication from the port entirely.
Companies shouldn't get to make something simple and secure into something inherently insecure and then iterate security into it. Like drive by wire steering, or brakes. Nobody asked for these things and if you ask ANYONE who works on, builds, or actually enjoys cars the consensus is NOBODY wants it.
But there are enough sophomoric, pedestrian car owners out there who gawk at the senseless overdeployment of technology and think "this is so convinient" and don't see it as 1) regulatory barrier building and gatekeeping 2) enabling vendor lock in 3) overcoming right to repair legislation. So the knowledgeable and enthusiastic voices of reason who care about cars get drowned out by the hoard of pedestrian geeks who couldn't imagine operating a car without at least a 16 inch touchscreen.
In security, the best defense is not introducing a vulnerability at all. There is value in having less code. For example, if your PaaS doesn't collect user SSNs... then it can't lose SSNs in a breach.
The question here should not be "why is this not secure." The question should be "why does this even need to be secure in the first place?" We have a very simple task to do and we've complicated it so much we've introduced vulnerability that didn't exist previously.
taneq•May 15, 2026
Arguably it’s a crack. A good one, though.
pram•May 15, 2026
They shouldn’t be able to do it through the charging cable though lol
abofh•May 15, 2026
It's a car the charging port is a viable physical perimeter, letting people inject code at the pump is a risk of design, not user error.
aussieguy1234•May 15, 2026
I mean its still technically hacking, but not all hacking is bad/illegal.
zelon88•May 15, 2026
I thought the same thing. How white hat do you have to be to consider ineffective DRM a vulnerability?
wolrah•May 15, 2026
This exploit is delivered through the charging cable to the wall box. These wall boxes are sometimes intentionally located in public spaces with the intent of allowing public charging, and Tesla has features specifically for that use case, so that cable is absolutely expected to be plugged in to untrusted vehicles.
_flux•May 15, 2026
It clearly seems people have different meanings to the word, then.
For example, if I am able to gain root access to a WiFi access point I own, even though the vendor has tried to prevent it, then yes, I would call it a hack. To me, it doesn't matter why or who is doing the steps.
In fact, I believe I have never before heard someone combine the meaning of the word to be related to the ownership of the device being hacked.
I suspect the number of people understanding the word in your way is a minority. Redefining terms doesn't help build mutual understanding: here we are taking a word some think has negative connotations and then remove the thing they think should be cool and ok, and then suggest that this is actually the real meaning of the word. Personally I don't think this is how words should be wielded.
oneshtein•May 15, 2026
> For example, if I am able to gain root access to a WiFi access point I own, even though the vendor has tried to prevent it, then yes, I would call it a hack.
Yep. The owner of the device can sue you.
thejazzman•May 15, 2026
PSA: If your wall connector loses wifi, it'll just throw your charging schedules out the window and turn on/off sporadically. This is especially noteworthy if you have Time of Use billing :| SET THE TIMER ON THE CAR DIRECTLY!
compounding_it•May 15, 2026
>SET THE TIMER ON THE CAR DIRECTLY!
This would open up a lot of issues to get away with not paying and charging for free.
m463•May 15, 2026
Your comment makes no sense. The tesla wall connector is a home charging port you install in your garage.
compounding_it•May 15, 2026
I knew this is about wall charger at home but I assumed ‘time of use billing’ was some kind of billing system for the charger that’s implemented.
lexicality•May 15, 2026
some people have variable electrical tariffs, so electrical use in the middle of the night is usually much much cheaper than the middle of the day.
pjc50•May 15, 2026
That's done on the property's electricity smart meter.
rblatz•May 15, 2026
I spent an hour yesterday getting the wall connector back on my wifi. Apparently last October when I added wifi 7 access points my network started working in WPA2/WPA3 mode and the wall connector wasn’t compatible with that. Ended up having to create a second SSID with WPA2 only support to get it back online.
Supposedly the newest update fixes that, but I haven’t taken the time to test that out.
But WiFi is shocking my fragile on these wall connectors, I’ve had a lot of trouble keeping it connected to my home network over the years.
a10c•May 15, 2026
or, use Home Assistant to handle your charging schedules.
eleveriven•May 15, 2026
It also fits the broader theme here: too much important behavior seems to live in the "application layer" of the charger, while the more durable source of truth is elsewhere.
cryptoegorophy•May 15, 2026
Why use Tesla wall connector in a first place and not just the standard nema/dryer outlet with the Tesla cord/charger? It seems like people are overpaying for nothing.
tenuousemphasis•May 15, 2026
I can do 48A @ 240V with my wall connector. It's also very convenient.
spacebanana7•May 15, 2026
One thing I'm really scared of is EV charger software being modified by users, hackers or bugs to pull max power at times that don't suit the grid.
In the UK, for example 10 million EVs all pulling 7kw would overwhelm the roughly 70GW potential of the grid. Even a million EVs charging at an inconvenient time could add a 7GW draw which is enough cause a problem.
formerly_proven•May 15, 2026
Which we know is very likely because EVs are both slow and get poor mileage, so most of them need to be charged daily or for a longer commute even twice per day. That's also why their batteries fail so quickly, imagine charging your phone two times a day, it won't last a year.
6 Comments
Or just for the spirit of actually owning the shit you pay for.
I thought tesla even made a j1772 native wall connector.
I had the foolish idea of installing a Tesla charger at home to charge my Bolt. I’ve been unable to ever use it.
The wall charger works fine with Teslas. My car and adapter charge fine at Tesla superchargers.
But the home Tesla charger refuses to charge my Bolt. (Yes I disabled vehicle restrictions and tried all sorts of combinations of settings for weeks before giving up. Tesla support was useless of course)
Restriction or bug, same difference.
I guess I could see why you might want to restrict who can use your charger, but I really prefer the "dumb as bricks" version I currently have.
You also never know when there could be another update and your region becomes one of those that has these restrictions.
Picturing someone rolling up to a charger outside of a large office building, 'plugging in', exploiting the charger via the communications, then using the charger to pivot inwards.
It creates a wifi access point in your garage that you cannot turn off:
some people were able to downgrade their firmware to a version that didn't do that, but i guess this article shows telsa got rid of that ability.I would love to be able to hack any firmware to disable that.
I also read that a connected tesla car can force an over-the-air firmware update maybe through the charging cable or wifi, but I haven't verified that.
because it hasn't gone away after configuring the setup stuff (amps, etc)
An owner voluntarily downgrading firmware to gain control of your hardware IS NOT A HACK.
And if an adversary is doing this, then they have already breached yoir physical security.
You know what isn't vulnerable? A "dumb" offline charger. You know what doesn't make any money or turn the consumer into another product? A "dumb" offline charger.
If it were about physical security, the suggested fix would be to remove the communication from the port entirely.
Companies shouldn't get to make something simple and secure into something inherently insecure and then iterate security into it. Like drive by wire steering, or brakes. Nobody asked for these things and if you ask ANYONE who works on, builds, or actually enjoys cars the consensus is NOBODY wants it.
But there are enough sophomoric, pedestrian car owners out there who gawk at the senseless overdeployment of technology and think "this is so convinient" and don't see it as 1) regulatory barrier building and gatekeeping 2) enabling vendor lock in 3) overcoming right to repair legislation. So the knowledgeable and enthusiastic voices of reason who care about cars get drowned out by the hoard of pedestrian geeks who couldn't imagine operating a car without at least a 16 inch touchscreen.
In security, the best defense is not introducing a vulnerability at all. There is value in having less code. For example, if your PaaS doesn't collect user SSNs... then it can't lose SSNs in a breach.
The question here should not be "why is this not secure." The question should be "why does this even need to be secure in the first place?" We have a very simple task to do and we've complicated it so much we've introduced vulnerability that didn't exist previously.
For example, if I am able to gain root access to a WiFi access point I own, even though the vendor has tried to prevent it, then yes, I would call it a hack. To me, it doesn't matter why or who is doing the steps.
In fact, I believe I have never before heard someone combine the meaning of the word to be related to the ownership of the device being hacked.
I suspect the number of people understanding the word in your way is a minority. Redefining terms doesn't help build mutual understanding: here we are taking a word some think has negative connotations and then remove the thing they think should be cool and ok, and then suggest that this is actually the real meaning of the word. Personally I don't think this is how words should be wielded.
Yep. The owner of the device can sue you.
This would open up a lot of issues to get away with not paying and charging for free.
Supposedly the newest update fixes that, but I haven’t taken the time to test that out.
But WiFi is shocking my fragile on these wall connectors, I’ve had a lot of trouble keeping it connected to my home network over the years.
In the UK, for example 10 million EVs all pulling 7kw would overwhelm the roughly 70GW potential of the grid. Even a million EVs charging at an inconvenient time could add a 7GW draw which is enough cause a problem.
https://i.redd.it/dtm6zs3wkyjc1.png