Totally Bricked CT at supercharger

[LuvOrH8]

I don't think there is a 12v battery in the CT. I think it's a 48v battery. And I'm pretty sure it's a lithium battery.

Yes there is. It powers 12v accessories.

Sponsored

 

[Vladimer]

Thanks so much for posting this. I learned a lot on this thread, the linked one and the videos. Sounds like I need to get a 12V lithium jumper tool. Couple Noobish questions:

1. Any recommendations on the jumper or important considerations?
2. If you have to jump the main 12V battery inside the frunk behind the panel insert, can that be done with a regular gas car battery / cables as well? Or would that overpower / damage the lithium battery?
3. For opening the Frunk using the little pull down cables beside the wheel well on the driver side, could that be done with a regular car's battery or does it require a low voltage solution that the lithium jumper is specific to?

 

[LuvOrH8]

The other question being discussed on the backup 12v jumper, where is the best place to store it so easy access when locked out of vehicle?

 

[mcm4ss]

Actually the critical alert I got on my phone was that dog mode was inoperative and “environmental system fault”. So that’s kinda reassuring.

yes, but... question. were you able to just go get dogs out, or did you have to jump it first? That is the dilemma. Phone worked great, yes but if dogs were then trapped in that oven in 100 I would have no time to figure it out and would have to try to break something fast. Tough truck to do that too. This is the ONLY area where I think a mechanical lock opener sort of thing would be beneficial.

 

[Ivessm]

Yes there is. It powers 12v accessories.

I still don't think there is a 12v battery in the CT.

From Google:

No, the Tesla Cybertruck does not use a 12V low-voltage battery for its main systems. It is the first production vehicle from Tesla to feature a full 48V low-voltage architecture. This 48V lithium-ion battery powers systems like the windows, doors, and steering.

Key details regarding the Cybertruck's electrical system:

48V System: The truck uses a 48V battery, which allows for thinner wiring and higher efficiency.

12V Compatibility: While the main system is 48V, the user manual indicates it can still be jump-started using a 12V source in emergency situations.

Accessories: Standard 12V accessories cannot be plugged directly into the system, often requiring 48V-to-12V converters for aftermarket electronics.

From TESLA:

Low Voltage Battery
The front of the vehicle with the hood open and an `arrow pointing to the low voltage battery
Cybertruck uses a 48V lithium-ion low voltage battery. The 48V battery powers the windows, doors, touchscreen, and other low voltage vehicle systems when the high voltage Battery is unavailable. The 48V battery also provides a redundant source of power for critical systems (such as power steering).

Note
48V low voltage connectors are colored blue for easy identification, and wires that operate at 48V are marked with blue tape.
By using a 48V low voltage battery instead of the 12V lead-acid battery found in many conventional vehicles, Cybertruck is able to operate more efficiently.

 

[LuvOrH8]

hmm maybe it is a 48v battery, just figured it was a 12v given you use a 12v jumper to energize it to open given doors and hatches. Must be a bypass cables that go straight to those items bypassing a step down converter.

 

[Obsoletion]

The there is a 48v battery instead of a 12v battery. The made it so a 12v battery will open the frunk and jump the system to get it going so that you would be able to jump it with other 12v vehicles or a 12v jump pack.

 

[eSteve]

With our 2020 Model Y, the trick was to stow a small 12v battery with the wheel well jumper wires.

You’d use the small 12v battery to unlatch the frunk, then use a proper booster pack (hopefully stowed in the frunk, haha!!) to jump the car.

https://www.amazon.com/dp/B07GNMFLKH?th=1

I never knew you could buy such small 12V batteries. Then again, I'm not a battery researchologist, so theres that...

 

[Ivessm]

hmm maybe it is a 48v battery, just figured it was a 12v given you use a 12v jumper to energize it to open given doors and hatches. Must be a bypass cables that go straight to those items bypassing a step down converter.

Hmmm!! No MAYBE about it. It _IS_ a 48v lithium battery that provides the low voltage power on the Cybertruck. There is NO 12v battery on a Cybertruck.

 

[LuvOrH8]

Hmmm!! No MAYBE about it. It _IS_ a 48v lithium battery that provides the low voltage power on the Cybertruck. There is NO 12v battery on a Cybertruck.

hmm maybe

 

[espresso-drumbeat]

hmm maybe

I think you should notify Tesla so they update the manual to properly indicate 12v battery...

Link to the manual: Electric Vehicle Components

 

[LuvOrH8]

LOL will call them tomorrow.

 

[Semoreo]

From personal experience. You can jump out using either a 48v or 12v power source. Whether it's a battery or power supply like I had. The 12v converter is for convenience since that's what everyone has to jump with.

 

[CyberGus]

From the Owner's Manual:

• If you are using a variable power supply, set the supplied voltage to a value between 12V and 16.5V or between 30V and 50V.
• CAUTION
  If you are using a variable power supply, do not change the supplied voltage while the cables are connected. Doing so may cause damage to the vehicle.
  
  

 

[LarryASilva]

I’ve had 5 different Teslas, 250,000 miles and never had any significant issue until today. And it was awful.
On a 350 mile trip back to home. Half way I plugged in to supercharger at 18% charge, went in to pick up some snacks, left the dog with dog mode on. About 20 minutes later at 50% got a “critical“ alert notification to “return to truck immediately“, “environmental system error and dog mode inoperative”. Went back to the truck, looked ok except the same alert at the bottom of the screen and it had stopped charging. Decided to try a different charger but…
-The charge cable would not release. Figured out how to pull the emergency release cable in the tailgate and got the charge cable out.
-Charger port door wouldn’t close. Screen was still working but the “button” did nothing. Same with the control on the app.
-Pushed in the brake to see if that would turn on the car and everything went black. No power to anything.
-Couldn’t open the door to get out. Had to use the emergency lever. Important to note that someone has to be in the truck to open the door when it’s dead. No way to open from the outside if it closes. Also the window doesn’t open slightly as usual so when you do shut it you could easily brake the glass on the outside of the frame.
-While waiting on hold with Tesla roadside it was getting dark and very cold (22F) so wanted to get some layers out of luggage in the back but without power tail gate nor tonneau cover can’t be opened. Same with frunk.
-Had to crawl from the front to the back seat and figure out a completely different emergency release for the back door so I could get the golden retriever out for a walk on the now frozen ice rink of a parking lot.
-Tesla service had me try a “2 minute“ reboot. Didn‘t work. They sent a tow truck. After two very cold hours he arrives.
-Used his jumper box to open the frunk and then attached it to the low voltage terminals behind the plastic at the top of the frunk. (Youtube and an iPhone is a lifesaver).
-Truck woke up, opened the tailgate, etc and the screen came on so I could put it in tow mode. But…
-Started winching it up on the flatbed but was angled wrong. Tried to turn the wheel slightly and I felt a pop in the steering and everything went dead again, including the steering. Also the wheels all locked up so must have cancelled out the tow mode.
-Disconnected and reconnected booster to low voltage terminals and tried again. Everything woke up again, but immediately died when I tried to do anything with the wheel. Repeated a couple of times but his booster box was too low on charge and the doors would no longer open. (I’m wondering if the booster had a better charge if the steering would have stayed alive longer?)
-Had to use “go jacks”(?), little sleds under each locked wheel, and finally, after snapping one tow rope, he was able to drag it, locked wheels and all, up on the flatbed. (Why he was using a rope along with the tow straps I have no idea.)
-It’s now on the way to a service center a couple of hours away. It’s well past closing so we will find out tomorrow (hopefully) what the problem is. -In the meantime we found a pet friendly Uber and a nearby pet friendly hotel and are checked in and warming up. Very rough day. But learned a lot. To be continued.

Thanks very much for sharing your experience ... and providing us with the well written details.

Sponsored