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12v System Failure While Driving
- Thread starter RowdyMY
- Start date
Yes, I believe power conversion system is the name Tesla uses for the DC-to-DC converter that provides power for the 12V systems, accessories whenever the Tesla vehicle is powered on.
TomServo
Active Member
This is BAD news GOOD news story given the quickness of the failure and circumstances the owner had to deal with. When we travel we carry a small A23 12V battery with us (my wife carries it in her purse) should we need to get to the jump start wires located behind the tow hook cap to at least unlock the car. Still looking for a temp place to stow it on the exterior, but it's small enough to carry in a pocket. This is the USAF in me.
Rice&Curry
Member
I had the same thing happen to my MYLR 6 days after taking delivery. Our car broke down 100 miles from home. When we went to get back into it, the car wouldn't start. Same warnings as you. They towed the car to a dealer that was only a couple of miles away. After that everything was a pure nightmare. Even though roadside assistance said the dealer would work on the car, when we got there they were reluctant to do so. They wanted to give us Uber credits to get home. Ultimately, they did try to swap out the 12v but it didn't work and they gave us a loaner. It took a week to replace the Power Conversion System. It was very difficult to get information from the repair shop or to get any support from Tesla. My feeling at the end is that Elon Musk has imprinted his personality disorder on the entire company. Tesla did exactly nothing to make the situation easier/better. All of that being said, we love our new Model Y. The only comfort was that in searching for Power Conversion System failures, I could not find much discussion. I'm glad that not many people are having to deal with this.
It's not listed in the owner's manual that I could find. If someone has a more thorough understanding please feel free to correct.
The PCS is an LRU that sits on the main battery. Primary functions are to convert AC to DC for charging and 400v>12v for the 12v bus. It's modular in that there are a couple of subsystems that make up the PCS but the entire system is contained inside one singular LRU.
@Rice&Curry
boingolover
Late 2021 Blue on White MYLR 5 w/ tow
This might be detailed in the Tesla parts catalog: Parts Catalog
You should be able to log in, search the catalog using your Tesla account credentials.
boingolover
Late 2021 Blue on White MYLR 5 w/ tow
I'm guessing it's PN 1135558-04-A
description is: ASY,Power Conversion System,PCS,48A-CD,1PH
Rice&Curry
Member
The worrying thing is why is a new vehicle facing such problems- is the internal QC of the LRU's and other subsystems so poor that they are entering the production line? Much as I love Tesla cars, I am really getting concerned that they may be cutting corners as they scale up production to keep Wall Street happy.
boingolover
Late 2021 Blue on White MYLR 5 w/ tow
I agree with you to a point, but every vehicle will have some failures. And a lot of times with electronics, it will fail early if it's going to fail. I think the main thing to pay attention to is what the manufacturer does when it fails.
AlexHung
Member
With any new vehicle it would be good practice to wait a month, maybe two before taking a long trip in your new vehicle. Over that time any faulty component may show itself and fail completely.
Rice&Curry
Member
You're trying to say that would affect the 12V battery system? No, it wouldn't. A/C and heating always run from the main battery. The 12V system is not relevant to that.
My MYLR was 6 days old when the PCS failed. I don't think the breakdown had anything to do with the 12v system.
I have MY end of Q3 2021 release. The car died 2 times when not connected to charger for more than 3 days. When screen is dead, the car can still open. Connecting to charger wakes it up. Is it 12v battery or PCS
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