TESLA MODEL S stopped working... CAR MAY NOT RESTART

[Qurix]

HI

I had a problem with 12v battery... Car was working normal until i saw "car may not restart" "contact with tesla service that will not help you" and 12v low.... Everything was working. car was running and restarting and soon it stops... I can tell you that when it was driving the error code was shown but if i put to neutral it disappeared and after put in to drive it shows agin randomly after 30 seconds or 1 minute. Well i drive back home charge my car to full and at the next day it wount restart... I change 12 v battery connected to external source but only one thing i hear is that car is clicking contactors and wount let the HV work... Any idea where to start?

 

[BerTX]

I assume there is some reason you are not contacting Tesla service?

 

[Qurix]

I assume there is some reason you are not contacting Tesla service?

Yes there is no tesla service in my country

 

[ordel]

When I had a similar message it turned out that I needed a new HV battery (not a 12v battery - the actual high voltage battery). You may be in for trouble if you can’t get to a service center.

 

[Qurix]

Dont worry we realy can do more that service center... I just want to know where to start... My friend is on the way with diagnostic software and in few hours we will know what is going on... However if some one had problem like this please share...

 

[neovic]

I don't want to worry you but mine had the same problem and it spent almost a month at the Service. Rear motor and contactors had to be replaced. I hope it's not your case.

 

[Upscaleman]

Yes there is no tesla service in my country

I'd be hesitant about buying a car with no service in my country.

I'd hate to have to drive to Mexico or Canada for service.

 

[Qurix]

Solved... As i said Car is up and running.

 

[nemSoma]

Solved... As i said Car is up and running.

What alert did you have? I mean the code, not the customer text

 

[Qurix]

Photo attached.

 

[nemSoma]

Ah so you had an external iso fault. You tracked down the faulty part? DU, battery heater, DCDC, compressor, which one was it?

 

[Qurix]

Honestly 12v battery problem... It really needs to be charger at 13,5v and problems gone

 

[nemSoma]

Honestly 12v battery problem... It really needs to be charger at 13,5v and problems gone

You had a HV leak. That is what is called an external isolation fault.
The BMS measures the resistance between the HV leads going out and ground and if the resistance drops below a certain value it will cause a fault.
The alert very clearly shows it. You either have a faulty DU, HV battery heater, A/C compressor or DC/DC converter.
Whatever you did to the 12V battery probably didn't fix it, more likely just a coincidence.

You don't have to believe me, but when the car stops again... I told you!

 

[Qurix]

Ok so what you suggest to do ?

 

[Qurix]

Something is not correct im sure... And its little odd that when 12.5 v is supply contactors doesn't want to close...

 

[chrgra]

A lot of model 3 owners could not start their Car Any more as of low 12v battery.Cause was a bad connector Charging the batterie en correcting the bad connector was mostly the solution.

 

[hacer]

You had a HV leak. That is what is called an external isolation fault.
The BMS measures the resistance between the HV leads going out and ground and if the resistance drops below a certain value it will cause a fault.
The alert very clearly shows it. You either have a faulty DU, HV battery heater, A/C compressor or DC/DC converter.
Whatever you did to the 12V battery probably didn't fix it, more likely just a coincidence.

You don't have to believe me, but when the car stops again... I told you!

An isolation leak can also be caused by moisture getting where it shouldn't be able to go. If the car had been in wet conditions and is now dry that could have cleared the fault too.

 

[Qurix]

A lot of model 3 owners could not start their Car Any more as of low 12v battery.Cause was a bad connector Charging the batterie en correcting the bad connector was mostly the solution.

Bad connector on the battery 12 v ? Or bad connector somewhere else?

 

[nemSoma]

You either have a damaged module that needs to be replaced, or the fault was temporary, caused by moisture as @hacer said

If the alert comes back up again, measure resistances between the HV leads and ground at the HVJB.
I think the alert triggers below around 1.5 MOhms
If any of the wires show a low resistance then it is causing the fault.

 

[Qurix]

You either have a damaged module that needs to be replaced, or the fault was temporary, caused by moisture as @hacer said

If the alert comes back up again, measure resistances between the HV leads and ground at the HVJB.
I think the alert triggers below around 1.5 MOhms
If any of the wires show a low resistance then it is causing the fault.

You ment measuring high voltage system ? On junktion box right? And if that will be not correct what to change? Cables?
Funny thing is that car doesnt show whats wrong... How you predict DCDC or AC compresor before?