Submitted by iblorico on July 30, 2019
My 2014 MS 85 lost power and shut down in both different times while driving and supercharging. It happened twice in about a month. Both times the vehicle was not drivable and had to be towed to two different service centers. I've had this vehicle for 5 years and never experience anything like this. I took it for service both times and there was no resolution to the issue. While I comply with the service advisor's recommendations I'm also asking for any advice here.
The first incident happened on 6-16-19 when I was driving then several alerts appeared on the dash. Messages showed in the following order:
"Car needs service: Car may not restart"
"Car needs service: PULL OVER SAFELY"
"Power reduced: Vehicle system down"
Then I noticed a total power shutdown. The vehicle had to be towed to the Burlingame, CA. service center (SC). The vehicle was in service for 1 week. I was told by the advisor the most likely cause was a change in voltage going through High Voltage Interlock Loop (HVILP) but since the technician wasn't able to reproduce the problem they can't repair it. I was advised to keep it running and drive straight to the nearest SC next time it happens and take pictures.
Several weeks later the second incident happened on 7-13-19 when I was supercharging. A single message appeared: "Power reduced: Vehicle system shutting down." Again, I experienced a total power shutdown and the vehicle had to be towed to San Francisco, CA. SC this time. I had to pay the towing fee ($500) upfront since Tesla Roadside assistance stated that my vehicle is out of warranty except for the battery pack and drive train. Two weeks and three days today, I got a call from the service advisor (and daily updates) with similar feedback from the last time. I was told the technicians couldn't reproduce the problem and no repairs were made other than tightening a single loose electrical cable.
Has anyone experienced any failure with the HVILP before?