2 errors : Acceleration and top speed reduced, vehicle may not restart

[Samer othman]

 

[FoxSTL2HOU]

Update: I got my car back today (it was really ready at the end of yesterday, but I couldn't get over there then). The part that was ordered and replaced was:

MDL S, DM, THERM SYS, ELEC BATT HEATER(1038901-00-K)

Out of pocket would have about $700, but I only paid the extended service agreement deductable of $200. Everything seems good now.

Communication with the service advisor was all by SMS, but he was quite responsive to a couple of messages I sent. They even charged my car before I picked it up. Overall a very satisfactory service experience.

Bruce.

We had two very brief "Vehicle May Not Restart" messages pop-up - one for a couple seconds Monday morning, one for for a couple seconds Tuesday night (but neither had an error code attached). Already had a service appt scheduled, so just messaged via app to have them pull the logs.

Just got a "parts update" email, and the Elec Batt Heater 1038901-00-K part is the one ordered. Since we're out of warranty, here comes another $700...

EDIT: Did searching on the part name instead of part number to see this is apparently related to supercharging...this past Sunday was the first time the car was ever charged at a 150 kW SC, so I'm going to blame that.

 

[KingRaptor]

I had the same issue on my late 2016 Model X days before the warranty expired.

My issue also occurred after supercharging (specifically after the car preconditions the battery for supercharging).

Turned out it was my battery heater as well. I think originally, these cars did not precondition battery for supercharging and a recent software update either started doing the preconditioning or was more aggressive about it on older cars. The battery heater may have been dormant and kind of broken but never was used in this manner so it never previously triggered the issue.