Received word today from Tesla Service that my 2015 Model S 85D needs the battery heater (MDL S, DM, THERM SYS, ELEC BATT HEATER 1038901-00-K) replaced (along with some associated small parts, like a bolt). That portion of the service estimate comes out to $890 before tax.
This would be the second the time the battery heater would have been replaced; it was replaced two years ago (Jan 2021) with the same part number/rev (1038901-00-K).
At that time, I received a one-off "vehicle may not restart notice" that prompted my service request, but was told/was of the understanding that the heater was responsible for the pre-heating/optimization of the HV battery for (super)charging.
If that assumption is true (the heater is only useful for supercharging), I would choose to not replace the item as I'm 99% home charging anyway and really don't feel like paying the same $900 over and over. But...I'm seeing other posts getting repeat "Vehicle may not restart" errors along with others, such as "BMS_u008 Acceleration and Top Speed Reduced" and losing regen (Dead battery heater).
Q: Has anyone NOT replaced their knowingly-failed battery heater, and what have been the consequences, if any?
This would be the second the time the battery heater would have been replaced; it was replaced two years ago (Jan 2021) with the same part number/rev (1038901-00-K).
At that time, I received a one-off "vehicle may not restart notice" that prompted my service request, but was told/was of the understanding that the heater was responsible for the pre-heating/optimization of the HV battery for (super)charging.
If that assumption is true (the heater is only useful for supercharging), I would choose to not replace the item as I'm 99% home charging anyway and really don't feel like paying the same $900 over and over. But...I'm seeing other posts getting repeat "Vehicle may not restart" errors along with others, such as "BMS_u008 Acceleration and Top Speed Reduced" and losing regen (Dead battery heater).
Q: Has anyone NOT replaced their knowingly-failed battery heater, and what have been the consequences, if any?