@wk057 posted some reasons for the pumps running, which could be related to the SoC loss:Might be something else. Are the pumps running? Is the car sleeping?
Reviewed logs from over 100 vehicles with 85 packs on recent firmwares over the past several months.
Pumps run because the contactors are engaged because the DCDC is called for by the gateway because the 12V voltage is too low. There was a change to the firmware sometime in 2019 that "mitigated" the weak 12V issue (ie, making it less likely to need to be replaced despite being weaker than normally permitted) by lowering the 12V float voltage once 12V capacity got lower than normal, which limited the amount of time the car can sit with the DCDC disengaged. For the DCDC to be engaged, the battery loop pump has to run since the DCDC coolant is in parallel with the battery pack (lookup the diag screen thermal screenshots).
TL;DR - Pumps running have nothing to do with the HV battery range loss issue or any other safety issue and everything to do with Tesla not replacing 12V batteries as often.
So a weak 12v battery could cause the DC-DC to stay enabled to keep the car operational. Which causes the pumps to run.
Or there could be some other component in the cooling system that has failed, or appears to have failed.All of that said, most cases I've found where pumps run at full or otherwise above what'd be considered normal vs just low circulating to keep the DCDC cool, end up being the result of a bad pump, fan, compressor, or some other item on the thermal control system not reporting in as it should be. This forces the system to run everything it can since it only has resulting readings as a measure of how effective things are performing.
Of course if either of those are the reason, it seems that the car knows about it, so it should let the owner know that it needs service so it can get fixed.