Code THC_d0005 was reported by the “Heating and air conditioning” controller in the car. The letter “d” in the middle places it among entries of the diagnostic entry type.
Thermal management — air conditioning, the high-voltage cabin heater, the coolant loop and its level. These codes show up as weak heating, limited defrosting or a low coolant level message.
A service record that is not shown to the driver. Only a technician sees it in diagnostics.
This is how the fault is named inside the car's firmware. For codes without a description it is the most precise clue there is — the name itself says what the event is about.
The text below comes from Tesla's technical documentation. We leave it in the original English so that translation cannot shift its meaning.
The coolant pump DTC is set on the Thermal Controller (THC) if the following warnings occur repeatedly over a specific time frame. THC_w0039_pumpPTLimp is set for 300 seconds or 100 times with less than 30 minutes between each occurrence. THC_w0040_pumpPTStop is set for 120 seconds or 10 times with less than 30 minutes between each occurrence. THC_w0044_sanityPumpPT is set for 120 seconds or 100 times with less than 30 minutes between each occurrence. THC_w0045_pumpPTFaultMax is set for 300 seconds or 100 times with less than 30 minutes between each occurrence.
Diagnose the pump condition by investigating the relevant pump alert article(s) under Possible Causes.
Copy it exactly, letter and number included. Photographing the screen is safest — codes often differ by a single digit, and mixing them up leads somewhere else entirely.
Some codes clear after a screen restart or after the car sits locked for a few hours. If the code does not come back, it was usually a one-off glitch.
A one-off entry and a code that appears after every drive are two different things. It helps a service centre enormously if you know exactly when it shows up.
With airbags, brakes, steering and high voltage there is no point waiting it out. With the other groups you can watch and see whether the code returns at all.
Error codes are only part of the picture. For cars on TesList you also see battery health pulled straight from the vehicle, plus a price calculator that works out from current listings what a given car is actually worth today.