Code CHG_w063 was reported by the “Onboard charger” controller in the car. The letter “w” in the middle places it among entries of the warning type.
The charger inside the car that converts AC from the socket into DC for the battery. These codes cover AC charging problems — grid fluctuations, high line impedance, overheating.
The car is flagging that something is not right. Driving is usually still possible, but some function may be limited.
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 charger could not determine the state of the fast charge contactors or the fast charge contactors may be welded.
If this alert is present on vehicles with Gen 1, 2, and 3 chargers, CHG_a063_FCNegCntrWelded should also be set to provide additional alert data.?
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.