Code VCFRONT_a370 was reported by the “Front vehicle controller” controller in the car. The letter “a” in the middle places it among entries of the alert type.
Vehicle Controller Front — the front body controller. It handles the 12 V supply, the frunk, lights, wipers, pumps and cooling valves. One of the most frequently reported groups, because 12 V battery problems land here too.
The most common type. The car logged the event and may have shown it on the screen. The range is wide — from something trivial that clears itself to something that needs attention.
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.
There isn't enough energy in the high voltage battery to support the low voltage battery.
The 12V battery state machine has determined that the 12V battery needs to be recharged, but the high voltage BMS reports that there isn't enough energy in the high voltage battery to support.
Enough energy in the high voltage battery.
The 12V battery may be damaged if the vehicle isn't charged soon. The 12V battery could completely discharge and the vehicle will need to be jumped.
The iBooster eFuse was retried because it false tripped due to inrush.
On transition into the ACCESSORY vehicle state if the eFuse tripped within 1 second of the enable line going high.
Delay in having power brakes available to the user.
The battery is being overcharged more than 5 amphours after multiple consecutive charge cycles.
Battery has recharged more than 5Ah above what was discharged multiple times.
Battery is no longer overcharging 5Ah above what it was discharged.
The 12V Battery may be going into thermal runaway, it should be replaced.
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.