Code TAS2_a227 was reported by the “Air suspension — newer control board” controller in the car. The letter “a” in the middle places it among entries of the alert type.
The newer air suspension control board. The codes mean the same as the TAS group, and the descriptions tend to be more detailed — including how often each check runs.
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.
Alert is set to indicate that the front right (FR) height sensor temporarily faulted when 100%, 0%, or a large delta in the duty cycle was read from the front left (FL) pulse width modulation (PWM) height-sensor.
Duty cycle of 100% indicates an open circuit. Duty cycle of 0% indicates a short to ground. The alert will clear when one second of expected values is received from the FL height-sensor.
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.