Code PCS_a098 was reported by the “Power conversion system (PCS)” controller in the car. The letter “a” in the middle places it among entries of the alert type.
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The Power Conversion System — the combined onboard charger and DC/DC converter. It handles charging from the socket and generating the 12 V supply. These codes mostly show up as slower or interrupted charging.
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.
High DC offset present on charger output current sensor when charging is not enabled
Charger output current sensor offset exceeds threshold for more than three seconds while charging is inactive
Charger output current sensor offset is below clear threshold for more than 500ms
PCS output under-voltage detected while being commanded to charge
Charger DC output voltage is below minimum output voltage threshold
PCS charging input over-frequency
Charger AC input frequency exceeds maximum frequency threshold for more than one second
Charger AC input frequency is below maximum frequency threshold
PCS DCDC is not able to regulate LV output
DCDC converter 12V support regulator detects irrational condition
Charger DC output voltage exceeds maximum output voltage threshold
PCS DCDC detects pack voltage is lower than the safety threshold to continue its 12V support operation
DCDC converter detects that high voltage bus voltage is below undervoltage threshold
This part is written by you. If you have had code PCS_a098, tell us when it appeared, what brought it on and how it ended — for the next person, one such sentence is often worth more than the entire service documentation.
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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.