Code DI_a233 was reported by the “Drive inverter” controller in the car. The letter “a” in the middle places it among entries of the alert type.
The Drive Inverter — the power electronics that drive the motor. Codes from here show up as reduced power, a message about limited acceleration or, in worse cases, an inability to drive. Temperature codes are common too: the inverter protects itself under sustained load.
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.
Impact detected on a front wheel
Drive Inverter Warning: Proximity signal is irrational
Drive Inverter Warning: Cruise control CAN node is MIA
Drive Inverter Warning: Regen is Limited
info from manualDI_A201
The powertrain is limiting regen braking. This can be for multiple reasons: the battery pack is too hot or cold, the battery pack is fully charged, or the battery pack is limiting for another reason.
This alert will clear over time
The accelerator pedal might behave differently: it will provide less regen braking than normal when the accelerator pedal is fully depressed.
Drive Inverter User Alert: System Starting Up...
Drive Inverter Warning: Steering column control module is MIA
Drive Inverter User Alert: Autopark canceled
info from manualDI_A184
Drive Inverter Warning: DIR CAN node MIA
DI is not receiving required feedback CAN messages from DIR
DI receives required feedback CAN messages from DIR
Drive Inverter Warning: The park brake is MIA to the drive inverter and the park request could not be honoured.
Drive Inverter Warning: Front wheel speed signal error
Drive Inverter Warning: Vertical acceleration or yaw rate error
User has overridden frunk state
Double pull frunk and frunk open and system state enable
Frunk closure or system state not enable
Drive Inverter Warning: No battery power
Drive Inverter Warning: BMS (Battery Management System) node is MIA on CAN for one or multiple messages
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.