Code APS_w065 was reported by the “Autopilot — secondary processor” controller in the car. The letter “w” in the middle places it among entries of the warning type.
The second, supervising processor inside the Autopilot computer. It checks the primary processor's work and guards safety functions, chiefly automatic emergency braking. Codes from here often accompany APP codes and clear once camera calibration finishes.
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.
Warns if vechile starts departing current lane right after Autosteer is disengaged
AP detects that vehicle is departing lanes within a few seconds of disengaging Autosteer
Driver takes over control by putting hands on steering wheel
Visual and audible warning is issued to the driver to avoid the lane departure
PMM applying brakes to avoid collision
Potential collision conditions present due to incorrect pedal application
AP will brake to avoid potential collision
APS does not receive one or more msgs from GTW for more than 10 cycles
Clears when GTW msgs are received again
Features that depend on GTW msgs will be disabled
Warns if one or more voltage rails fails to reach expected voltage level
One or more voltage rails fails to reach expected voltage level
All voltage rails report expected voltage levels
Some AP components may not be powered correctly
APS does not receive one or more msgs from Radar for more than 10 cycles
Clears when Radar msgs are received again
Features that depend on Radar msgs will be disabled
Pedal Misapplication Mitigation activated
AP will brake/prevent acceleration to avoid potential collision
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.