Code CP_a074 was reported by the “Charge port” controller in the car. The letter “a” in the middle places it among entries of the alert type.
The car's charge port — latch, connector lock, indicator light and proximity sensor. These codes typically appear when the connector will not lock or the car does not register that it is plugged in.
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.
The charge port was unable to initialize the non-volatile memory module
PLC modem expected to be depopulated but established communication successfully
PLC modem responded when verifying that it is not populated
Supercharging blocked because option not enabled
The CP detects that a Supercharger is plugged in, but the car configuration indicates that supercharging is not allowed
The Supercharger is unplugged, or the car configuration enables supercharging
The CP does not detect that the latch assembly is connected to the CP ECU
The CP confirms that the latch assembly is connected to the CP ECU
Charge rate may be reduced, DC charging may be blocked
Latch has been manually disengaged
The latch transitions to the disengaged state from engaged or blocking without actuating it
Any door sensor detects the door is closed, and no cable is connected
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.