Code CC_a044 was reported by the “Wall Connector” controller in the car. The letter “a” in the middle places it among entries of the alert type.
The controller inside the Tesla Wall Connector. These codes describe the state of the home installation — connector temperature, pilot signal, earthing, supply voltage. The fault therefore sits in the charger or the wiring, not in the car.
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.
Wall connector relay coils are at an unexpected voltage, usually due to overheating or other damage
Relay coil voltage is out of the expected range for the current state of the relays
Relay coil voltage returns to normal levels
Wall connector requires configuration via the web UI before it can operate
Wall connector does not have necessary parameters configured
All needed configuration items are complete
The Wall connector will not charge vehicles
More than one wall connector is configured as a master on the sharing network
info from manualCC_A022
More than one wall connector configured as a master was detected on the sharing network
Wall connector detects only one master on the sharing network
Wall connctor input wiring temperature too high
info from manualCC_A012
Wall connector input wiring temperature exceeds 100 C
Wall connector input wiring temperature falls below 80 C or user interaction if charging was stopped
Cotactors opened due to measured current exceeding configured unit current limit or sharing network allocated current
info from manualCC_A006
Measured current exceeds configured limit or sharing network allocation by 10 percent + 1 A RMS
Contactors opened for 10 seconds and less than 4 automatic retry attempts or charge cable cycled
Wall connector will stop charging and retry at most three times before waiting for the cable to be cycled
Wall connector internal watchdog timer expired and the unit is about to reboot
A software bug or upset caused the watchdog timer to expire
Condition will clear upon reboot
Charging will be momentarily interrupted
The UHF receiver reset behavior has successfully recovered communication with the UHF receiver
The charge port (CP) has detected a missing control pilot signal while a charge cable is connected, which usually indicates the charge station does not have power. Charging may not start, and it may be necessary to try a different charge station.
info from manualCP_A053
Proximity is detected with no control pilot signal and no digital communications, and the vehicle is not charging.
The charge handle is unplugged, or proximity with either a control pilot signal or digital communications is detected.
Door is closed but prox or pilot are still sensed
The door is detected closed with proximity or pilot detected present
The door is detected closed with neither proximity nor pilot detected
Charge port door assembly may be broken, door may not operate as designed
GB DC charger faulted due to connector issue
info from manualCP_A067
GB DC charger sends stop message with connector faulted bit set
GB DC charging may not start or may be interrupted. Issue could be caused by charge station
Expected user interface (UI) controller area network (CAN) messages are missing. Charge port door may not open when request is made via the user interface (UI) or mobile app.
Charge port (CP) does not receive all expected controller area network (CAN) messages from the user interface (UI).
Charge port (CP) receives all expected controller area network (CAN) messages from the user interface (UI).
Charge port (CP) door may not open with user interface (UI) or mobile app controls.
GB CC1 or CC2 unexpectedly disconnected during charge
CC1 or CC2 is detected as disconnected while in the active GB DC charging state
The door inductive sensor reports the door is closed
Charging may be interrupted unexpectedly, possible damage to charge inlet if live disconnected under load
DC pin temperature has exceeded the maximum allowed temperature for more than 500ms
Charge cable is unplugged or DC pin temperature is irrational
Charging may be interrupted unexpectedly
The charge port DC pin temperatures have entered a region where its thermal foldback limits are dynamically changing
The charge port DC pin temperature hits its active threshold
The charge port DC pin temperature drops 5C below its active threshold
DC charge current may be limited
Silent alert to indicate that the proximity based thermal foldback was detected
The CP has detected that the CHAdeMO adapter has measured a temperature at which charging should begin to fold back
The CHAdeMO adapter reports a temperature that is higher than desired steady state operation
Cleared if the charge cable is disconnected
Supercharging is unavailable because the post is out of service
The Supercharger reports to the vehicle that the post is out of service
The cable is unplugged or the Supercharger reports that it is no longer out of service
Charging will not start at supercharger stall
PlcForward module detected an error has occured
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.