If a Model 3 accepts the cable but charging is limited, photograph the full alert before leaving the charger. CP_a054 and CP_a079 concern securing the connector, so the cable’s position and the weather belong in the fault description.
What Tesla says about these alerts
The Model 3 manual describes CP_a054 as a latch that has not secured the cable. In that condition it lists AC charging limited to 16 A and DC charging unavailable. CP_a079 adds cold conditions and a potentially frozen latch. These restrictions are not, by themselves, a diagnosis of a failed traction battery.
For a suspected frozen latch, Tesla describes using Defrost Car in the app. Follow the current manual for the fitted vehicle. Do not force the connector or put tools into the charging contacts.
Record the pattern, not just the last attempt
Useful notes include whether the warning appeared with one cable or more than one, whether it started in freezing weather and whether the same connection had previously worked. Say whether the cable would not lock in place or would not release; those are different complaints.
If the port, plug or cable is visibly damaged, stop using it and arrange help. Repeated attempts with damaged equipment will not produce a useful comparison. Photographs should show the outside of the connection without dismantling it.
A failed session needs context
The charger’s advertised output is not a measurement of what the car accepted. Keep the session record showing the actual result, together with the alert and approximate battery percentage. A payment or account error should also be included rather than omitted from the story.
If the problem persists, send AXION the alert and vehicle details. Tell us which ordinary owner checks have already been tried so the same steps are not repeated unnecessarily. We will confirm whether a vehicle-side charging assessment is suitable before arranging a visit.