TESLA-CP_A054 moderate Tesla Charge Port (CP)

Charge Port Latch Not Engaged (AC Charging Limited, No Supercharging)

The TESLA-CP_A054 (Tesla Charge Port (CP)) EV fault code means: Charge Port Latch Not Engaged (AC Charging Limited, No Supercharging). This is a moderate severity code.

My Garage →
Keep driving?
Yes, but fix soon
DIY difficulty
easy
Estimated cost
$0 in the common case (reseating the cable or clearing an obstruction). A genuinely faulty charge port latch is diagnosed and quoted by Tesla service.
Built for Diesel — Not a Car Reader
ANCEL HD7000 Heavy-Duty Diesel Scanner

A $30 car code reader can't do diesel. The HD7000 reads full-system codes and does parked DPF regen, idle/speed-limit, and service resets from the cab — on everything from a 6.7 Cummins/Power Stroke/Duramax pickup to Class-8 trucks (Detroit, Paccar, CAT, Volvo, Mack, International).

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

Lower-Cost Diesel Option
FOXWELL HD301 Diesel Truck Scanner

Full-system 6/9/16-pin diesel scan tool for Cummins, Paccar, CAT, Detroit and more — plug-and-play, no subscription. A cheaper way to read heavy-duty codes a basic OBD2 scanner skips entirely.

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

Common Symptoms

  • Alert on the touchscreen: "Charge port latch not engaged — Fully insert charge cable or check for obstruction"
  • AC charging limited to 16A (much slower than normal)
  • DC fast charging / Supercharging unavailable
  • Charge port light pulses amber during AC charging, or shows solid amber when attempting to Supercharge

Probable Causes (Ranked by Likelihood)

  • The charge cable is not fully inserted into the charge port inlet Likely
  • Debris, moisture, or a foreign object in the charge port inlet or on the cable connector preventing the latch from engaging Possible
  • The charge port latch manual release cable (in the trunk) has been pulled or is snagged by cargo, holding the latch open Possible

Step-by-Step Diagnostic Procedure

  1. Re-insert the charge cable fully into the charge port. If charging starts and the port light pulses green, the cable simply wasn't fully seated — full-speed AC and Supercharging should be back.

  2. If still limited, inspect the charge port inlet and cable connector for debris, moisture, or foreign objects; clear any obstruction and let moisture dry before retrying.

  3. Check the charge port latch manual release cable on the left side of the trunk: make sure it hasn't been pulled and that nothing (cargo net, umbrella, etc.) is attached to or snagging its handle.

  4. Per Tesla, this alert usually points to the external equipment or an obstruction rather than a vehicle fault needing service — but if it persists after all the above with multiple cables, have Tesla service check the latch.

Frequently Asked Questions

What does CP_a054 mean on a Tesla?

Tesla's official meaning: the charge port latch can't latch the charge cable. Until it engages, AC charging is limited to 16A and DC fast charging / Supercharging is unavailable. The port light pulses amber on AC or shows solid amber when you try to Supercharge.

Why is my Tesla charging so slowly with CP_a054?

With the latch not engaged, the vehicle deliberately limits AC charging to 16A and blocks Supercharging. Fix the latch engagement — usually by fully reseating the cable or clearing debris from the port — and normal speeds return.

How do I fix CP_a054?

Re-insert the cable fully; check the port and connector for debris or moisture; and make sure the manual release cable in the trunk hasn't been pulled or snagged. If the alert persists across multiple chargers after that, have Tesla service inspect the latch.

Sources

This page is built from documented references. Verify against your own service info before repair work.

Explore More

Tesla home All diesel codes Heavy-duty Guides