TESLA-CP_A143 moderate Tesla Charge Port (CP)

Charging Adapter Has Electric Arc Flash Hazard — Use Different Equipment

The TESLA-CP_A143 (Tesla Charge Port (CP)) EV fault code means: Charging Adapter Has Electric Arc Flash Hazard — Use Different Equipment. This is a moderate severity code.

My Garage →
Keep driving?
Yes, but fix soon
DIY difficulty
easy
Estimated cost
$0 for the vehicle — replace the third-party adapter (or use adapter-free charging). The hazard is in the adapter, not the car.
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Common Symptoms

  • Alert on the touchscreen: "Charging adapter has electric arc flash hazard — Use different charging equipment"
  • Charging unavailable while a third-party CCS charging adapter is connected
  • Driving is unaffected

Probable Causes (Ranked by Likelihood)

  • The vehicle detected an electric arc flash hazard in the third-party charging adapter connecting a CCS charge handle to the charge port (Tesla's official description) — unplugging such an adapter while actively charging can cause an arc flash Likely

Frequently Asked Questions

What does CP_a143 mean on a Tesla?

Tesla's official meaning: the vehicle detected an electric arc flash hazard in the third-party adapter being used to connect a CCS charge handle to the charge port, and blocked charging. An arc flash during a live disconnect can cause serious injury, so the vehicle refuses to charge through that adapter.

Is CP_a143 dangerous?

The vehicle has already protected you by refusing to charge — the danger is in disconnecting carelessly. Follow Tesla's sequence: stop charging on both the touchscreen and the station, confirm no flashing green/blue charge-port light, then unplug the adapter from the car first and the handle second. Stop using that adapter.

Can I keep using my CCS adapter after CP_a143?

No — Tesla's guidance is to use different charging equipment. Replace the flagged adapter; if you need CCS charging regularly, use a known-good adapter (correct type, good condition) or adapter-free Tesla charging.

Mechanics Guide Step-by-step diagnosis

Step-by-Step Diagnostic Procedure

  1. SAFETY FIRST — Tesla's official warning: an electric arc flash can occur if you unplug while actively charging with the third-party adapter, and it can cause serious bodily injury and/or property damage. Do not yank anything while a session may be live.

  2. Follow Tesla's official disconnect sequence: (1) confirm charging is completely stopped on the vehicle touchscreen AND on the charging station's display/controls; (2) confirm no flashing green or blue light on the vehicle's charge port; (3) unplug the adapter from the vehicle's charge port; (4) confirm again the station shows no active session; (5) unplug the adapter from the charge handle.

  3. Then use different charging equipment — do not continue using the flagged third-party adapter.

  4. A Tesla Supercharger or Destination Charger needs no adapter and is the safe fallback.

Sources 4

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

Commonly Affected Vehicles

  • Tesla Model 3
  • Tesla Model Y
  • Tesla Model S
  • Tesla Model X
  • Tesla Cybertruck

Related Codes

TESLA-CP_A139TESLA-PCS_A053

Explore More

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