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Two (2) red blinks

Two red blinks — Ground assurance fault, high ground resistance detected

Tesla · Gen 3 Wall Connector

What does Two (2) red blinks mean?

Two red blinks indicate a ground assurance fault, meaning high resistance was detected in the ground connection, which has disabled charging.

Common Causes

  • Wall Connector is not properly grounded
  • Ground connection not bonded in the upstream power supply
  • Loose physical connections at wirebox terminals, electrical panel(s), or junction boxes
  • Issue with the bond between ground and neutral at the main panel

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify that the Wall Connector is properly grounded according to installation instructions.

  2. 2

    Ensure the ground connection is bonded in the upstream power supply for proper operation.

  3. 3

    Check all physical electrical connections, including wirebox terminals, electrical panel(s), and junction boxes.

  4. 4

    For residential power supplies, check the bond between ground and neutral at the main panel.

  5. 5

    If connected to a transformer, contact the transformer's manufacturer for guidance on bonding the ground connection.

Browse all codes in this manual (14)
Verified technical data. Last updated: April 2026

Related Faults

Blue solidBlue solid light — Waiting to charge, communicating with vehicleEvery green streamingEvery green streaming — Charging in progressFive (5) red blinksFive red blinks — Group power management communication issue, charging reduced
Source: Tesla Gen 3 Wall Connector
Open Manual (Page 55)Search more codes in this manual