TESLA Warning

CHG-W125

CHG_w125_leakageTestFailure

Also written as CHG_W125 / CHG W125 / CHG_w125_leakageTestFailure / chg_w125_leakagetestfailure

System
CHG
Charger
Type
Warning
Category
Charging
Severity
Warning

Why does the exact Tesla alert ID matter?

Record the exact alert ID, including underscores, suffixes, and companion alerts. Tesla alerts that look similar can point to different modules, timestamps, and service procedures.

What does CHG-W125 mean?

Tesla warning code in the Charger (CHG) module. This fault indicates that the voltage decay after the supercharger external isolation test has happened too quickly. During supercharger startup, the supercharger will open the output contactors after performing the external isolation test at 300V. The vehicle then monitors the time it takes for the 300V to decay. If the decay time is sufficient, the start-up sequence proceeds. The purpose of this test is to check the common mode isolation (DC+ to DC-) of the high voltage chain from the supercharger cabinet to the vehicle's fast charge contactors.

Original Description

This fault indicates that the voltage decay after the supercharger external isolation test has happened too quickly. During supercharger startup, the supercharger will open the output contactors after performing the external isolation test at 300V. The vehicle then monitors the time it takes for the 300V to decay. If the decay time is sufficient, the start-up sequence proceeds. The purpose of this test is to check the common mode isolation (DC+ to DC-) of the high voltage chain from the supercharger cabinet to the vehicle's fast charge contactors.

Affected Tesla Models

Model SModel XModel 3Model YCybertruck

What You May Notice

  • Charger alert: This fault indicates that the voltage decay after the supercharger external isolation test has happened too quickly. Dur
  • Charging notification in the Tesla app

How to Diagnose and Resolve

  1. 1 Reboot the vehicle and retry charging
  2. 2 Try a different cable or Wall Connector
  3. 3 Schedule service if AC charging consistently underperforms

Severity Notes

CHG-W125 is a Warning in the Charger system. Schedule service soon. Monitor your vehicle for additional warnings.

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