Is DIS_W021 the same as DIS-W021?

Yes. DIS_W021, DIS W021, and DIS-W021 are alternate spellings of the same Tesla alert code. Also written as: DIS-W021, DIS_W021, DIS W021, DIS_w021_hwBusOV, dis_w021_hwbusov.

What symptoms can DIS-W021 cause?

secondary inverter warning: The Secondary Drive Inverter (DIS) detected an over-voltage condition in the High Voltage (HV) system. Reduced acceleration or "Reduced Power" message on the touchscreen Higher than normal energy consumption during driving

What should I check for DIS-W021?

1. Reboot the vehicle by holding both scroll wheels 2. Avoid aggressive acceleration until the alert clears 3. Schedule a Tesla Service appointment within the next few days 4. Check for available OTA updates in Controls > Software

Is it safe to drive with DIS-W021?

🟡 Check the vehicle display for drive or charge restrictions and schedule service promptly.

TESLA Warning

DIS-W021

DIS_w021_hwBusOV

Also written as DIS_W021 / DIS W021 / DIS_w021_hwBusOV / dis_w021_hwbusov

System

DIS

Drive Inverter Secondary

Type

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 DIS-W021 mean?

Tesla warning code in the Drive Inverter Secondary (DIS) module. The Secondary Drive Inverter (DIS) detected an over-voltage condition in the High Voltage (HV) system.

Original Description

The Secondary Drive Inverter (DIS) detected an over-voltage condition in the High Voltage (HV) system.

Affected Tesla Models

Model SModel XCybertruck

What You May Notice

secondary inverter warning: The Secondary Drive Inverter (DIS) detected an over-voltage condition in the High Voltage (HV) system.
Reduced acceleration or "Reduced Power" message on the touchscreen
Higher than normal energy consumption during driving

How to Diagnose and Resolve

1 Reboot the vehicle by holding both scroll wheels
2 Avoid aggressive acceleration until the alert clears
3 Schedule a Tesla Service appointment within the next few days
4 Check for available OTA updates in Controls > Software

Severity Notes

DIS-W021 is a Warning in the Drive Inverter Secondary system. Schedule service soon. Monitor your vehicle for additional warnings.

Other DIS Codes

DIS_f001 Tesla fault code in the Drive Inverter Secondary (DIS) modul... DIS_f002 Tesla fault code in the Drive Inverter Secondary (DIS) modul... DIS_f003 Tesla fault code in the Drive Inverter Secondary (DIS) modul... DIS_f004 DIS_f005 DIS_f006 Tesla fault code in the Drive Inverter Secondary (DIS) modul... DIS_f010 Tesla fault code in the Drive Inverter Secondary (DIS) modul... DIS_f011 Tesla fault code in the Drive Inverter Secondary (DIS) modul...

View all DIS codes →