DI-W166
DI_w166_hvilOutOfBounds
Also written as DI_W166 / DI W166 / DI_w166_hvilOutOfBounds / di_w166_hviloutofbounds
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 DI-W166 mean?
Tesla warning code in the Drive Inverter (DI) module. The drive inverter (DI) has detected that the high voltage interlock loop (HVIL) voltage is outside of the specified range. This alert only applies to small drive units. This alert is set if HVIL voltage is +/-0.3 volts or +/- 1.5ma the nominal value. This alert can be falsely triggered when the DI is outputting higher torque. This alert alone is not enough to identify an HVIL issue.
Original Description
The drive inverter (DI) has detected that the high voltage interlock loop (HVIL) voltage is outside of the specified range. This alert only applies to small drive units. This alert is set if HVIL voltage is +/-0.3 volts or +/- 1.5ma the nominal value. This alert can be falsely triggered when the DI is outputting higher torque. This alert alone is not enough to identify an HVIL issue.
Affected Tesla Models
What You May Notice
- drive inverter warning: The drive inverter (DI) has detected that the high voltage interlock loop (HVIL) voltage is outside of the specified ran
- 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
DI-W166 is a Warning in the Drive Inverter system. Schedule service soon. Monitor your vehicle for additional warnings.