TAS2-A201
TAS2_a201_lowHVBattery
Also written as TAS2_A201 / TAS2 A201 / TAS2_a201_lowHVBattery / tas2_a201_lowhvbattery
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 TAS2-A201 mean?
Tesla alert code in the Thermal Architecture System v2 (TAS2) module. This alert is a load-shed request from Gateway (GTW) due to the voltage of the LV bus. Set: This alert is set when the GTW sends the CH_hvBatteryLow signal, which is a carry-over signal from Electronic Air Suspension (EAS). Despite the name of the alert, this message indicates to the air suspension controller that the LV system (not necessarily the LV battery or HV battery) is at a low voltage, and so it sends the controller into a limp mode to reduce the electrical loading on the LV system. It is likely to see this during a load-shed event where the LV system is not being properly supported by the DCDC. Clear: Clearing of the low high-voltage battery signal (CH_hvBatteryLow).
Original Description
This alert is a load-shed request from Gateway (GTW) due to the voltage of the LV bus. Set: This alert is set when the GTW sends the CH_hvBatteryLow signal, which is a carry-over signal from Electronic Air Suspension (EAS). Despite the name of the alert, this message indicates to the air suspension controller that the LV system (not necessarily the LV battery or HV battery) is at a low voltage, and so it sends the controller into a limp mode to reduce the electrical loading on the LV system. It is likely to see this during a load-shed event where the LV system is not being properly supported by the DCDC. Clear: Clearing of the low high-voltage battery signal (CH_hvBatteryLow).
Affected Tesla Models
What You May Notice
- Thermal Architecture System v2 alert: This alert is a load-shed request from Gateway (GTW) due to the voltage of the LV bus. Set: This alert is set when the G
- Reduced charging speed in cold weather or battery pre-conditioning required
- HVAC performance may be slightly affected
How to Diagnose and Resolve
- 1 Reboot the vehicle
- 2 Check coolant levels if accessible (Model S/X only)
- 3 Avoid DC fast charging until battery temperature normalizes
- 4 Schedule service if the alert appears in warm ambient conditions
Severity Notes
TAS2-A201 is an Alert in the Thermal Architecture System v2 system. Confirm the vehicle screen and Tesla app show no driving or charging restrictions, and schedule service if the alert returns.