TAS2-A129
TAS2_a129_openCircuitFL
Also written as TAS2_A129 / TAS2 A129 / TAS2_a129_openCircuitFL / tas2_a129_opencircuitfl
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-A129 mean?
Tesla alert code in the Thermal Architecture System v2 (TAS2) module. This alert checks for open circuit faults every 10ms. Voltage and current are measured by Tesla Air Suspension Controller (TASC) when the front left (FL) valve is commanded with 12V. Set: The FL valve is commanded and both of the following are true: voltage is sensed between 11.4 - 12.6V current is sensed below 0.02A Clear: Single drive-rail cycle
Original Description
This alert checks for open circuit faults every 10ms. Voltage and current are measured by Tesla Air Suspension Controller (TASC) when the front left (FL) valve is commanded with 12V. Set: The FL valve is commanded and both of the following are true: voltage is sensed between 11.4 - 12.6V current is sensed below 0.02A Clear: Single drive-rail cycle
Affected Tesla Models
What You May Notice
- Thermal Architecture System v2 alert: This alert checks for open circuit faults every 10ms. Voltage and current are measured by Tesla Air Suspension Controlle
- 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-A129 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.