TAS-A074
TAS_a074_shortCircuit5VOffBoard
Also written as TAS_A074 / TAS A074 / TAS_a074_shortCircuit5VOffBoard / tas_a074_shortcircuit5voffboard
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 TAS-A074 mean?
Tesla alert code in the Thermal Architecture System (TAS) module. Off board 5V switched supply is measured to be approximately 0V. Rear axle has been measured to be lower than any reasonable height. Rear axle has been measured to be lower than any reasonable height for an extended period. Rear axle has been measured to be not be lower than any reasonable height for an extended period. Rear right air valve has reached its duty cycle (on time) limit. Rear right air valve has dropped below its duty cycle (on time) limit, plus some hysteresis. Air suspension leveling will be temporarily disabled until rear right air valve duty cycle drops. Signal line from rear right PWM height sensor shorted to ground.
Original Description
Off board 5V switched supply is measured to be approximately 0V. Rear axle has been measured to be lower than any reasonable height. Rear axle has been measured to be lower than any reasonable height for an extended period. Rear axle has been measured to be not be lower than any reasonable height for an extended period. Rear right air valve has reached its duty cycle (on time) limit. Rear right air valve has dropped below its duty cycle (on time) limit, plus some hysteresis. Air suspension leveling will be temporarily disabled until rear right air valve duty cycle drops. Signal line from rear right PWM height sensor shorted to ground.
Affected Tesla Models
What You May Notice
- Thermal Architecture System alert: Off board 5V switched supply is measured to be approximately 0V. Rear axle has been measured to be lower than any reason
- 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
TAS-A074 is an Alert in the Thermal Architecture System system. Confirm the vehicle screen and Tesla app show no driving or charging restrictions, and schedule service if the alert returns.