TAS-A157
TAS_a157_otherCircuitReservoir
Also written as TAS_A157 / TAS A157 / TAS_a157_otherCircuitReservoir / tas_a157_othercircuitreservoir
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-A157 mean?
Tesla alert code in the Thermal Architecture System (TAS) module. Implausible condition detected on reservoir air valve circuit. Implausible condition detected on reservoir air valve circuit, possibly due to ECU hardware failure. Implausible condition detected on front left air valve circuit, possibly due to ECU hardware failure.
Original Description
Implausible condition detected on reservoir air valve circuit. Implausible condition detected on reservoir air valve circuit, possibly due to ECU hardware failure. Implausible condition detected on front left air valve circuit, possibly due to ECU hardware failure.
Affected Tesla Models
What You May Notice
- Thermal Architecture System alert: Implausible condition detected on reservoir air valve circuit. Implausible condition detected on reservoir air valve cir
- 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-A157 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.