BMS-A142
BMS_a142_SW_Isolation_Degradation
Also written as BMS_A142 / BMS A142 / BMS_a142_SW_Isolation_Degradation / bms_a142_sw_isolation_degradation
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 BMS-A142 mean?
Tesla alert code in the Battery Management System (BMS) module. HV isolation is approaching a level too low for the vehicle to operate HV isolation is low, but above the sufficient level for vehicle operation Increase isolation resistance between HV system and vehicle chassis May indicate coolant leakage. Brick instability may be observed (a020) BMS does not have valid data for one or more brick voltages
Original Description
HV isolation is approaching a level too low for the vehicle to operate HV isolation is low, but above the sufficient level for vehicle operation Increase isolation resistance between HV system and vehicle chassis May indicate coolant leakage. Brick instability may be observed (a020) BMS does not have valid data for one or more brick voltages
Affected Tesla Models
What You May Notice
- BMS-A142 may appear with another Tesla alert in the Battery Management System (BMS) system.
- The vehicle may limit charging, driving, comfort, or safety features depending on the active alerts.
- The alert may clear after sleep, but recurring alerts should be treated as service-relevant.
How to Diagnose and Resolve
- 1 Reboot the vehicle (hold both scroll wheels for 10 seconds)
- 2 Check the Tesla app for any pending software updates
- 3 Monitor the alert over 1–2 charge cycles; schedule service if it recurs
Severity Notes
BMS-A142 is an Alert in the Battery Management System system. Confirm the vehicle screen and Tesla app show no driving or charging restrictions, and schedule service if the alert returns.