BMS-A135
BMS_a135_HW_BMB_Diagnostics_Failure
Also written as BMS_A135 / BMS A135 / BMS_a135_HW_BMB_Diagnostics_Failure / bms_a135_hw_bmb_diagnostics_failure
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-A135 mean?
Tesla alert code in the Battery Management System (BMS) module. BMS detected a pattern test failure on a BMB The BMS runs the BMB pattern diagnostics and detects a deviation from the expected results for any device in the chain The BMS runs the BMB pattern diagnostics and receives the expected results for all devices in the chain May indicate a potential BMB hardware failure which could manifest in more severe alerts from faulty BMB readings CAC difference of bricks within a module exceeds threshold Indicates that a brick's voltage slope is significantly less than the average. A brick has fallen below the minimum brick voltage BMS has detected that one or more BMB devices exceed the over temperature threshold
Original Description
BMS detected a pattern test failure on a BMB The BMS runs the BMB pattern diagnostics and detects a deviation from the expected results for any device in the chain The BMS runs the BMB pattern diagnostics and receives the expected results for all devices in the chain May indicate a potential BMB hardware failure which could manifest in more severe alerts from faulty BMB readings CAC difference of bricks within a module exceeds threshold Indicates that a brick's voltage slope is significantly less than the average. A brick has fallen below the minimum brick voltage BMS has detected that one or more BMB devices exceed the over temperature threshold
Affected Tesla Models
What You May Notice
- BMS-A135 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-A135 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.