BMS-A004
BMS_a004_SW_Incomplete_Hot_Seal_Test
Also written as BMS_A004 / BMS A004 / BMS_a004_SW_Incomplete_Hot_Seal_Test / bms_a004_sw_incomplete_hot_seal_test
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-A004 mean?
Tesla alert code in the Battery Management System (BMS) module. The pack hot seal test has not completed in the lifetime of this vehicle Sets when the vehicle turns on by default, if there is no history of having completed this test in the past Run coolant through the battery loop above the warm coolant threshold for the specified time period This test should complete as a source of tracability for the pump system as a mitigation for a hardware issue
Original Description
The pack hot seal test has not completed in the lifetime of this vehicle Sets when the vehicle turns on by default, if there is no history of having completed this test in the past Run coolant through the battery loop above the warm coolant threshold for the specified time period This test should complete as a source of tracability for the pump system as a mitigation for a hardware issue
Affected Tesla Models
What You May Notice
- BMS-A004 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-A004 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.