BMS-F150
BMS_f150_SW_precharge_too_long
Also written as BMS_F150 / BMS F150 / BMS_f150_SW_precharge_too_long / bms_f150_sw_precharge_too_long
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-F150 mean?
Tesla fault code in the Battery Management System (BMS) module. If the contactors are trying to close and the Direct Current (DC) link voltage rise does not match a time constant with a 35% tolerance, then a precharge fault shall be asserted and precharge aborted. During the precharge sequence when the Battery Management System (BMS) is closing the contactors, the time it takes to reach target precharge voltage is too long. The precharge taking too long means that the voltage on the DC Link bus (vehicle side of contactors) rose slower than expected, similar to how if there was too much capacitance or resistance to chassis on the bus
Original Description
If the contactors are trying to close and the Direct Current (DC) link voltage rise does not match a time constant with a 35% tolerance, then a precharge fault shall be asserted and precharge aborted. During the precharge sequence when the Battery Management System (BMS) is closing the contactors, the time it takes to reach target precharge voltage is too long. The precharge taking too long means that the voltage on the DC Link bus (vehicle side of contactors) rose slower than expected, similar to how if there was too much capacitance or resistance to chassis on the bus
Affected Tesla Models
What You May Notice
- Red warning light on dashboard: If the contactors are trying to close and the Direct Current (DC) link voltage rise does not match a time constant with
- Vehicle may refuse to drive or charge until the fault is cleared
- Sudden power reduction or shutdown may occur while driving
How to Diagnose and Resolve
- 1 Stop driving immediately and move to a safe location
- 2 Do not attempt to charge the vehicle — active fault: "If the contactors are trying to close and the Direct Current"
- 3 Call Tesla Roadside Assistance (+1-877-798-3752) for a flatbed tow
- 4 At the Service Center, Tesla technicians will inspect the HV battery pack and BMS firmware
Severity Notes
BMS-F150 is classified as a Fault, indicating a critical issue in the Battery Management System system. Do not continue driving and contact Tesla Service immediately.