TESLA Unknown

BMS-U020

BMS_u020_Cannot_Precharge_FC

Also written as BMS_U020 / BMS U020 / BMS_u020_Cannot_Precharge_FC / bms_u020_cannot_precharge_fc

System
BMS
Battery Management System
Type
Unknown
Category
Battery
Severity
Diagnostic / Info

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-U020 mean?

Tesla unknown code in the Battery Management System (BMS) module. The Battery Management System (BMS) has prevented the vehicle from precharging for fast charging.

Original Description

The Battery Management System (BMS) has prevented the vehicle from precharging for fast charging.

Affected Tesla Models

Model SModel XModel 3Model YCybertruck

What You May Notice

  • BMS-U020 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. 1 Reboot the vehicle (hold both scroll wheels for 10 seconds)
  2. 2 Check the Tesla app for any pending software updates
  3. 3 Monitor the alert over 1–2 charge cycles; schedule service if it recurs

Severity Notes

BMS-U020 is a diagnostic or informational code in the Battery Management System system. Typically no immediate action is required.

Other BMS Codes

BMS_a001 BMS_a002 Tesla alert code in the Battery Management System (BMS) modu... BMS_a003 Tesla alert code in the Battery Management System (BMS) modu... BMS_a004 Tesla alert code in the Battery Management System (BMS) modu... BMS_a007 Tesla alert code in the Battery Management System (BMS) modu... BMS_a016 Tesla alert code in the Battery Management System (BMS) modu... BMS_a017 BMS_a018
View all BMS codes →