MyTeslaMate
IBST family

IBST_a059_NvMEepromSize

Power braking assist reduced

What does the IBST_a059_NvMEepromSize alert mean?

iBooster (IBST) detected a failure word where Electrically Erasable Programmable Read-Only Memory (EEPROM) size detection failed or EEPROM size does not match configured size and actual size mounted on layout.

What you'll see in your Tesla

  • Power braking assist reduced
  • Braking may require increased effort

What triggers it

IBST detects a failure word where EEPROM size detection failed or EEPROM size does not match configured size and actual size mounted on layout.

When it clears

iBooster can not recover from this condition. iBooster replacement may be required.

Potential impact

IBST may not operate as expected.

Affected models

Cybertruck Model 3 2017-2023 Model 3 2024+ Model S 2021+ Model X 2021+ Model Y Model Y 2025+

Track your Tesla's alerts automatically

Alerts like this reach MyTeslaMate through your car's Tesla telemetry API. MyTeslaMate logs every alert your Tesla reports and turns it into readable history and real-time notifications — hosted TeslaMate with no server to run.