IBST-A090
IBST_a090_rotorCosOutOfRangeHigh
Also written as IBST_A090 / IBST A090 / IBST_a090_rotorCosOutOfRangeHigh / ibst_a090_rotorcosoutofrangehigh
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 IBST-A090 mean?
Tesla alert code in the Integrated Brake System (IBST) module. Rotation Position Sensor Cos+ or Cos-signal too high ASW configuration takes too long Linear Position Sensor Channel 1 Line shorted to Supply or Interruption of Sensor ground Assertion failed. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. Linear Position Sensor Channel 2 Line shorted to ground
Original Description
Rotation Position Sensor Cos+ or Cos-signal too high ASW configuration takes too long Linear Position Sensor Channel 1 Line shorted to Supply or Interruption of Sensor ground Assertion failed. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. Linear Position Sensor Channel 2 Line shorted to ground
Affected Tesla Models
What You May Notice
- Integrated Brake System alert: Rotation Position Sensor Cos+ or Cos-signal too high ASW configuration takes too long Linear Position Sensor Channel 1 L
- No noticeable change in braking performance under normal driving
How to Diagnose and Resolve
- 1 Reboot the vehicle
- 2 Monitor over the next few drives
- 3 Schedule service if the alert reappears
Severity Notes
IBST-A090 is an Alert in the Integrated Brake System system. Confirm the vehicle screen and Tesla app show no driving or charging restrictions, and schedule service if the alert returns.