IBST family
IBST_a157_masterCylPressInvalid
Not Available
What does the IBST_a157_masterCylPressInvalid alert mean?
iBooster (IBST) detected an invalid value in the master cyclinder. Scl: ESPiB3_pMC1 Invalid Value.
What you'll see in your Tesla
- Not Available
What triggers it
IBST detected an invalid value in the master cyclinder. Scl: ESPiB3_pMC1 Invalid Value.
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+
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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.