ESP-A178
ESP_a178_IBSTOutputRodActInvalid
Also written as ESP_A178 / ESP A178 / ESP_a178_IBSTOutputRodActInvalid / esp_a178_ibstoutputrodactinvalid
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 ESP-A178 mean?
Tesla alert code in the Electronic Stability Program (ESP) module. Invalid Data Received FromBrake Booster iBooster : Invalid Signal Status IBST_outputRodActQF is invalid on CAN Verify that iBooster is awake and in good state. Review iBooster alerts for other indicators of failure Brake boost is degraded. HBC will be enabled Invalid Data Received From Steering Angle Sensor Module: Invalid Signal Status EPAS3P_internalSASQF is received as invalid Verify EPAS is awake, in good state, and there is traffic present on the bus. Review EPAS/DI alerts for other indicators of failure May fault VDC/TC, ABS performance degradation
Original Description
Invalid Data Received FromBrake Booster iBooster : Invalid Signal Status IBST_outputRodActQF is invalid on CAN Verify that iBooster is awake and in good state. Review iBooster alerts for other indicators of failure Brake boost is degraded. HBC will be enabled Invalid Data Received From Steering Angle Sensor Module: Invalid Signal Status EPAS3P_internalSASQF is received as invalid Verify EPAS is awake, in good state, and there is traffic present on the bus. Review EPAS/DI alerts for other indicators of failure May fault VDC/TC, ABS performance degradation
Affected Tesla Models
What You May Notice
- ESP-A178 may appear with another Tesla alert in the Electronic Stability Program (ESP) 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 Reboot the vehicle by holding both scroll wheels
- 2 Check for available OTA software updates
- 3 If alert persists after reboot, schedule a service appointment
Severity Notes
ESP-A178 is an Alert in the Electronic Stability Program system. Confirm the vehicle screen and Tesla app show no driving or charging restrictions, and schedule service if the alert returns.