UI-A038
UI_a038_AudioWatchdogA2bI2cLockupError
Also written as UI_A038 / UI A038 / UI_a038_AudioWatchdogA2bI2cLockupError / ui_a038_audiowatchdoga2bi2clockuperror
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 UI-A038 mean?
Tesla alert code in the User Interface (UI) module. I2C arbitration loss causing all audio devices on the I2C bus to no longer be accessible. It prevents rediscovering the microphones and premium amp and reconfiguring the base audio amplifiers. Audio Weaver will be restarted by the watchdog to recover devices and unlock I2C bus Audio A2B I2C lockup, may be caused by A2B SYNC clock stopped at a specific moment and caused I2C arbitration loss which is not correctly recovered from Audio devices on the I2C bus are no longer accessible. Phone calls may be impacted with the far end no longer hearing the person in the car. In premium cars the bass sound may disappear and the audio may sound tinny and strange. If the base audio needs to be reset for any reason then it will also fail and then we'll have complete loss of audio Driver door open when gear is D/R/N. Triggers a continuous chime Driver door open when gear is D/R/N Shift into Park or close the driver door Potential danger of open door whilst driving
Original Description
I2C arbitration loss causing all audio devices on the I2C bus to no longer be accessible. It prevents rediscovering the microphones and premium amp and reconfiguring the base audio amplifiers. Audio Weaver will be restarted by the watchdog to recover devices and unlock I2C bus Audio A2B I2C lockup, may be caused by A2B SYNC clock stopped at a specific moment and caused I2C arbitration loss which is not correctly recovered from Audio devices on the I2C bus are no longer accessible. Phone calls may be impacted with the far end no longer hearing the person in the car. In premium cars the bass sound may disappear and the audio may sound tinny and strange. If the base audio needs to be reset for any reason then it will also fail and then we'll have complete loss of audio Driver door open when gear is D/R/N. Triggers a continuous chime Driver door open when gear is D/R/N Shift into Park or close the driver door Potential danger of open door whilst driving
Affected Tesla Models
What You May Notice
- User Interface alert: I2C arbitration loss causing all audio devices on the I2C bus to no longer be accessible. It prevents rediscovering the
- Touchscreen may show an error for one or more apps or settings
- Feature may restore itself after a reboot
How to Diagnose and Resolve
- 1 Perform a soft reboot (hold both scroll wheels for ~10 seconds)
- 2 Check for pending OTA software updates
- 3 If the issue persists, schedule a service appointment
Severity Notes
UI-A038 is an Alert in the User Interface system. Confirm the vehicle screen and Tesla app show no driving or charging restrictions, and schedule service if the alert returns.