Infotainment Application Crashed and Restarted
What does TESLA-UI_A011 mean?
The TESLA-UI_A011 (Tesla MCU (Media Control Unit)) EV fault code means: Infotainment Application Crashed and Restarted. This is a moderate severity code.
Common Symptoms
- Touchscreen goes black momentarily then reloads the Tesla interface from scratch
- Navigation, media, or climate controls freeze and become unresponsive before the screen restarts
- UI_a011 appears in the service menu or via Scan My Tesla alongside a crash timestamp
- Reboots happen more frequently over time, sometimes multiple times per drive
- Autopilot visualizations disappear briefly during the crash cycle
- Backup camera feed fails to appear when you shift into Reverse because the UI is mid-restart
- Some app sessions, like navigation routes or Spotify logins, are lost after each crash
Probable Causes (Ranked by Likelihood)
- Failing or worn eMMC flash storage on MCU1 hardware reaching end-of-write-cycle life Very Likely
- Corrupted OS partition or log files filling the eMMC storage to capacity, causing the UI process to crash on write Very Likely
- Thermal throttling on the MCU processor causing the UI application to time out and be killed by the watchdog Likely
- Software bug in a recently pushed over-the-air firmware update destabilizing the UI process Likely
- Loose or corroded MCU connector on the main compute board causing intermittent power or data interruption Possible
- 12V low-voltage battery sag during heavy load causing a momentary brownout to the MCU Possible
- Failed MCU hardware beyond storage, requiring full MCU replacement Less Likely
Step-by-Step Diagnostic Procedure
Start with a soft reboot: hold both scroll wheel buttons simultaneously for about 10 seconds until the Tesla logo appears. This clears transient software faults. If crashes stop, monitor for recurrence over the next week.
Check your firmware version on the touchscreen under Software. If a new OTA update is available, install it. Tesla frequently patches UI process stability issues in point releases.
Connect a Scan My Tesla app using an OBDLink MX+ or Veepeak OBD-II adapter to read the full fault log. Look for how many UI_a011 entries exist and whether the timestamps cluster around specific events like charging, cold starts, or Autopilot activation.
Identify whether your car has MCU1 or MCU2. Go to the touchscreen, tap the Tesla logo, then Software. MCU1 cars built before roughly March 2018 run the NVIDIA Tegra processor and are the primary candidates for eMMC failure. MCU2 cars are less prone to storage wear but not immune.
Inspect the 12V battery health. A weak 12V battery (below 12.4V at rest) can cause voltage sags that destabilize the MCU. Use a multimeter to measure 12V battery voltage at the terminals with the car in a low-power state. Values below 12.0V under light load suggest a failing 12V battery.
If the car has MCU1 hardware and crashes are happening more than once per week, the eMMC storage is the most likely culprit. Tesla extended the warranty on MCU1 eMMC failures to 8 years or 100,000 miles in some regions due to a known defect. Check whether your VIN qualifies before paying for repair.
Perform a full power cycle reboot by holding both scroll wheels and pressing the brake pedal at the same time, which forces a deeper reset than the scroll-wheel-only reboot. If crashes stop temporarily but return, that points to a persistent software or storage problem rather than a transient one.
If all else fails, Tesla Toolbox 3 (dealer-level access only) can read the MCU storage health metrics directly and confirm eMMC write cycle exhaustion. An independent Tesla-specialist shop with a Toolbox license can run this without a Tesla Service Center visit.
Frequently Asked Questions
What does Tesla code UI_a011 mean?
It means the main infotainment application running on the MCU crashed and the system automatically restarted it. Think of it like a forced app restart on a smartphone. A single occurrence is often harmless. Repeated crashes, especially on older Model S and Model X cars with MCU1 hardware, usually point to worn-out eMMC flash storage inside the media control unit.
Can I still drive the car with a UI_a011 code active?
Yes, you can drive, but with some caveats. While the screen is restarting you temporarily lose the backup camera, navigation, climate controls, and Autopilot visuals. Core driving functions like steering and braking are handled by separate controllers and are not affected. If crashes happen frequently while driving, that is a distraction and safety concern worth addressing promptly.
How much does it cost to fix UI_a011?
If a soft reboot or OTA update clears it, cost is zero. A failing 12V battery contributing to the issue runs $80-$300 depending on whether you DIY or use a shop. MCU1 eMMC repair at a specialist independent shop typically runs $300-$500. A full MCU upgrade from MCU1 to MCU2 through Tesla costs roughly $1,500-$2,000. Check whether your car qualifies for Tesla's extended warranty coverage on MCU1 eMMC failures before spending anything.
Will the crash affect Autopilot or safety features while driving?
Autopilot visual display will go blank during the crash cycle, and active Autopilot sessions may disengage requiring you to take over. The Autopilot hardware itself runs on a separate AP computer and is not directly crashed by UI_a011, but because the visual feedback disappears, Tesla's system typically asks for driver takeover as a safety precaution. Do not rely on Autopilot if UI crashes are happening frequently.