Code UI_a114 was reported by the “User interface” controller in the car. The letter “a” in the middle places it among entries of the alert type.
The application layer of the touchscreen. Most codes from here are everyday notices the car shows the driver — an open frunk, a door left ajar, a status message about some feature. They are not hardware faults.
The most common type. The car logged the event and may have shown it on the screen. The range is wide — from something trivial that clears itself to something that needs attention.
This is how the fault is named inside the car's firmware. For codes without a description it is the most precise clue there is — the name itself says what the event is about.
The text below comes from Tesla's technical documentation. We leave it in the original English so that translation cannot shift its meaning.
The data stream between the Autopilot computer and infotainment system is unhealthy.
The data stream between the Autopilot computer and infotainment system is healthy
Lane lines, and other vehicles around the car will not be shown on the display
Version file present therefore some maps exist, but not inside the expected region code directory
Version file present therefore some maps exist, but not inside the expected region code directory.
Expected region code directory exists. Note that this alert not shown in Factory for Korean cars or if map region or country code is Korea.
Incorrect maps are loaded, navigation unavailable.
User Interface has encountered an error which prevents the system from running and will reboot.
User Interface resumes standard operation.
eMMC FTL Register has been set
Periodic eMMC check or post-wake eMMC status has the FTL error set
Air pressure of at least one tire is very low, may have a puncture. Check and inflate tire(s)
info from manualUI_A013
Air pressure of at least one tire is very low, set by TPMS ecu (threshold may vary)
Tire pressure very low. Potential puncture. Reduced adhesion and control, excessive tire wear
Ecall alert. Modem reports that SIM card is not present
Modem detects no SIM card while monitoring SIM presence
Ecall may be inoperative, other services relying on SIM may be affected
Driver door open and master light switch is on position ON
Close driver door or change master light switch position to OFF/PARK/AUTO
If vehicle left with lights ON, it may cause battery drain
Copy it exactly, letter and number included. Photographing the screen is safest — codes often differ by a single digit, and mixing them up leads somewhere else entirely.
Some codes clear after a screen restart or after the car sits locked for a few hours. If the code does not come back, it was usually a one-off glitch.
A one-off entry and a code that appears after every drive are two different things. It helps a service centre enormously if you know exactly when it shows up.
With airbags, brakes, steering and high voltage there is no point waiting it out. With the other groups you can watch and see whether the code returns at all.
Error codes are only part of the picture. For cars on TesList you also see battery health pulled straight from the vehicle, plus a price calculator that works out from current listings what a given car is actually worth today.