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U1A4B on the 2011 Jaguar XK

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.

Bulletins for this model year that name U1A4B
JTB00328NAS12022-11-21. Service bulletin. Touch Screen Reset With DTC U1A4B-48 Stored
JTB00328NAS12017-04-19. Service bulletin. "SITUATION: THE TOUCH SCREEN MAY RESET OR BE BLANK ON START-UP AND DIAGNOSTIC TROUBLE CODE (DTC) U1A4B-48 MAY BE STORED IN THE TOUCH SCREEN. CAUSE: THIS MAY BE CAUSED BY A SOFTWARE ISSUE WITHIN THE TOUCH SCREEN."
JTB-00328-NAS-12016-05-13. Service bulletin. "SITUATION: THE TOUCH SCREEN MAY RESET OR BE BLANK ON START-UP AND DIAGNOSTIC TROUBLE CODE (DTC) U1A4B-48 MAY BE STORED IN THE TOUCH SCREEN. CAUSE: THIS MAY BE CAUSED BY A SOFTWARE ISSUE WITHIN THE TOUCH SCREEN."

3 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.