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B12ED on the 2017 Audi A6

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 B12ED
A091701 2046321-2018-02-05. Service bulletin. This repair authorization is for DTC B12ECF2 and DTC B12EDF2 when the LED control module has had water access it.
A091600 2046321_2017-02-08. Service bulletin. THIS REPAIR AUTHORIZATION IS FOR DTC B12ECF2 AND DTC B12EDF2 WHEN THE LED CONTROL MODULE HAS HAD WATER ACCESS IT.

2 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.