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Service bulletin Dealer Letter-Up

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10121521
Published by NHTSA2017-10-31
Manufacturer's numberDealer Letter-Up
Manufacturer's date2013-11-01
NHTSA componentELECTRICAL SYSTEM:IGNITION; ENGINE

NHTSA's summary

This communication is to inform you of upcoming Update 28G6. There are 79,232 Audi vehicles affected in the U.S. by this Update. Rough idle or reduced driving power and, in turn, an illuminated Malfunction Indicator Lamp (MIL) on the instrument cluster due to the presence of specific fault codes caused by this component. Inspect and replace ignition coils as required.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Engine, Ignition

Vehicles listed
AUDI A42010
AUDI A4 ALLROAD2013
AUDI A4 AVANT2011 to 2012
AUDI A52010, 2011, 2012, 2013
AUDI A5 CABRIOLET2010 to 2013
AUDI A62010, 2011, 2012, 2013
AUDI A72010 to 2011
AUDI A72012, 2013
AUDI Q52010, 2011, 2012, 2013

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
Update28G62024-02-12. Service bulletin. Ignition Coils
28G6UPDATE2023-10-10. Service bulletin. Ignition Coils (NVLW)
A5723082027406_52023-07-10. Service bulletin. This bulletin provides information regarding the Audi advanced key.
A9623822056019_22023-03-06. Service bulletin. This bulletin provides instructions for when the anti-theft alarm has gone off for no reason, or did not go off at all. No DTCs are stored.
Edition832023-02-06. Service bulletin. 97 no start
011451203058082022-10-31. Service bulletin. The remote key being used is transmitting incomplete immobilizer information to the vehicle, resulting in the condition.
011397203058062022-10-31. Service bulletin. The customer complains that the vehicle sporadically cannot be started. The remote key being used is transmitting incomplete immobilizer information to the vehicle; resulting in the condition.
011395203356112022-10-31. Service bulletin. Engine shakes. Some of the Bosch ignition coils installed in the affected vehicles may fail prematurely.
011394203058052022-10-31. Service bulletin. The remote key being used is transmitting incomplete immobilizer information to the vehicle; resulting in the condition.
011386203363012022-10-31. Service bulletin. Because there are a number of different misfire faults (unrelated to ignition coil operation) that could cause the MIL to illuminate, proper Guided Fault Finding (GFF) misfire diagnosis must be followed before any ignition coils are replaced.