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Service bulletin 26 13 18 2027945

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 id10212659
Published by NHTSA2022-05-31
Manufacturer's number26 13 18 2027945
Manufacturer's date2013-05-22
NHTSA componentEQUIPMENT:MECHANICAL; ELECTRICAL SYSTEM:12V/24V/48V BATTERY

NHTSA's summary

Humming or metallic rattling noise from under the vehicle, heard most consistently during engine idle or slow acceleration. Initial inspection indicates that the noise is coming from the exhaust system. Relative movements in the rear mounting of the exhaust system (rear silencer).

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, Equipment and accessories, 12-volt battery

Vehicles listed
AUDI A42009, 2010, 2011, 2012, 2013, 2014
AUDI A52008, 2009, 2010, 2011, 2012, 2013, 2014
AUDI A5 CABRIOLET2010 to 2014

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
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27 14 24 20253602022-05-31. Service bulletin. Low battery charge: Diagnosis tips and TAC instructions
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37 13 09 20287152022-05-02. Service bulletin. After a mechatronics, torque converter, or complete gearbox replacement, the clutches must be adapted to the new component. This requires a gradual move of the clutch linings toward the optimal operating points in the most diverse load conditions. As a result, sporadic driving power disruptions lasting for less than a second or reduced shift comfort are possible over the first 500 miles. This is normal, and these issues will decrease over time. The issues can also occur if the adaptation values of the gearbox were deleted.
27 14 24 20253602022-05-02. Service bulletin. This TSB provides basic diagnosis steps for discharged batteries, general tips for working with batteries, and system verification steps to ensure that the vehicle is configured correctly. For additional information on known current draw issues, refer to the following TSBs: ? 2014127: 27 Battery dead or low after returning to the vehicle (2007 A6, A8, Q7) ? 2019143: 27 Battery discharged on some vehicles with Advanced Key (2005 - 2008 A6, Q7)
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A571738 2017082-2018-02-05. Service bulletin. This informational bulletin contains instructions for sychronizing the remote key after the battery has been disconnected or replaced.