Audi A8 2013–2016 — technical service bulletin
Bulletin A171562 2040644- · NHTSA communication 10120031 · issued May 13, 2015
Technical service bulletin
communication type
Engine and Engine Cooling
component
2013–2016
model years
20
vehicle entries
Official summary
A metallic whistling or grinding sound is heard from the engine compartment when the vehicle is at idle speed. The sound usually only occurs when the engine is warm. The MIL is sporadically on. DTC P2279 and DTC P0507 are stored in the ECM. A leak in the crankcase breather module (pressure regulating valve) can cause this condition.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.