Audi A6 2012–2014 — technical service bulletin
Bulletin A421630 2029953- · NHTSA communication 10118309 · issued Jan 27, 2016
Technical service bulletin
communication type
Suspension
component
2012–2014
model years
6
vehicle entries
Official summary
Cracking or clicking noises are heard from the rear of the vehicle in the C pillar area when it is driven over bumps or rough roads. The noise comes from the upper shock absorber mounting. Optimized damper mounting gradually introduced in production.
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.