Mercedes-Benz C Class 2003–2004 — technical service bulletin
Bulletin 8270314B · NHTSA communication 10014547 · issued Mar 9, 2005
Technical service bulletin
communication type
Equipment
component
2003–2004
model years
4
vehicle entries
Official summary
High-pitched whining noise heard on telephone/vcs/tele aid calls. *tt
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.