Porsche Cayenne S 2003–2004 — technical service bulletin
Bulletin 406 · NHTSA communication 10009761 · issued Sep 3, 2004
Technical service bulletin
communication type
Electrical System
component
2003–2004
model years
4
vehicle entries
Official summary
Due to faulty software in the towbar system control unit, there is the possibility that the warning message check trailer lighting in the ic will be activated when the right direction indicator light is switched on with simultaneous braking for at least 3 seconds when towing a trailer. *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.