Mercedes-Benz AMG GLC43 2023–2024 — technical service bulletin
Bulletin LI77.21-P-075807 · NHTSA communication 11007961 · issued Sep 21, 2024
Technical service bulletin
communication type
Visibility/wiper
component
2023–2024
model years
4
vehicle entries
Official summary
Complaint Sliding sunroof panel of panoramic sliding sunroof reverses (temporarily, once, multiple times) during closing process without entrapment event: a) from tilt position b) from sliding position Cause a) Sensitive parameterization of the automatic reversing function of the panoramic roof b) Under analysis Remedy a) Leave the sliding sunroof panel of the panoramic roof in the rear sliding position (fully open position) for at least 30 minutes (or overnight if necessary), then perform commissioning of the panoramic roof control unit (PSD, A98, TSSR254) b) Perform commissioning of panorami
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.