Mercedes-Benz AMG GLC43 2023–2024 — technical service bulletin
Bulletin LI77.21-P-077779 · NHTSA communication 11000544 · issued May 4, 2024
Technical service bulletin
communication type
Visibility/wiper
component
2023–2024
model years
7
vehicle entries
Official summary
Sliding sunroof panel of panoramic sliding sunroof reversed (temporarily, once, multiple times) during closing process without entrapment event. Cause remains open. For analysis, the information from the control unit log of the panoramic roof control unit (TSSR254) is required via a TIPS case. Further analyses Requirement: • The teach-in run for the automatic reversing function of the panoramic roof via XENTRY has still NOT been carried out • SW-SNR is A254 902 9702 with parameter data set A254 903 2902 or A254 903 4802 Please perform the following steps: 1. Create a TIPS case 2. Create contro
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.