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RecallGazette

Vehicle problems, recalls & safety intelligence

Mercedes-Benz AMG GLC43 2020–2026technical service bulletin

Bulletin LI77.21-P-080503 · NHTSA communication 11031867 · issued Apr 30, 2026

Technical service bulletin
communication type
Electrical System
component
2020–2026
model years
30
vehicle entries

Official summary

Complaint The panoramic sliding sunroof operates in a stepped movement. The panoramic roof becomes denormalized without an apparent reason (not directly after control unit replacement). Automatic operation of the glass panel and roller sunblind is not possible; only tip‑mode operation is available. In combination with one, serval, or all of the following Fault Codes stored in the panoramic roof control unit (PSD, A98, TSSR254): • B184954 • B184955 • B1E7554 • B1E7555 Note: Please see LI77.21-P-075807 for complaints of the sliding sunroof panel of panoramic sliding sunroof reverses (temporarily

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.