Mercedes-Benz AMG GLC43 2020–2026 — technical 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
Vehicles covered
- 2024 Mercedes-Benz AMG GLC43
- 2024 Mercedes-Benz AMG GLC43 4MATIC
- 2025 Mercedes-Benz AMG GLC43 4MATIC
- 2026 Mercedes-Benz AMG GLC43 4MATIC
- 2024 Mercedes-Benz AMG GLC43 4MATIC Coupe
- 2025 Mercedes-Benz AMG GLC43 4MATIC Coupe
- 2024 Mercedes-Benz AMG GLC63 S E
- 2025 Mercedes-Benz AMG GLC63 S E
- 2025 Mercedes-Benz AMG GLC63 S E 4MATIC+
- 2026 Mercedes-Benz AMG GLC63 S E 4MATIC+
- 2025 Mercedes-Benz AMG GLC63 S E 4MATIC+ Coupe
- 2026 Mercedes-Benz AMG GLC63 S E 4MATIC+ Coupe
- 2020 Mercedes-Benz GLC 300
- 2021 Mercedes-Benz GLC 300
- 2022 Mercedes-Benz GLC 300
- 2023 Mercedes-Benz GLC 300
- 2024 Mercedes-Benz GLC 300
- 2025 Mercedes-Benz GLC 300
- 2026 Mercedes-Benz GLC 300
- 2023 Mercedes-Benz GLC 300 4MATIC
- 2024 Mercedes-Benz GLC 300 4MATIC
- 2025 Mercedes-Benz GLC 300 4MATIC
- 2026 Mercedes-Benz GLC 300 4MATIC
- 2024 Mercedes-Benz GLC 300 4MATIC Coupe
- 2025 Mercedes-Benz GLC 300 4MATIC Coupe
- 2026 Mercedes-Benz GLC 300 4MATIC Coupe
- 2024 Mercedes-Benz GLC 300 Coupe
- 2025 Mercedes-Benz GLC 350 E 4MATIC
- 2026 Mercedes-Benz GLC 350 E 4MATIC
- 2026 Mercedes-Benz GLC43 4MATIC Coupe
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.