Mercedes-Benz GLB 250 2021 — technical service bulletin
Bulletin LI54.71-P-072473 · NHTSA communication 10189405 · issued Feb 19, 2021
Technical service bulletin
communication type
Air Bags
component
2021
model years
1
vehicle entries
Official summary
Complaint BR X247 only Code 233 Several messages of driver assistant system related - "Active Brake Assist temporarily not available, see manual"(Yellow) - "Active Blind Spot Assist inoperative" (Yellow) - "Active Lane Change Assist inoperative"(Yellow) Cause in analysis Remedy Please measure the angle between the rear radar sensors and the car as seen in the attached photo. Create PTSS Case with findings.
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.