BMW 740E 2016–2019 — technical service bulletin
Bulletin B340619 · NHTSA communication 10161562 · issued May 1, 2019
Technical service bulletin
communication type
Service Brakes, Electric
component
2016–2019
model years
10
vehicle entries
Official summary
NO BRAKING FORCE ASSISTANCE AFTER ENGINE START DIAGNOSTIC TROUBLE CODE (DTC) 4808B4. When starting the vehicle with Electric Park Brake (EPB) engaged. The brake pedal is hard. The red brake warning light in the instrument cluster lights up. The braking force assistance has failed (stiff brake pedal). Check Control message appears: Drive at a moderate speed. Braking force assistance. After starting the engine again the warning light is no longer active and the braking force assistance is available again.
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.