BMW 428I 2014–2016 — technical service bulletin
Bulletin B540217 · NHTSA communication 10146643 · issued Apr 1, 2017
Technical service bulletin
communication type
Electrical System
component
2014–2016
model years
8
vehicle entries
Official summary
SERVICE ACTION: IMPLAUSIBLE SENSOR SIGNALS IN CONVERTIBLE ROOF SYSTEM. Signals from sensors in luggage compartment are being misinterpreted by the convertible top control module (CVM). This may lead to failure of the system to detect obstructions and cause damage to the hydraulics. Software error in the CVM.
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.