BMW M5 2018–2021 — technical service bulletin
Bulletin B160420 · NHTSA communication 10184574 · issued Nov 1, 2020
Technical service bulletin
communication type
Fuel System, Gasoline
component
2018–2021
model years
15
vehicle entries
Official summary
TANK VENTILATION DIAGNOSIS: There is software error in the diagnosis of the fuel tank ventilation valve. This error may result in the Service Engine Soon (MIL) light not being activated if a fault is found in the tank vent system after a second fault detection.
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.