BMW X3 2020 — technical service bulletin
Bulletin B120120 · NHTSA communication 10171481 · issued Jan 1, 2020
Technical service bulletin
communication type
Engine and Engine Cooling
component
2020
model years
2
vehicle entries
Official summary
FAULTS FOR TURBOCHARGER ELECTRIC WASTEGATE STORED IN THE DME. The engine malfunction warning (MIL) is illuminated and one of the following fault codes is stored in the DME. 123518 - electrical wastegate valve 2 wastegate valve: stiff movement And/or 120408 - charging pressure control: Switch-off as a secondary reaction CAUSE The DME has an adaptation error when calculating the setpoint values of the two electric wastegates.
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.