BMW X5 2019–2020 — technical service bulletin
Bulletin B170120 · NHTSA communication 10171486 · issued Jan 1, 2020
Technical service bulletin
communication type
Engine and Engine Cooling
component
2019–2020
model years
5
vehicle entries
Official summary
SERVICE ACTION: ADD SILICONE BOOSTER TO LOW TEMP COOLING SYSTEM: The coolant in the low temperature cooling system may not have sufficient coolant corrosion protection. AFFECTED VEHICLES Vehicles which require this Service Action to be completed will show it as "Open" when checked either in AIR the "Service Menu" of DCSnet (Dealer Communication System) or with ISPA NEXT.
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.