TSB B120721 — BMW Service bulletin
B120721 is a service bulletin on file with NHTSA for the BMW X5, 2019–2021 model years, filed and re-filed as 2 documents. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. Check Control message (CCM) indicates: (ID 213): Stop, exercising due care. Voltage supply The Service Engine Soon light is on with the following DME Fault Code: 21B209 - Starter alternator / belt for 48V system (OSA_RIEMEN_RISS): Belt betweenCombustion engine and starter…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years B120721 names
Every document filed under B120721
Manufacturers re-issue a bulletin as the repair changes, and file separate copies for technicians and for owners. All of them carry the same number.
| Document ID | Filed | Type |
|---|---|---|
| B120721 | March 4, 2024 | Service bulletin |
| B120721 | November 9, 2023 | Service bulletin |
What B120721 covers
Engine — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB B120721?
B120721 is a service bulletin filed with NHTSA by BMW, covering the BMW X5 across the 2019–2021 model years. NHTSA's summary reads: Check Control message (CCM) indicates: (ID 213): Stop, exercising due care. Voltage supply The Service Engine Soon light is on with the following DME Fault Code: 21B209 - Starter alternator / belt for 48V system (OSA_RIEMEN_RISS): Belt betweenCombustion engine and starter…
Which vehicles does B120721 cover?
NHTSA's file names BMW X5 (2019–2021). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB B120721 a recall, and is the repair free?
No. B120721 is repair guidance the manufacturer sent its dealers, not a safety defect finding. You pay for the work unless the vehicle is still under warranty. Recall repairs, by contrast, are always free.
How do I get the full text of B120721?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under B120721, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under B120721. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.