BMW 330E 2016–2017 — technical service bulletin
Bulletin B612416 · NHTSA communication 10146788 · issued Dec 1, 2016
Technical service bulletin
communication type
Electrical System
component
2016–2017
model years
6
vehicle entries
Official summary
"SME FAULT CODE 21F21F. The fault code (FC) ""21F21F - High-voltage system: Monitoring of insulation resistance deactivated due to fault of the safety box"" is stored in the battery management electronics (SME). The fault does not set any CCM's, is not perceivable to the customer and has no effect on the complete vehicle operation. Safety box malfunction"
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.