Hyundai Santa FE 2018–2019 — technical service bulletin
Bulletin 21-BE-008H · NHTSA communication 10196580 · issued May 5, 2021
Technical service bulletin
communication type
Electrical System
component
2018–2019
model years
4
vehicle entries
Official summary
Certain vehicles may experience 504 Time Out errors when using the Blue Link Mobile App. When asked to provide Modem Information (IMEI/USIM), the Head Unit (HU) displays all zeros. This bulletin describes the procedure to update the Head Unit Software to correct this condition.
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.