Hyundai Elantra 2017–2019 — technical service bulletin
Bulletin 21-01-064H · NHTSA communication 10204246 · issued Nov 16, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2017–2019
model years
3
vehicle entries
Official summary
This bulletin provides information related to an Electronic Control Module (ECM) software update to revise control logic for completion of OBD-II Fuel System Readiness Monitor diagnosis.
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.