Hyundai Sonata 2020–2023 — technical service bulletin
Bulletin 24-FL-002H · NHTSA communication 10251294 · issued Feb 29, 2024
Technical service bulletin
communication type
Engine and Engine Cooling
component
2020–2023
model years
4
vehicle entries
Official summary
This bulletin provides the procedure to update the Engine Control Module (ECM) and/or the Transmission Control Module (TCM) for 2020-2023MY Sonata (DN8/DN8a) vehicles to improve operation of the Idle Stop and Go (ISG) system. Under certain circumstances the vehicle may not restart after the ISG system has engaged and requires a manual restart due to the lack of intake manifold pressure recovery.
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.