Hyundai Sonata 2020 — technical service bulletin
Bulletin 20-01-027H · NHTSA communication 10177133 · issued Jun 22, 2020
Technical service bulletin
communication type
Equipment
component
2020
model years
1
vehicle entries
Official summary
This bulletin provides information related to an Electronic Control Module (ECM) software update to revise the logic for DTC P030X: Cylinder â Xâ Misfire Detected and P0456: EVAP System Leakage Detected â Very Small Leak.
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.