Hyundai Sonata 2020–2023 — service campaign
Bulletin 9B1 OL · NHTSA communication 11011830 · issued Dec 10, 2024
Service campaign
communication type
Electrical System
component
2020–2023
model years
4
vehicle entries
Official summary
The subject vehicles may have Diagnostic Trouble Code (DTC) P0451 stored in the ECU, which could cause the Check Engine Lamp to come on.
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.