Hyundai Sonata 2020–2023 — service campaign
Bulletin 25-01-001H TSB · NHTSA communication 11012362 · issued Jan 3, 2025
Service campaign
communication type
Fuel/propulsion System
component
2020–2023
model years
4
vehicle entries
Official summary
Certain 2021-2023MY Sonata (DN8) and 2020-2022MY Sonata (DN8A) vehicles may have DTC P0451 stored in the ECU. Follow this bulletin to inspect the check valve, fuel pump cover and fuel tank, and update the ECU. If necessary, replace the check valve and/or fuel tank based on inspection results. The ECU Upgrade contains a revised DTC P14EE00 which supersedes P0451.
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.