Service bulletins for the 2021 Hyundai Sonata
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
109 on file from NHTSA, as of 2026-10-19.
About P0401 on the 2021 Hyundai Sonata: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: P0401 are shown. Show all
| 23-EE-009H | 2023-09-06. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin provides warranty procedure for EGR Valve replacement related to DTC P0401 EGR Flow Insufficient on 2020 and 2021MY Sonata (DN8a) equipped with 2.5 GDI Vehicles. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.