Service bulletins for the 2018 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.
240 on file from NHTSA, as of 2026-10-19.
About P0456 on the 2018 Hyundai Sonata: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: P0456 are shown. Show all
| 20-FL-003H | 2020-06-06. Service bulletin. ENGINE AND ENGINE COOLING. Certain 2016-2019 Sonata Hybrid (LF HEV) vehicles may experience check engine light illumination with DTC P0456 - Evaporative System (EVAP) - Very Small Leak stored. Salt particulate deposit can form inside the Natural Vacuum Leak Detection (NVLD) sensor which may cause intermittent operation prompting the DTC P0456 and check engine light. This bulletin provides the procedure to replace the NVLD sensor with an updated Air Filter Kit to help prevent entry of the salt particulates. |
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| 20-01-020H | 2020-06-06. Service bulletin. ENGINE AND ENGINE COOLING. Certain 2016-2019 Sonata Hybrid (LF HEV) may experience check engine light illumination with DTC P0456 - Evaporative System (EVAP) - Very Small Leak stored. These conditions primarily occur in the California coastal areas that are subject to marine layer cloud cover. Salt particulate deposit can form inside the Natural Vacuum Leak Detection (NVLD) sensor which may cause intermittent operation prompting the DTC P0456 and check engine light. This bulletin provides the procedure to install a new Air Filter Kit with an updated filter to help prevent entry of the salt particulates. In addition, replace NVLD sensor if DTC P0456 found stored in the Engine Control Module (ECM). |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.