Service bulletins for the 2020 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.
124 on file from NHTSA, as of 2026-10-19.
About P0456 on the 2020 Hyundai Sonata: what the code means, and the bulletins and recalls about the same components.
By type
By component
By trouble code
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Only bulletins with trouble code: P0456 are shown. Show all
| Campaign T5A Dea | 2020-07-08. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM:SOFTWARE. This service campaign information is related to an Electronic Control Module (ECM) software update to revise the logic for DTC P030X: Cylinder “X” Misfire Detected and P0456: EVAP System Leakage Detected – Very Small Leak. This Service Campaign T5A will replace Service Campaign T4N. |
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| 20-01-027H | 2020-07-08. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT; ENGINE AND ENGINE COOLING. This bulletin provides information related to an Electronic Control Module (ECM) software update to revise the logic for DTC P030X: Cylinder “X” Misfire Detected and P0456: EVAP System Leakage Detected – Very Small Leak. |
| Campaign T4N Dea | 2020-03-06. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. This service campaign provides information related to an ECM software update to revise the logic for DTC P0456: EVAP System Leakage Detected Very Small Leak. |
| 20-01-005H(1) | 2020-03-06. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. This bulletin provides information related to an Electronic Control Module (ECM) software update to revise the logic for DTC P0456: EVAP System Leakage Detected Very Small Leak. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.