Service bulletins for the 2018 Hyundai Ioniq
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.
79 on file from NHTSA, as of 2026-10-19.
About P0128 on the 2018 Hyundai Ioniq: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: P0128 are shown. Show all
| 20-FL-012H | 2021-01-09. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. This bulletin provides information related to the Engine Control Module (ECM) software logic update for DTC P0128 “Coolant thermostat - Coolant temp Below thermostat regulating Temperature”. There is no drivability issue with this DTC. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.