P0128 on the 2018 Hyundai Tucson
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| 19-FL-004H | 2019-08-19. Service bulletin. This bulletin provides information related to the Engine Control Module (ECM) software logic update for the DTC P0128 ? ?Coolant thermostat - coolant temp below thermostat regulating temperature?. |
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1 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.