Service bulletins for the 2020 Hyundai Elantra
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.
99 on file from NHTSA, as of 2026-10-19.
About P0128 on the 2020 Hyundai Elantra: 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-007H | 2020-08-07. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM:SOFTWARE. This bulletin provides information related to an ECM (Engine Control Module) software update for DTC P0128: Coolant Thermostat (Coolant Temp below Thermostat Regulating Temperature) logic revision. There are no drivability symptoms associated with DTC P0128. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.