Hyundai Elantra 2019–2020 — technical service bulletin
Bulletin 20-FL-007H · NHTSA communication 10178170 · issued Jul 13, 2020
Technical service bulletin
communication type
Equipment Adaptive/mobility
component
2019–2020
model years
2
vehicle entries
Official summary
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.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.