Hyundai Elantra GT 2018–2019 — technical service bulletin
Bulletin 20-01-036H · NHTSA communication 10181000 · issued Sep 2, 2020
Technical service bulletin
communication type
Engine and Engine Cooling
component
2018–2019
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.