Alfa Romeo Giulia 2019–2020 — technical service bulletin
Bulletin S2024000006 · NHTSA communication 10221839 · issued Aug 27, 2020
Technical service bulletin
communication type
Electrical System
component
2019–2020
model years
4
vehicle entries
Official summary
After Module Replacement A/C Systems Do Not Operate Properly. DTC B1938-64 Humidity Sensor LIN Bus ? Signal Plausibility Failure
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.