Volkswagen Jetta 2020–2021 — technical service bulletin
Bulletin V0122032066602_4 · NHTSA communication 11018930 · issued May 2, 2025
Technical service bulletin
communication type
Engine
component
2020–2021
model years
2
vehicle entries
Official summary
Engine/Motor Control Module J623 Update Programing for low or no heat in cold weather
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.