Volkswagen Jetta 2019 — technical service bulletin
Bulletin V0121042061991_1 · NHTSA communication 10186975 · issued Feb 4, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2019
model years
1
vehicle entries
Official summary
Current Engine/Motor Control Module -J623- software can lead to various fault codes within the vehicle.
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.