Volkswagen Passat 2013–2014 — technical service bulletin
Bulletin 23Z3 · NHTSA communication 10154064 · issued Dec 20, 2018
Technical service bulletin
communication type
Electrical System
component
2013–2014
model years
2
vehicle entries
Official summary
Emissions Service Action 23Z3 / Improved Post-AEM Engine Control Module Software (AEM-C)
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.