Volkswagen Passat 2012–2014 — technical service bulletin
Bulletin 23U4 - Circular · NHTSA communication 10127864 · issued Jul 17, 2017
Technical service bulletin
communication type
Engine and Engine Cooling
component
2012–2014
model years
3
vehicle entries
Official summary
The Environmental Protection Agency and California Air Resources Board have determined that Volkswagen vehicles equipped with a 2.0L 4-cylinder TDI engine do not comply with applicable emissions regulations. The emissions control systems on the vehicles will not control emissions under off-cycle conditions as effectively as during the federal test procedure. The extent of the emissions increase under off-cycle conditions depends upon how the vehicles are driven.
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.