Chrysler Pacifica 2016–2019 — technical service bulletin
Bulletin 9004171 · NHTSA communication 10170306 · issued Dec 4, 2019
Technical service bulletin
communication type
Engine and Engine Cooling
component
2016–2019
model years
14
vehicle entries
Official summary
COVER, Cylinder Head, Left/Right Prior to replacing the cylinder head cover on ANY 3.6L Pentastar Upgrade Engine, verify that there are no steel dowel pins pressed into the cylinder head. If dowels are present in the cylinder head please remove carefully without touching/damaging the cylinder head sealing surface.
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.