Buick Enclave 2019–2023 — technical service bulletin
Bulletin PIP5674A · NHTSA communication 10227660 · issued Nov 10, 2022
Technical service bulletin
communication type
Engine and Engine Cooling
component
2019–2023
model years
13
vehicle entries
Official summary
This Preliminary information communicates a concern with porosity in the cylinder head casting causing coolant to get into the oil and steps to find and repair it.
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.