Ford F-250 SD 2020 — technical service bulletin
Bulletin 20U12 · NHTSA communication 10175999 · issued May 18, 2020
Technical service bulletin
communication type
Engine and Engine Cooling
component
2020
model years
4
vehicle entries
Official summary
Some of the affected vehicles may have a valve seat that is below the required retention force or not fully seated into one of the cylinder heads. A valve seat that is out of position may cause the illumination of the check engine light and may lead eventually to engine damage and potentially resulting in engine failure.
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.