Ford Expedition 2017–2020 — technical service bulletin
Bulletin 21N03-S1 · NHTSA communication 10199482 · issued Jul 15, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2017–2020
model years
10
vehicle entries
Official summary
In some of the affected vehicles, an undesirable noise may develop from the cam phasers in the 3.5L GTDI engine. This noise might occur as a rattle when starting the engine after the vehicle was turned off for an extended period of time or as a knocking noise when the engine is idling after it is warmed up. These concerns should be addressed by the updated calibration provided in FSA 21B10. However, for peace of mind, Ford is providing an extended warranty for customers who receive the PCM update under program 21B10 prior to December 31, 2021 and continue to experience cam phaser noise after r
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.