Ford Expedition 2017–2020 — technical service bulletin
Bulletin 21B10-S3 · NHTSA communication 10201643 · issued Sep 13, 2021
Technical service bulletin
communication type
Electrical System
component
2017–2020
model years
10
vehicle entries
Official summary
Certain 2017-2020 Model Year F-150, 2018-2020 Expedition, and 2018-2020 Navigator Vehicles Equipped with a 3.5L GTDI Engine Powertrain Control Module Reprogram for Cam Phaser Rattle
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.