Ford F-150 2017–2020 — technical service bulletin
Bulletin 21B10-S1 · NHTSA communication 10191519 · issued Apr 9, 2021
Technical service bulletin
communication type
Power Train
component
2017–2020
model years
4
vehicle entries
Official summary
Certain 2017-2020 Model Year F-150 Equipped with a 3.5L GTDI Engine Powertrain Control Module Reprogram for Cam Phaser Rattle Reports of Transmission Shudder after PCM Reprogram: Dealers are instructed to stop performing this field service action until further notice. This shudder is under investigation.
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.