Ford F-250 SD 2021 — technical service bulletin
Bulletin SSM 49558 · NHTSA communication 10187939 · issued Feb 9, 2021
Technical service bulletin
communication type
Power Train
component
2021
model years
4
vehicle entries
Official summary
Some 2021 F-Super Duty vehicles, with 5,000 miles (8,000 km) or less may exhibit harsh or delayed engagement/shift concerns with or without transmission diagnostic trouble codes(DTC) in the powertrain control module (PCM) or the transmission control module (TCM). Most concerns at low mileage may be addressed with the accelerated main control break-in routine. Refer to Workshop Manual, Section 307-01 Diagnosis and Testing, DTC Chart and/or Diagnosis By Symptom to identify the clutch(s) to be cycled. This routine cycles the shift solenoids and clutch control valves to remove contamination that m
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.