Ford F-150 2019–2020 — technical service bulletin
Bulletin SSM 49099 · NHTSA communication 10181869 · issued Oct 16, 2020
Technical service bulletin
communication type
Power Train
component
2019–2020
model years
2
vehicle entries
Official summary
2019-2020 F-150 vehicles equipped with four-wheel drive (4WD) have a revised transfer case control module (TCCM) strategy that will affect integrated wheel end (IWE) operation after initial start-up. The TCCM will not energize the solenoid to supply vacuum to the IWEs after the initial key cycle and a driven gear is selected. The IWEs will remain engaged for 0.8 km (0.5 mi) when the temperature is above 0 deg C (32 deg F) and 3 km (2 mi) when below 0 deg C (32 deg F). The strategy changes were implemented to improve vacuum supply management and axle warm up in cold temperatures. The engine mus
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.