Ford F-150 2018–2020 — technical service bulletin
Bulletin SSM 48573 · NHTSA communication 10171964 · issued Feb 20, 2020
Technical service bulletin
communication type
Engine and Engine Cooling
component
2018–2020
model years
3
vehicle entries
Official summary
Some 2018-2020 F-150 vehicles equipped with a 5.0L engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P0172, P0173, P0174 and/or P0175. This may be due to incorrect flex fuel learning, which is often caused by customer refueling habits or a stuck open evaporative emissions purge valve. Refer to pinpoint test H in the Powertrain Control/Emissions Diagnosis (PC/ED) Manual for diagnostics and Flex Fuel GSB for additional flex fuel system information and diagnostic tips.
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.