NHTSA ID Number: 10168771 Manufacturer Communication Number: SSM 48300 Summary Some 2017-2019 F-Super Duty 4×4 vehicles may exhibit an inoperative transfer case function with various diagnostic trouble codes (DTCs), including but not limited to P1839, P1867, P1861, P1891, P1841, U0102. If normal diagnosis leads to shift motor as the cause, first disconnect transfer case control module (TCCM) ... Read more

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