What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer communications
2Original wording in English
FORD
Reported code forms P1839
Some 2017-2019 F-Super Duty 4x4 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…
FORD
Reported code forms P1839
SOME 2017 F-SUPER DUTY VEHICLES EQUIPPED WITH ELECTRONIC SHIFT ON THE FLY (ESOF) FOUR WHEEL DRIVE MAY EXHIBIT A 4X4 INDICATOR ILLUMINATED WITH DTC P1839 IN THE TCCM. THIS MAY BE CAUSED BY A BACKED OUT OR LOOSE PIN FOR…
Check vehicle applicability
3A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.