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Please give us more information... your vehicle year, make, model, where the error showed up (navigation, dash panel, PCM, your personal laptop, etc), maybe what you were doing, any vehicle running/starting issues associated with it, etc.
2014 F350 SuperDuty, crewcab pick up 6.7L DIR OHV 32V diesel
When I put it into 4wd Hi yellow warning light came on
At the car lot I asked what the code was. He read me the code C1010:13-0A
VIN#: 1FT8W3BT6EEA07250
ODB2 codes are supposed to be standardized. A cursory search online says ODB2 code C1010 should be Chassis: Battery voltage low but that's for Mercedes. The code C1010 doesn's show up on searches for Ford. Maybe it's not a valid code and he'd misleading you? Even the format with 13-oA doesn't sound right.
Well the picture has your answer... Continuous vacuum hublock. There is a vacuum leak preventing the auto-lock of the front hubs. You can lock them manually until you can fix the issue.
The minor repair would be replacing/reconnecting a vacuum hose. A major repair could be anything from rebuilding the hubs and replacing some seals to replacing the vacuum source (whatever part that may be). You really don't know until you diagnose the issue.
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