C0391

C0391 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

C0391 Diagnosis

The output circuits that are powered by VBAT2 will all be inoperative. Other fault codes may be present, but troubleshoot for this first. The BHM is detecting more than one smart switch with the same ID number present on the vehicle. The outputs controlled by the switch and the indicator in the switch are commanded FF.

The End of Frame air output circuit is commanded OFF, but air pressure is detected at the pressure feedback switch. Troubleshoot for an End of Frame air solenoid fault, and for an air pressure switch short circuit fault.

Ford C0391 Fault Code Meaning :

Ford C0391 Symptoms :

Ford C0391 Reasons :

How To Fix Ford C0391 Trouble Code ?

Which Ford cars have the code C0391?

  • C0391 Ford Aerostar
  • C0391 Ford Bronco
  • C0391 Ford C-Max
  • C0391 Ford C-Max Energi
  • C0391 Ford C-Max Hybrid
  • C0391 Ford Contour
  • C0391 Ford Crown Victoria
  • C0391 Ford EcoSport
  • C0391 Ford Econoline
  • C0391 Ford Edge
  • C0391 Ford Escape
  • C0391 Ford Escape Hybrid
  • C0391 Ford Escort
  • C0391 Ford Everest
  • C0391 Ford Excursion
  • C0391 Ford Expedition
  • C0391 Ford Explorer
  • C0391 Ford Explorer Sport Trac
  • C0391 Ford F-150
  • C0391 Ford F-250
  • C0391 Ford F-350
  • C0391 Ford Fiesta
  • C0391 Ford Flex
  • C0391 Ford Focus
  • C0391 Ford Focus Electric
  • C0391 Ford Freestar
  • C0391 Ford Freestyle
  • C0391 Ford Fusion
  • C0391 Ford Fusion Energi
  • C0391 Ford Fusion Hybrid
  • C0391 Ford Fusion Plug-In Hybrid
  • C0391 Ford GT
  • C0391 Ford Mustang
  • C0391 Ford Mustang Mach-E
  • C0391 Ford Mystique
  • C0391 Ford Probe
  • C0391 Ford Ranger
  • C0391 Ford Taurus
  • C0391 Ford Taurus X
  • C0391 Ford Tempo
  • C0391 Ford Thunderbird
  • C0391 Ford Transit
  • C0391 Ford Transit Connect
  • C0391 Ford Windstar

A code is a fault code and it indicates that something has gone wrong with your car's engine.

It can be caused by many different problems, including a faulty battery, a bad fuel pump, or even a cracked exhaust manifold.

You will need to diagnose the problem before you can fix it. The best way to do this is with an OBD scanner tool.

A scan tool will tell you what needs fixing and how much it will cost in order to fix that particular issue.