P0391

P0391 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P0391 Diagnosis

This fault indicates that the circuit is drawing more current than it is designed to supply, and possibly there is a wiring fault shorting this circuit to ground. The fault remains active until the ignition is turned ON when the fault is no longer present.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 OFF.

The disconnected pipe malfunction is detected when the ventilator tube from the valve cover to the separator device is disconnected resulting in a pressure below the lower limit.Both of these malfunctions will result in a DTC being set.

Ford P0391 Fault Code Meaning :

Ford P0391 Symptoms :

Ford P0391 Reasons :

How To Fix Ford P0391 Trouble Code ?

Which Ford cars have the code P0391?

  • P0391 Ford Aerostar
  • P0391 Ford Bronco
  • P0391 Ford C-Max
  • P0391 Ford C-Max Energi
  • P0391 Ford C-Max Hybrid
  • P0391 Ford Contour
  • P0391 Ford Crown Victoria
  • P0391 Ford EcoSport
  • P0391 Ford Econoline
  • P0391 Ford Edge
  • P0391 Ford Escape
  • P0391 Ford Escape Hybrid
  • P0391 Ford Escort
  • P0391 Ford Everest
  • P0391 Ford Excursion
  • P0391 Ford Expedition
  • P0391 Ford Explorer
  • P0391 Ford Explorer Sport Trac
  • P0391 Ford F-150
  • P0391 Ford F-250
  • P0391 Ford F-350
  • P0391 Ford Fiesta
  • P0391 Ford Flex
  • P0391 Ford Focus
  • P0391 Ford Focus Electric
  • P0391 Ford Freestar
  • P0391 Ford Freestyle
  • P0391 Ford Fusion
  • P0391 Ford Fusion Energi
  • P0391 Ford Fusion Hybrid
  • P0391 Ford Fusion Plug-In Hybrid
  • P0391 Ford GT
  • P0391 Ford Mustang
  • P0391 Ford Mustang Mach-E
  • P0391 Ford Mystique
  • P0391 Ford Probe
  • P0391 Ford Ranger
  • P0391 Ford Taurus
  • P0391 Ford Taurus X
  • P0391 Ford Tempo
  • P0391 Ford Thunderbird
  • P0391 Ford Transit
  • P0391 Ford Transit Connect
  • P0391 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.