U0391

U0391 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U0391 Diagnosis

The CHM does not suupport PWM type DRLs. The vehicle has a BHM mismatch with the CHM. Replace the CHM with one that is compatible with the BHM.The position information for the switch becomes Not Available. Remove the duplicate Smart Switch, then use ServiceLink to verify that the correct Smart Switches are configured for the vehicle.

A comparison of pressures from all sensors is made. The smallest difference between the three is determined and a reference pressure is calculated. The Barometric pressure sensor value is compared to the reference value and if the difference is above the threshold a DTC is reported.

Ford U0391 Fault Code Meaning :

Ford U0391 Symptoms :

Ford U0391 Reasons :

How To Fix Ford U0391 Trouble Code ?

Which Ford cars have the code U0391?

  • U0391 Ford Aerostar
  • U0391 Ford Bronco
  • U0391 Ford C-Max
  • U0391 Ford C-Max Energi
  • U0391 Ford C-Max Hybrid
  • U0391 Ford Contour
  • U0391 Ford Crown Victoria
  • U0391 Ford EcoSport
  • U0391 Ford Econoline
  • U0391 Ford Edge
  • U0391 Ford Escape
  • U0391 Ford Escape Hybrid
  • U0391 Ford Escort
  • U0391 Ford Everest
  • U0391 Ford Excursion
  • U0391 Ford Expedition
  • U0391 Ford Explorer
  • U0391 Ford Explorer Sport Trac
  • U0391 Ford F-150
  • U0391 Ford F-250
  • U0391 Ford F-350
  • U0391 Ford Fiesta
  • U0391 Ford Flex
  • U0391 Ford Focus
  • U0391 Ford Focus Electric
  • U0391 Ford Freestar
  • U0391 Ford Freestyle
  • U0391 Ford Fusion
  • U0391 Ford Fusion Energi
  • U0391 Ford Fusion Hybrid
  • U0391 Ford Fusion Plug-In Hybrid
  • U0391 Ford GT
  • U0391 Ford Mustang
  • U0391 Ford Mustang Mach-E
  • U0391 Ford Mystique
  • U0391 Ford Probe
  • U0391 Ford Ranger
  • U0391 Ford Taurus
  • U0391 Ford Taurus X
  • U0391 Ford Tempo
  • U0391 Ford Thunderbird
  • U0391 Ford Transit
  • U0391 Ford Transit Connect
  • U0391 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.