U3900

U3900 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U3900 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 supplies battery power on this circuit when the key is in the RUN or CRANK positions. Troubleshoot for a wiring fault shorting this circuit to ground or for too many optional circuits spliced into it that is causing the BHM to turn it off.

The suspension proportioning output circuit is commanded OFF, but air pressure is detected at the pressure feedback switch. Troubleshoot for suspension proportioning air solenoid fault, and for air pressure switch short circuit fault.

Ford U3900 Fault Code Meaning :

Ford U3900 Symptoms :

Ford U3900 Reasons :

How To Fix Ford U3900 Trouble Code ?

Which Ford cars have the code U3900?

  • U3900 Ford Aerostar
  • U3900 Ford Bronco
  • U3900 Ford C-Max
  • U3900 Ford C-Max Energi
  • U3900 Ford C-Max Hybrid
  • U3900 Ford Contour
  • U3900 Ford Crown Victoria
  • U3900 Ford EcoSport
  • U3900 Ford Econoline
  • U3900 Ford Edge
  • U3900 Ford Escape
  • U3900 Ford Escape Hybrid
  • U3900 Ford Escort
  • U3900 Ford Everest
  • U3900 Ford Excursion
  • U3900 Ford Expedition
  • U3900 Ford Explorer
  • U3900 Ford Explorer Sport Trac
  • U3900 Ford F-150
  • U3900 Ford F-250
  • U3900 Ford F-350
  • U3900 Ford Fiesta
  • U3900 Ford Flex
  • U3900 Ford Focus
  • U3900 Ford Focus Electric
  • U3900 Ford Freestar
  • U3900 Ford Freestyle
  • U3900 Ford Fusion
  • U3900 Ford Fusion Energi
  • U3900 Ford Fusion Hybrid
  • U3900 Ford Fusion Plug-In Hybrid
  • U3900 Ford GT
  • U3900 Ford Mustang
  • U3900 Ford Mustang Mach-E
  • U3900 Ford Mystique
  • U3900 Ford Probe
  • U3900 Ford Ranger
  • U3900 Ford Taurus
  • U3900 Ford Taurus X
  • U3900 Ford Tempo
  • U3900 Ford Thunderbird
  • U3900 Ford Transit
  • U3900 Ford Transit Connect
  • U3900 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.