U3999

U3999 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U3999 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 U3999 Fault Code Meaning :

Ford U3999 Symptoms :

Ford U3999 Reasons :

How To Fix Ford U3999 Trouble Code ?

Which Ford cars have the code U3999?

  • U3999 Ford Aerostar
  • U3999 Ford Bronco
  • U3999 Ford C-Max
  • U3999 Ford C-Max Energi
  • U3999 Ford C-Max Hybrid
  • U3999 Ford Contour
  • U3999 Ford Crown Victoria
  • U3999 Ford EcoSport
  • U3999 Ford Econoline
  • U3999 Ford Edge
  • U3999 Ford Escape
  • U3999 Ford Escape Hybrid
  • U3999 Ford Escort
  • U3999 Ford Everest
  • U3999 Ford Excursion
  • U3999 Ford Expedition
  • U3999 Ford Explorer
  • U3999 Ford Explorer Sport Trac
  • U3999 Ford F-150
  • U3999 Ford F-250
  • U3999 Ford F-350
  • U3999 Ford Fiesta
  • U3999 Ford Flex
  • U3999 Ford Focus
  • U3999 Ford Focus Electric
  • U3999 Ford Freestar
  • U3999 Ford Freestyle
  • U3999 Ford Fusion
  • U3999 Ford Fusion Energi
  • U3999 Ford Fusion Hybrid
  • U3999 Ford Fusion Plug-In Hybrid
  • U3999 Ford GT
  • U3999 Ford Mustang
  • U3999 Ford Mustang Mach-E
  • U3999 Ford Mystique
  • U3999 Ford Probe
  • U3999 Ford Ranger
  • U3999 Ford Taurus
  • U3999 Ford Taurus X
  • U3999 Ford Tempo
  • U3999 Ford Thunderbird
  • U3999 Ford Transit
  • U3999 Ford Transit Connect
  • U3999 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.