U3879

U3879 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U3879 Diagnosis

The axle lift 2 output circuit is commanded OFF, but air pressure is detected at the pressure feedback switch. Troubleshoot for axle lift 2 air solenoid fault, and for air pressure switch short circuit fault.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.

When the engine is in higher engine speed and torque condition, the differential pressure over the DPF is expected to rise according to engine speed and torque. If the differential pressure exceeds a threshold then the differential pressure sensor plausibility DTC is set.

Ford U3879 Fault Code Meaning :

Ford U3879 Symptoms :

Ford U3879 Reasons :

How To Fix Ford U3879 Trouble Code ?

Which Ford cars have the code U3879?

  • U3879 Ford Aerostar
  • U3879 Ford Bronco
  • U3879 Ford C-Max
  • U3879 Ford C-Max Energi
  • U3879 Ford C-Max Hybrid
  • U3879 Ford Contour
  • U3879 Ford Crown Victoria
  • U3879 Ford EcoSport
  • U3879 Ford Econoline
  • U3879 Ford Edge
  • U3879 Ford Escape
  • U3879 Ford Escape Hybrid
  • U3879 Ford Escort
  • U3879 Ford Everest
  • U3879 Ford Excursion
  • U3879 Ford Expedition
  • U3879 Ford Explorer
  • U3879 Ford Explorer Sport Trac
  • U3879 Ford F-150
  • U3879 Ford F-250
  • U3879 Ford F-350
  • U3879 Ford Fiesta
  • U3879 Ford Flex
  • U3879 Ford Focus
  • U3879 Ford Focus Electric
  • U3879 Ford Freestar
  • U3879 Ford Freestyle
  • U3879 Ford Fusion
  • U3879 Ford Fusion Energi
  • U3879 Ford Fusion Hybrid
  • U3879 Ford Fusion Plug-In Hybrid
  • U3879 Ford GT
  • U3879 Ford Mustang
  • U3879 Ford Mustang Mach-E
  • U3879 Ford Mystique
  • U3879 Ford Probe
  • U3879 Ford Ranger
  • U3879 Ford Taurus
  • U3879 Ford Taurus X
  • U3879 Ford Tempo
  • U3879 Ford Thunderbird
  • U3879 Ford Transit
  • U3879 Ford Transit Connect
  • U3879 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.