P439D

P439D Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P439D 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 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 P439D Fault Code Meaning :

Ford P439D Symptoms :

Ford P439D Reasons :

How To Fix Ford P439D Trouble Code ?

Which Ford cars have the code P439D?

  • P439D Ford Aerostar
  • P439D Ford Bronco
  • P439D Ford C-Max
  • P439D Ford C-Max Energi
  • P439D Ford C-Max Hybrid
  • P439D Ford Contour
  • P439D Ford Crown Victoria
  • P439D Ford EcoSport
  • P439D Ford Econoline
  • P439D Ford Edge
  • P439D Ford Escape
  • P439D Ford Escape Hybrid
  • P439D Ford Escort
  • P439D Ford Everest
  • P439D Ford Excursion
  • P439D Ford Expedition
  • P439D Ford Explorer
  • P439D Ford Explorer Sport Trac
  • P439D Ford F-150
  • P439D Ford F-250
  • P439D Ford F-350
  • P439D Ford Fiesta
  • P439D Ford Flex
  • P439D Ford Focus
  • P439D Ford Focus Electric
  • P439D Ford Freestar
  • P439D Ford Freestyle
  • P439D Ford Fusion
  • P439D Ford Fusion Energi
  • P439D Ford Fusion Hybrid
  • P439D Ford Fusion Plug-In Hybrid
  • P439D Ford GT
  • P439D Ford Mustang
  • P439D Ford Mustang Mach-E
  • P439D Ford Mystique
  • P439D Ford Probe
  • P439D Ford Ranger
  • P439D Ford Taurus
  • P439D Ford Taurus X
  • P439D Ford Tempo
  • P439D Ford Thunderbird
  • P439D Ford Transit
  • P439D Ford Transit Connect
  • P439D 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.