P3940

P3940 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P3940 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 wiper switch is in the OFF position and the BHM park input from the wiper motor is not in park position. Troubleshoot for a wiper motor park switch circuit fault.

When the engine is in idle or in low engine speed and torque condition, the differential pressure over the DPF is expected to be close to zero. If the differential pressure exceeds a threshold then the differential pressure sensor plausibility DTC is set.

Ford P3940 Fault Code Meaning :

Ford P3940 Symptoms :

Ford P3940 Reasons :

How To Fix Ford P3940 Trouble Code ?

Which Ford cars have the code P3940?

  • P3940 Ford Aerostar
  • P3940 Ford Bronco
  • P3940 Ford C-Max
  • P3940 Ford C-Max Energi
  • P3940 Ford C-Max Hybrid
  • P3940 Ford Contour
  • P3940 Ford Crown Victoria
  • P3940 Ford EcoSport
  • P3940 Ford Econoline
  • P3940 Ford Edge
  • P3940 Ford Escape
  • P3940 Ford Escape Hybrid
  • P3940 Ford Escort
  • P3940 Ford Everest
  • P3940 Ford Excursion
  • P3940 Ford Expedition
  • P3940 Ford Explorer
  • P3940 Ford Explorer Sport Trac
  • P3940 Ford F-150
  • P3940 Ford F-250
  • P3940 Ford F-350
  • P3940 Ford Fiesta
  • P3940 Ford Flex
  • P3940 Ford Focus
  • P3940 Ford Focus Electric
  • P3940 Ford Freestar
  • P3940 Ford Freestyle
  • P3940 Ford Fusion
  • P3940 Ford Fusion Energi
  • P3940 Ford Fusion Hybrid
  • P3940 Ford Fusion Plug-In Hybrid
  • P3940 Ford GT
  • P3940 Ford Mustang
  • P3940 Ford Mustang Mach-E
  • P3940 Ford Mystique
  • P3940 Ford Probe
  • P3940 Ford Ranger
  • P3940 Ford Taurus
  • P3940 Ford Taurus X
  • P3940 Ford Tempo
  • P3940 Ford Thunderbird
  • P3940 Ford Transit
  • P3940 Ford Transit Connect
  • P3940 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.