P3989

P3989 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P3989 Diagnosis

The PTO 1 output circuit is commanded OFF, but air pressure is detected at the pressure feedback switch. Troubleshoot for PTO 2 air solenoid fault, and for air pressure switch short circuit fault.Determine if the extra switch is not required for the vehicle or if the switch has been installed but the necessary reference parameter has not been programmed into the BHM.

This circuit connects to the CHM as an input at connector J3,P. The CHM passes the signal through to power the tail lamps and marker lamps from connector C2 pin G and also from connector C1 pins D, E, and F.

Ford P3989 Fault Code Meaning :

Ford P3989 Symptoms :

Ford P3989 Reasons :

How To Fix Ford P3989 Trouble Code ?

Which Ford cars have the code P3989?

  • P3989 Ford Aerostar
  • P3989 Ford Bronco
  • P3989 Ford C-Max
  • P3989 Ford C-Max Energi
  • P3989 Ford C-Max Hybrid
  • P3989 Ford Contour
  • P3989 Ford Crown Victoria
  • P3989 Ford EcoSport
  • P3989 Ford Econoline
  • P3989 Ford Edge
  • P3989 Ford Escape
  • P3989 Ford Escape Hybrid
  • P3989 Ford Escort
  • P3989 Ford Everest
  • P3989 Ford Excursion
  • P3989 Ford Expedition
  • P3989 Ford Explorer
  • P3989 Ford Explorer Sport Trac
  • P3989 Ford F-150
  • P3989 Ford F-250
  • P3989 Ford F-350
  • P3989 Ford Fiesta
  • P3989 Ford Flex
  • P3989 Ford Focus
  • P3989 Ford Focus Electric
  • P3989 Ford Freestar
  • P3989 Ford Freestyle
  • P3989 Ford Fusion
  • P3989 Ford Fusion Energi
  • P3989 Ford Fusion Hybrid
  • P3989 Ford Fusion Plug-In Hybrid
  • P3989 Ford GT
  • P3989 Ford Mustang
  • P3989 Ford Mustang Mach-E
  • P3989 Ford Mystique
  • P3989 Ford Probe
  • P3989 Ford Ranger
  • P3989 Ford Taurus
  • P3989 Ford Taurus X
  • P3989 Ford Tempo
  • P3989 Ford Thunderbird
  • P3989 Ford Transit
  • P3989 Ford Transit Connect
  • P3989 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.