P78C9

P78C9 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P78C9 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 P78C9 Fault Code Meaning :

Ford P78C9 Symptoms :

Ford P78C9 Reasons :

How To Fix Ford P78C9 Trouble Code ?

Which Ford cars have the code P78C9?

  • P78C9 Ford Aerostar
  • P78C9 Ford Bronco
  • P78C9 Ford C-Max
  • P78C9 Ford C-Max Energi
  • P78C9 Ford C-Max Hybrid
  • P78C9 Ford Contour
  • P78C9 Ford Crown Victoria
  • P78C9 Ford EcoSport
  • P78C9 Ford Econoline
  • P78C9 Ford Edge
  • P78C9 Ford Escape
  • P78C9 Ford Escape Hybrid
  • P78C9 Ford Escort
  • P78C9 Ford Everest
  • P78C9 Ford Excursion
  • P78C9 Ford Expedition
  • P78C9 Ford Explorer
  • P78C9 Ford Explorer Sport Trac
  • P78C9 Ford F-150
  • P78C9 Ford F-250
  • P78C9 Ford F-350
  • P78C9 Ford Fiesta
  • P78C9 Ford Flex
  • P78C9 Ford Focus
  • P78C9 Ford Focus Electric
  • P78C9 Ford Freestar
  • P78C9 Ford Freestyle
  • P78C9 Ford Fusion
  • P78C9 Ford Fusion Energi
  • P78C9 Ford Fusion Hybrid
  • P78C9 Ford Fusion Plug-In Hybrid
  • P78C9 Ford GT
  • P78C9 Ford Mustang
  • P78C9 Ford Mustang Mach-E
  • P78C9 Ford Mystique
  • P78C9 Ford Probe
  • P78C9 Ford Ranger
  • P78C9 Ford Taurus
  • P78C9 Ford Taurus X
  • P78C9 Ford Tempo
  • P78C9 Ford Thunderbird
  • P78C9 Ford Transit
  • P78C9 Ford Transit Connect
  • P78C9 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.