P78A9

P78A9 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P78A9 Diagnosis

The fault remains active until the ignition is turned ON when the fault is no longer present. Some BHM configurations force this circuit off until the ignition switch is cycled.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 P78A9 Fault Code Meaning :

Ford P78A9 Symptoms :

Ford P78A9 Reasons :

How To Fix Ford P78A9 Trouble Code ?

Which Ford cars have the code P78A9?

  • P78A9 Ford Aerostar
  • P78A9 Ford Bronco
  • P78A9 Ford C-Max
  • P78A9 Ford C-Max Energi
  • P78A9 Ford C-Max Hybrid
  • P78A9 Ford Contour
  • P78A9 Ford Crown Victoria
  • P78A9 Ford EcoSport
  • P78A9 Ford Econoline
  • P78A9 Ford Edge
  • P78A9 Ford Escape
  • P78A9 Ford Escape Hybrid
  • P78A9 Ford Escort
  • P78A9 Ford Everest
  • P78A9 Ford Excursion
  • P78A9 Ford Expedition
  • P78A9 Ford Explorer
  • P78A9 Ford Explorer Sport Trac
  • P78A9 Ford F-150
  • P78A9 Ford F-250
  • P78A9 Ford F-350
  • P78A9 Ford Fiesta
  • P78A9 Ford Flex
  • P78A9 Ford Focus
  • P78A9 Ford Focus Electric
  • P78A9 Ford Freestar
  • P78A9 Ford Freestyle
  • P78A9 Ford Fusion
  • P78A9 Ford Fusion Energi
  • P78A9 Ford Fusion Hybrid
  • P78A9 Ford Fusion Plug-In Hybrid
  • P78A9 Ford GT
  • P78A9 Ford Mustang
  • P78A9 Ford Mustang Mach-E
  • P78A9 Ford Mystique
  • P78A9 Ford Probe
  • P78A9 Ford Ranger
  • P78A9 Ford Taurus
  • P78A9 Ford Taurus X
  • P78A9 Ford Tempo
  • P78A9 Ford Thunderbird
  • P78A9 Ford Transit
  • P78A9 Ford Transit Connect
  • P78A9 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.