P9C78

P9C78 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P9C78 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.The BHM is detecting more than one smart switch with the same ID number present on the vehicle. The outputs controlled by the switch and the indicator in the switch are commanded FF.

The BHM drives the 5 cab overhead clearance and ID lamps from connector B5 pin C on circuit 46. All other marker and tail lamps are driven from BHM connector B1,K on circuit 23. This circuit connects to the CHM as an input at connector J3,P.

Ford P9C78 Fault Code Meaning :

Ford P9C78 Symptoms :

Ford P9C78 Reasons :

How To Fix Ford P9C78 Trouble Code ?

Which Ford cars have the code P9C78?

  • P9C78 Ford Aerostar
  • P9C78 Ford Bronco
  • P9C78 Ford C-Max
  • P9C78 Ford C-Max Energi
  • P9C78 Ford C-Max Hybrid
  • P9C78 Ford Contour
  • P9C78 Ford Crown Victoria
  • P9C78 Ford EcoSport
  • P9C78 Ford Econoline
  • P9C78 Ford Edge
  • P9C78 Ford Escape
  • P9C78 Ford Escape Hybrid
  • P9C78 Ford Escort
  • P9C78 Ford Everest
  • P9C78 Ford Excursion
  • P9C78 Ford Expedition
  • P9C78 Ford Explorer
  • P9C78 Ford Explorer Sport Trac
  • P9C78 Ford F-150
  • P9C78 Ford F-250
  • P9C78 Ford F-350
  • P9C78 Ford Fiesta
  • P9C78 Ford Flex
  • P9C78 Ford Focus
  • P9C78 Ford Focus Electric
  • P9C78 Ford Freestar
  • P9C78 Ford Freestyle
  • P9C78 Ford Fusion
  • P9C78 Ford Fusion Energi
  • P9C78 Ford Fusion Hybrid
  • P9C78 Ford Fusion Plug-In Hybrid
  • P9C78 Ford GT
  • P9C78 Ford Mustang
  • P9C78 Ford Mustang Mach-E
  • P9C78 Ford Mystique
  • P9C78 Ford Probe
  • P9C78 Ford Ranger
  • P9C78 Ford Taurus
  • P9C78 Ford Taurus X
  • P9C78 Ford Tempo
  • P9C78 Ford Thunderbird
  • P9C78 Ford Transit
  • P9C78 Ford Transit Connect
  • P9C78 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.