P78B4

P78B4 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P78B4 Diagnosis

The fuse in the main PDM powering this circuit may be open. The root cause could be excessive loads on an output, or a short to ground in the VBAT2 supply to the CHM.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 P78B4 Fault Code Meaning :

Ford P78B4 Symptoms :

Ford P78B4 Reasons :

How To Fix Ford P78B4 Trouble Code ?

Which Ford cars have the code P78B4?

  • P78B4 Ford Aerostar
  • P78B4 Ford Bronco
  • P78B4 Ford C-Max
  • P78B4 Ford C-Max Energi
  • P78B4 Ford C-Max Hybrid
  • P78B4 Ford Contour
  • P78B4 Ford Crown Victoria
  • P78B4 Ford EcoSport
  • P78B4 Ford Econoline
  • P78B4 Ford Edge
  • P78B4 Ford Escape
  • P78B4 Ford Escape Hybrid
  • P78B4 Ford Escort
  • P78B4 Ford Everest
  • P78B4 Ford Excursion
  • P78B4 Ford Expedition
  • P78B4 Ford Explorer
  • P78B4 Ford Explorer Sport Trac
  • P78B4 Ford F-150
  • P78B4 Ford F-250
  • P78B4 Ford F-350
  • P78B4 Ford Fiesta
  • P78B4 Ford Flex
  • P78B4 Ford Focus
  • P78B4 Ford Focus Electric
  • P78B4 Ford Freestar
  • P78B4 Ford Freestyle
  • P78B4 Ford Fusion
  • P78B4 Ford Fusion Energi
  • P78B4 Ford Fusion Hybrid
  • P78B4 Ford Fusion Plug-In Hybrid
  • P78B4 Ford GT
  • P78B4 Ford Mustang
  • P78B4 Ford Mustang Mach-E
  • P78B4 Ford Mystique
  • P78B4 Ford Probe
  • P78B4 Ford Ranger
  • P78B4 Ford Taurus
  • P78B4 Ford Taurus X
  • P78B4 Ford Tempo
  • P78B4 Ford Thunderbird
  • P78B4 Ford Transit
  • P78B4 Ford Transit Connect
  • P78B4 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.