P78A4

P78A4 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P78A4 Diagnosis

The output circuits that are powered by VBAT3 will all be inoperative. Other fault codes may be present, but troubleshoot for this first. The fuse in the main PDM powering this circuit may be open.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 OFF.

The disconnected pipe malfunction is detected when the ventilator tube from the valve cover to the separator device is disconnected resulting in a pressure below the lower limit.Both of these malfunctions will result in a DTC being set.

Ford P78A4 Fault Code Meaning :

Ford P78A4 Symptoms :

Ford P78A4 Reasons :

How To Fix Ford P78A4 Trouble Code ?

Which Ford cars have the code P78A4?

  • P78A4 Ford Aerostar
  • P78A4 Ford Bronco
  • P78A4 Ford C-Max
  • P78A4 Ford C-Max Energi
  • P78A4 Ford C-Max Hybrid
  • P78A4 Ford Contour
  • P78A4 Ford Crown Victoria
  • P78A4 Ford EcoSport
  • P78A4 Ford Econoline
  • P78A4 Ford Edge
  • P78A4 Ford Escape
  • P78A4 Ford Escape Hybrid
  • P78A4 Ford Escort
  • P78A4 Ford Everest
  • P78A4 Ford Excursion
  • P78A4 Ford Expedition
  • P78A4 Ford Explorer
  • P78A4 Ford Explorer Sport Trac
  • P78A4 Ford F-150
  • P78A4 Ford F-250
  • P78A4 Ford F-350
  • P78A4 Ford Fiesta
  • P78A4 Ford Flex
  • P78A4 Ford Focus
  • P78A4 Ford Focus Electric
  • P78A4 Ford Freestar
  • P78A4 Ford Freestyle
  • P78A4 Ford Fusion
  • P78A4 Ford Fusion Energi
  • P78A4 Ford Fusion Hybrid
  • P78A4 Ford Fusion Plug-In Hybrid
  • P78A4 Ford GT
  • P78A4 Ford Mustang
  • P78A4 Ford Mustang Mach-E
  • P78A4 Ford Mystique
  • P78A4 Ford Probe
  • P78A4 Ford Ranger
  • P78A4 Ford Taurus
  • P78A4 Ford Taurus X
  • P78A4 Ford Tempo
  • P78A4 Ford Thunderbird
  • P78A4 Ford Transit
  • P78A4 Ford Transit Connect
  • P78A4 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.