U0478

U0478 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U0478 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 supplies battery power on this circuit when the key is in the RUN or CRANK positions. Troubleshoot for a wiring fault shorting this circuit to ground or for too many optional circuits spliced into it that is causing the BHM to turn it off.

When the engine is in higher engine speed and torque condition, the differential pressure over the DPF is expected to rise according to engine speed and torque. If the differential pressure exceeds a threshold then the differential pressure sensor plausibility DTC is set.

Ford U0478 Fault Code Meaning :

Ford U0478 Symptoms :

Ford U0478 Reasons :

How To Fix Ford U0478 Trouble Code ?

Which Ford cars have the code U0478?

  • U0478 Ford Aerostar
  • U0478 Ford Bronco
  • U0478 Ford C-Max
  • U0478 Ford C-Max Energi
  • U0478 Ford C-Max Hybrid
  • U0478 Ford Contour
  • U0478 Ford Crown Victoria
  • U0478 Ford EcoSport
  • U0478 Ford Econoline
  • U0478 Ford Edge
  • U0478 Ford Escape
  • U0478 Ford Escape Hybrid
  • U0478 Ford Escort
  • U0478 Ford Everest
  • U0478 Ford Excursion
  • U0478 Ford Expedition
  • U0478 Ford Explorer
  • U0478 Ford Explorer Sport Trac
  • U0478 Ford F-150
  • U0478 Ford F-250
  • U0478 Ford F-350
  • U0478 Ford Fiesta
  • U0478 Ford Flex
  • U0478 Ford Focus
  • U0478 Ford Focus Electric
  • U0478 Ford Freestar
  • U0478 Ford Freestyle
  • U0478 Ford Fusion
  • U0478 Ford Fusion Energi
  • U0478 Ford Fusion Hybrid
  • U0478 Ford Fusion Plug-In Hybrid
  • U0478 Ford GT
  • U0478 Ford Mustang
  • U0478 Ford Mustang Mach-E
  • U0478 Ford Mystique
  • U0478 Ford Probe
  • U0478 Ford Ranger
  • U0478 Ford Taurus
  • U0478 Ford Taurus X
  • U0478 Ford Tempo
  • U0478 Ford Thunderbird
  • U0478 Ford Transit
  • U0478 Ford Transit Connect
  • U0478 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.