P3978

P3978 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P3978 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 wiper switch is in the OFF position and the BHM park input from the wiper motor is not in park position. Troubleshoot for a wiper motor park switch circuit fault.

When the engine is in idle or in low engine speed and torque condition, the differential pressure over the DPF is expected to be close to zero. If the differential pressure exceeds a threshold then the differential pressure sensor plausibility DTC is set.

Ford P3978 Fault Code Meaning :

Ford P3978 Symptoms :

Ford P3978 Reasons :

How To Fix Ford P3978 Trouble Code ?

Which Ford cars have the code P3978?

  • P3978 Ford Aerostar
  • P3978 Ford Bronco
  • P3978 Ford C-Max
  • P3978 Ford C-Max Energi
  • P3978 Ford C-Max Hybrid
  • P3978 Ford Contour
  • P3978 Ford Crown Victoria
  • P3978 Ford EcoSport
  • P3978 Ford Econoline
  • P3978 Ford Edge
  • P3978 Ford Escape
  • P3978 Ford Escape Hybrid
  • P3978 Ford Escort
  • P3978 Ford Everest
  • P3978 Ford Excursion
  • P3978 Ford Expedition
  • P3978 Ford Explorer
  • P3978 Ford Explorer Sport Trac
  • P3978 Ford F-150
  • P3978 Ford F-250
  • P3978 Ford F-350
  • P3978 Ford Fiesta
  • P3978 Ford Flex
  • P3978 Ford Focus
  • P3978 Ford Focus Electric
  • P3978 Ford Freestar
  • P3978 Ford Freestyle
  • P3978 Ford Fusion
  • P3978 Ford Fusion Energi
  • P3978 Ford Fusion Hybrid
  • P3978 Ford Fusion Plug-In Hybrid
  • P3978 Ford GT
  • P3978 Ford Mustang
  • P3978 Ford Mustang Mach-E
  • P3978 Ford Mystique
  • P3978 Ford Probe
  • P3978 Ford Ranger
  • P3978 Ford Taurus
  • P3978 Ford Taurus X
  • P3978 Ford Tempo
  • P3978 Ford Thunderbird
  • P3978 Ford Transit
  • P3978 Ford Transit Connect
  • P3978 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.