P3979

P3979 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P3979 Diagnosis

The output circuits that are powered by VBAT2 will all be inoperative. Other fault codes may be present, but troubleshoot for this first. 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 P3979 Fault Code Meaning :

Ford P3979 Symptoms :

Ford P3979 Reasons :

How To Fix Ford P3979 Trouble Code ?

Which Ford cars have the code P3979?

  • P3979 Ford Aerostar
  • P3979 Ford Bronco
  • P3979 Ford C-Max
  • P3979 Ford C-Max Energi
  • P3979 Ford C-Max Hybrid
  • P3979 Ford Contour
  • P3979 Ford Crown Victoria
  • P3979 Ford EcoSport
  • P3979 Ford Econoline
  • P3979 Ford Edge
  • P3979 Ford Escape
  • P3979 Ford Escape Hybrid
  • P3979 Ford Escort
  • P3979 Ford Everest
  • P3979 Ford Excursion
  • P3979 Ford Expedition
  • P3979 Ford Explorer
  • P3979 Ford Explorer Sport Trac
  • P3979 Ford F-150
  • P3979 Ford F-250
  • P3979 Ford F-350
  • P3979 Ford Fiesta
  • P3979 Ford Flex
  • P3979 Ford Focus
  • P3979 Ford Focus Electric
  • P3979 Ford Freestar
  • P3979 Ford Freestyle
  • P3979 Ford Fusion
  • P3979 Ford Fusion Energi
  • P3979 Ford Fusion Hybrid
  • P3979 Ford Fusion Plug-In Hybrid
  • P3979 Ford GT
  • P3979 Ford Mustang
  • P3979 Ford Mustang Mach-E
  • P3979 Ford Mystique
  • P3979 Ford Probe
  • P3979 Ford Ranger
  • P3979 Ford Taurus
  • P3979 Ford Taurus X
  • P3979 Ford Tempo
  • P3979 Ford Thunderbird
  • P3979 Ford Transit
  • P3979 Ford Transit Connect
  • P3979 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.