C3979

C3979 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

C3979 Diagnosis

The fault remains active until the ignition is turned ON when the fault is no longer present. Some BHM configurations force this circuit off until the ignition switch is cycled.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 FF.

The BHM drives the 5 cab overhead clearance and ID lamps from connector B5 pin C on circuit 46. All other marker and tail lamps are driven from BHM connector B1,K on circuit 23. This circuit connects to the CHM as an input at connector J3,P.

Ford C3979 Fault Code Meaning :

Ford C3979 Symptoms :

Ford C3979 Reasons :

How To Fix Ford C3979 Trouble Code ?

Which Ford cars have the code C3979?

  • C3979 Ford Aerostar
  • C3979 Ford Bronco
  • C3979 Ford C-Max
  • C3979 Ford C-Max Energi
  • C3979 Ford C-Max Hybrid
  • C3979 Ford Contour
  • C3979 Ford Crown Victoria
  • C3979 Ford EcoSport
  • C3979 Ford Econoline
  • C3979 Ford Edge
  • C3979 Ford Escape
  • C3979 Ford Escape Hybrid
  • C3979 Ford Escort
  • C3979 Ford Everest
  • C3979 Ford Excursion
  • C3979 Ford Expedition
  • C3979 Ford Explorer
  • C3979 Ford Explorer Sport Trac
  • C3979 Ford F-150
  • C3979 Ford F-250
  • C3979 Ford F-350
  • C3979 Ford Fiesta
  • C3979 Ford Flex
  • C3979 Ford Focus
  • C3979 Ford Focus Electric
  • C3979 Ford Freestar
  • C3979 Ford Freestyle
  • C3979 Ford Fusion
  • C3979 Ford Fusion Energi
  • C3979 Ford Fusion Hybrid
  • C3979 Ford Fusion Plug-In Hybrid
  • C3979 Ford GT
  • C3979 Ford Mustang
  • C3979 Ford Mustang Mach-E
  • C3979 Ford Mystique
  • C3979 Ford Probe
  • C3979 Ford Ranger
  • C3979 Ford Taurus
  • C3979 Ford Taurus X
  • C3979 Ford Tempo
  • C3979 Ford Thunderbird
  • C3979 Ford Transit
  • C3979 Ford Transit Connect
  • C3979 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.