C3940

C3940 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

C3940 Diagnosis

The fuse in the main PDM powering this circuit may be open. The root cause could be excessive loads on an output, or a short to ground in the VBAT2 supply to the CHM.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 top-of-clutch switch and bottom-of-clutch switch are both measured as closed at the same time. Troubleshoot for clutch switch shorted, or for a wiring fault between the clutch switch and the BHM.

Ford C3940 Fault Code Meaning :

Ford C3940 Symptoms :

Ford C3940 Reasons :

How To Fix Ford C3940 Trouble Code ?

Which Ford cars have the code C3940?

  • C3940 Ford Aerostar
  • C3940 Ford Bronco
  • C3940 Ford C-Max
  • C3940 Ford C-Max Energi
  • C3940 Ford C-Max Hybrid
  • C3940 Ford Contour
  • C3940 Ford Crown Victoria
  • C3940 Ford EcoSport
  • C3940 Ford Econoline
  • C3940 Ford Edge
  • C3940 Ford Escape
  • C3940 Ford Escape Hybrid
  • C3940 Ford Escort
  • C3940 Ford Everest
  • C3940 Ford Excursion
  • C3940 Ford Expedition
  • C3940 Ford Explorer
  • C3940 Ford Explorer Sport Trac
  • C3940 Ford F-150
  • C3940 Ford F-250
  • C3940 Ford F-350
  • C3940 Ford Fiesta
  • C3940 Ford Flex
  • C3940 Ford Focus
  • C3940 Ford Focus Electric
  • C3940 Ford Freestar
  • C3940 Ford Freestyle
  • C3940 Ford Fusion
  • C3940 Ford Fusion Energi
  • C3940 Ford Fusion Hybrid
  • C3940 Ford Fusion Plug-In Hybrid
  • C3940 Ford GT
  • C3940 Ford Mustang
  • C3940 Ford Mustang Mach-E
  • C3940 Ford Mystique
  • C3940 Ford Probe
  • C3940 Ford Ranger
  • C3940 Ford Taurus
  • C3940 Ford Taurus X
  • C3940 Ford Tempo
  • C3940 Ford Thunderbird
  • C3940 Ford Transit
  • C3940 Ford Transit Connect
  • C3940 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.