P3121

P3121 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P3121 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 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 P3121 Fault Code Meaning :

Ford P3121 Symptoms :

Ford P3121 Reasons :

How To Fix Ford P3121 Trouble Code ?

Which Ford cars have the code P3121?

  • P3121 Ford Aerostar
  • P3121 Ford Bronco
  • P3121 Ford C-Max
  • P3121 Ford C-Max Energi
  • P3121 Ford C-Max Hybrid
  • P3121 Ford Contour
  • P3121 Ford Crown Victoria
  • P3121 Ford EcoSport
  • P3121 Ford Econoline
  • P3121 Ford Edge
  • P3121 Ford Escape
  • P3121 Ford Escape Hybrid
  • P3121 Ford Escort
  • P3121 Ford Everest
  • P3121 Ford Excursion
  • P3121 Ford Expedition
  • P3121 Ford Explorer
  • P3121 Ford Explorer Sport Trac
  • P3121 Ford F-150
  • P3121 Ford F-250
  • P3121 Ford F-350
  • P3121 Ford Fiesta
  • P3121 Ford Flex
  • P3121 Ford Focus
  • P3121 Ford Focus Electric
  • P3121 Ford Freestar
  • P3121 Ford Freestyle
  • P3121 Ford Fusion
  • P3121 Ford Fusion Energi
  • P3121 Ford Fusion Hybrid
  • P3121 Ford Fusion Plug-In Hybrid
  • P3121 Ford GT
  • P3121 Ford Mustang
  • P3121 Ford Mustang Mach-E
  • P3121 Ford Mystique
  • P3121 Ford Probe
  • P3121 Ford Ranger
  • P3121 Ford Taurus
  • P3121 Ford Taurus X
  • P3121 Ford Tempo
  • P3121 Ford Thunderbird
  • P3121 Ford Transit
  • P3121 Ford Transit Connect
  • P3121 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.