P3C21

P3C21 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P3C21 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.Determine if the extra switch is not required for the vehicle or if the switch has been installed but the necessary reference parameter has not been programmed into the BHM.

This circuit connects to the CHM as an input at connector J3,P. The CHM passes the signal through to power the tail lamps and marker lamps from connector C2 pin G and also from connector C1 pins D, E, and F.

Ford P3C21 Fault Code Meaning :

Ford P3C21 Symptoms :

Ford P3C21 Reasons :

How To Fix Ford P3C21 Trouble Code ?

Which Ford cars have the code P3C21?

  • P3C21 Ford Aerostar
  • P3C21 Ford Bronco
  • P3C21 Ford C-Max
  • P3C21 Ford C-Max Energi
  • P3C21 Ford C-Max Hybrid
  • P3C21 Ford Contour
  • P3C21 Ford Crown Victoria
  • P3C21 Ford EcoSport
  • P3C21 Ford Econoline
  • P3C21 Ford Edge
  • P3C21 Ford Escape
  • P3C21 Ford Escape Hybrid
  • P3C21 Ford Escort
  • P3C21 Ford Everest
  • P3C21 Ford Excursion
  • P3C21 Ford Expedition
  • P3C21 Ford Explorer
  • P3C21 Ford Explorer Sport Trac
  • P3C21 Ford F-150
  • P3C21 Ford F-250
  • P3C21 Ford F-350
  • P3C21 Ford Fiesta
  • P3C21 Ford Flex
  • P3C21 Ford Focus
  • P3C21 Ford Focus Electric
  • P3C21 Ford Freestar
  • P3C21 Ford Freestyle
  • P3C21 Ford Fusion
  • P3C21 Ford Fusion Energi
  • P3C21 Ford Fusion Hybrid
  • P3C21 Ford Fusion Plug-In Hybrid
  • P3C21 Ford GT
  • P3C21 Ford Mustang
  • P3C21 Ford Mustang Mach-E
  • P3C21 Ford Mystique
  • P3C21 Ford Probe
  • P3C21 Ford Ranger
  • P3C21 Ford Taurus
  • P3C21 Ford Taurus X
  • P3C21 Ford Tempo
  • P3C21 Ford Thunderbird
  • P3C21 Ford Transit
  • P3C21 Ford Transit Connect
  • P3C21 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.