P4A21

P4A21 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P4A21 Diagnosis

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

The BHM measures the current on this circuit when the starter output is commanded ON. This fault indicates the magnetic switch or the wiring between the BHM and the magnetic switch is open circuit.

Ford P4A21 Fault Code Meaning :

Ford P4A21 Symptoms :

Ford P4A21 Reasons :

How To Fix Ford P4A21 Trouble Code ?

Which Ford cars have the code P4A21?

  • P4A21 Ford Aerostar
  • P4A21 Ford Bronco
  • P4A21 Ford C-Max
  • P4A21 Ford C-Max Energi
  • P4A21 Ford C-Max Hybrid
  • P4A21 Ford Contour
  • P4A21 Ford Crown Victoria
  • P4A21 Ford EcoSport
  • P4A21 Ford Econoline
  • P4A21 Ford Edge
  • P4A21 Ford Escape
  • P4A21 Ford Escape Hybrid
  • P4A21 Ford Escort
  • P4A21 Ford Everest
  • P4A21 Ford Excursion
  • P4A21 Ford Expedition
  • P4A21 Ford Explorer
  • P4A21 Ford Explorer Sport Trac
  • P4A21 Ford F-150
  • P4A21 Ford F-250
  • P4A21 Ford F-350
  • P4A21 Ford Fiesta
  • P4A21 Ford Flex
  • P4A21 Ford Focus
  • P4A21 Ford Focus Electric
  • P4A21 Ford Freestar
  • P4A21 Ford Freestyle
  • P4A21 Ford Fusion
  • P4A21 Ford Fusion Energi
  • P4A21 Ford Fusion Hybrid
  • P4A21 Ford Fusion Plug-In Hybrid
  • P4A21 Ford GT
  • P4A21 Ford Mustang
  • P4A21 Ford Mustang Mach-E
  • P4A21 Ford Mystique
  • P4A21 Ford Probe
  • P4A21 Ford Ranger
  • P4A21 Ford Taurus
  • P4A21 Ford Taurus X
  • P4A21 Ford Tempo
  • P4A21 Ford Thunderbird
  • P4A21 Ford Transit
  • P4A21 Ford Transit Connect
  • P4A21 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.