P3B21

P3B21 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P3B21 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 FF.

The End of Frame air output circuit is commanded OFF, but air pressure is detected at the pressure feedback switch. Troubleshoot for an End of Frame air solenoid fault, and for an air pressure switch short circuit fault.

Ford P3B21 Fault Code Meaning :

Ford P3B21 Symptoms :

Ford P3B21 Reasons :

How To Fix Ford P3B21 Trouble Code ?

Which Ford cars have the code P3B21?

  • P3B21 Ford Aerostar
  • P3B21 Ford Bronco
  • P3B21 Ford C-Max
  • P3B21 Ford C-Max Energi
  • P3B21 Ford C-Max Hybrid
  • P3B21 Ford Contour
  • P3B21 Ford Crown Victoria
  • P3B21 Ford EcoSport
  • P3B21 Ford Econoline
  • P3B21 Ford Edge
  • P3B21 Ford Escape
  • P3B21 Ford Escape Hybrid
  • P3B21 Ford Escort
  • P3B21 Ford Everest
  • P3B21 Ford Excursion
  • P3B21 Ford Expedition
  • P3B21 Ford Explorer
  • P3B21 Ford Explorer Sport Trac
  • P3B21 Ford F-150
  • P3B21 Ford F-250
  • P3B21 Ford F-350
  • P3B21 Ford Fiesta
  • P3B21 Ford Flex
  • P3B21 Ford Focus
  • P3B21 Ford Focus Electric
  • P3B21 Ford Freestar
  • P3B21 Ford Freestyle
  • P3B21 Ford Fusion
  • P3B21 Ford Fusion Energi
  • P3B21 Ford Fusion Hybrid
  • P3B21 Ford Fusion Plug-In Hybrid
  • P3B21 Ford GT
  • P3B21 Ford Mustang
  • P3B21 Ford Mustang Mach-E
  • P3B21 Ford Mystique
  • P3B21 Ford Probe
  • P3B21 Ford Ranger
  • P3B21 Ford Taurus
  • P3B21 Ford Taurus X
  • P3B21 Ford Tempo
  • P3B21 Ford Thunderbird
  • P3B21 Ford Transit
  • P3B21 Ford Transit Connect
  • P3B21 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.