P21B1

P21B1 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P21B1 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 P21B1 Fault Code Meaning :

Ford P21B1 Symptoms :

Ford P21B1 Reasons :

How To Fix Ford P21B1 Trouble Code ?

Which Ford cars have the code P21B1?

  • P21B1 Ford Aerostar
  • P21B1 Ford Bronco
  • P21B1 Ford C-Max
  • P21B1 Ford C-Max Energi
  • P21B1 Ford C-Max Hybrid
  • P21B1 Ford Contour
  • P21B1 Ford Crown Victoria
  • P21B1 Ford EcoSport
  • P21B1 Ford Econoline
  • P21B1 Ford Edge
  • P21B1 Ford Escape
  • P21B1 Ford Escape Hybrid
  • P21B1 Ford Escort
  • P21B1 Ford Everest
  • P21B1 Ford Excursion
  • P21B1 Ford Expedition
  • P21B1 Ford Explorer
  • P21B1 Ford Explorer Sport Trac
  • P21B1 Ford F-150
  • P21B1 Ford F-250
  • P21B1 Ford F-350
  • P21B1 Ford Fiesta
  • P21B1 Ford Flex
  • P21B1 Ford Focus
  • P21B1 Ford Focus Electric
  • P21B1 Ford Freestar
  • P21B1 Ford Freestyle
  • P21B1 Ford Fusion
  • P21B1 Ford Fusion Energi
  • P21B1 Ford Fusion Hybrid
  • P21B1 Ford Fusion Plug-In Hybrid
  • P21B1 Ford GT
  • P21B1 Ford Mustang
  • P21B1 Ford Mustang Mach-E
  • P21B1 Ford Mystique
  • P21B1 Ford Probe
  • P21B1 Ford Ranger
  • P21B1 Ford Taurus
  • P21B1 Ford Taurus X
  • P21B1 Ford Tempo
  • P21B1 Ford Thunderbird
  • P21B1 Ford Transit
  • P21B1 Ford Transit Connect
  • P21B1 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.