P4B21

P4B21 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P4B21 Diagnosis

The CHM does not suupport PWM type DRLs. The vehicle has a BHM mismatch with the CHM. Replace the CHM with one that is compatible with the BHM.The ICU reads the wiper switch position and sends the status of the switch to the BHM. This fault becomes active when the ICU reads that both LO speed and HI speed are active at the same time.

The BHM measures the current on this circuit when the headlamp output is commanded ON. This fault indicates that the left high beam headlamp circuit is drawing more current than it is designed to supply and possibly there is a wiring fault shorting this circuit to ground.

Ford P4B21 Fault Code Meaning :

Ford P4B21 Symptoms :

Ford P4B21 Reasons :

How To Fix Ford P4B21 Trouble Code ?

Which Ford cars have the code P4B21?

  • P4B21 Ford Aerostar
  • P4B21 Ford Bronco
  • P4B21 Ford C-Max
  • P4B21 Ford C-Max Energi
  • P4B21 Ford C-Max Hybrid
  • P4B21 Ford Contour
  • P4B21 Ford Crown Victoria
  • P4B21 Ford EcoSport
  • P4B21 Ford Econoline
  • P4B21 Ford Edge
  • P4B21 Ford Escape
  • P4B21 Ford Escape Hybrid
  • P4B21 Ford Escort
  • P4B21 Ford Everest
  • P4B21 Ford Excursion
  • P4B21 Ford Expedition
  • P4B21 Ford Explorer
  • P4B21 Ford Explorer Sport Trac
  • P4B21 Ford F-150
  • P4B21 Ford F-250
  • P4B21 Ford F-350
  • P4B21 Ford Fiesta
  • P4B21 Ford Flex
  • P4B21 Ford Focus
  • P4B21 Ford Focus Electric
  • P4B21 Ford Freestar
  • P4B21 Ford Freestyle
  • P4B21 Ford Fusion
  • P4B21 Ford Fusion Energi
  • P4B21 Ford Fusion Hybrid
  • P4B21 Ford Fusion Plug-In Hybrid
  • P4B21 Ford GT
  • P4B21 Ford Mustang
  • P4B21 Ford Mustang Mach-E
  • P4B21 Ford Mystique
  • P4B21 Ford Probe
  • P4B21 Ford Ranger
  • P4B21 Ford Taurus
  • P4B21 Ford Taurus X
  • P4B21 Ford Tempo
  • P4B21 Ford Thunderbird
  • P4B21 Ford Transit
  • P4B21 Ford Transit Connect
  • P4B21 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.