P3921

P3921 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P3921 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 P3921 Fault Code Meaning :

Ford P3921 Symptoms :

Ford P3921 Reasons :

How To Fix Ford P3921 Trouble Code ?

Which Ford cars have the code P3921?

  • P3921 Ford Aerostar
  • P3921 Ford Bronco
  • P3921 Ford C-Max
  • P3921 Ford C-Max Energi
  • P3921 Ford C-Max Hybrid
  • P3921 Ford Contour
  • P3921 Ford Crown Victoria
  • P3921 Ford EcoSport
  • P3921 Ford Econoline
  • P3921 Ford Edge
  • P3921 Ford Escape
  • P3921 Ford Escape Hybrid
  • P3921 Ford Escort
  • P3921 Ford Everest
  • P3921 Ford Excursion
  • P3921 Ford Expedition
  • P3921 Ford Explorer
  • P3921 Ford Explorer Sport Trac
  • P3921 Ford F-150
  • P3921 Ford F-250
  • P3921 Ford F-350
  • P3921 Ford Fiesta
  • P3921 Ford Flex
  • P3921 Ford Focus
  • P3921 Ford Focus Electric
  • P3921 Ford Freestar
  • P3921 Ford Freestyle
  • P3921 Ford Fusion
  • P3921 Ford Fusion Energi
  • P3921 Ford Fusion Hybrid
  • P3921 Ford Fusion Plug-In Hybrid
  • P3921 Ford GT
  • P3921 Ford Mustang
  • P3921 Ford Mustang Mach-E
  • P3921 Ford Mystique
  • P3921 Ford Probe
  • P3921 Ford Ranger
  • P3921 Ford Taurus
  • P3921 Ford Taurus X
  • P3921 Ford Tempo
  • P3921 Ford Thunderbird
  • P3921 Ford Transit
  • P3921 Ford Transit Connect
  • P3921 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.