P1821

P1821 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P1821 Diagnosis

The output circuits that are powered by VBAT2 will all be inoperative. Other fault codes may be present, but troubleshoot for this first. 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 P1821 Fault Code Meaning :

Ford P1821 Symptoms :

Ford P1821 Reasons :

How To Fix Ford P1821 Trouble Code ?

Which Ford cars have the code P1821?

  • P1821 Ford Aerostar
  • P1821 Ford Bronco
  • P1821 Ford C-Max
  • P1821 Ford C-Max Energi
  • P1821 Ford C-Max Hybrid
  • P1821 Ford Contour
  • P1821 Ford Crown Victoria
  • P1821 Ford EcoSport
  • P1821 Ford Econoline
  • P1821 Ford Edge
  • P1821 Ford Escape
  • P1821 Ford Escape Hybrid
  • P1821 Ford Escort
  • P1821 Ford Everest
  • P1821 Ford Excursion
  • P1821 Ford Expedition
  • P1821 Ford Explorer
  • P1821 Ford Explorer Sport Trac
  • P1821 Ford F-150
  • P1821 Ford F-250
  • P1821 Ford F-350
  • P1821 Ford Fiesta
  • P1821 Ford Flex
  • P1821 Ford Focus
  • P1821 Ford Focus Electric
  • P1821 Ford Freestar
  • P1821 Ford Freestyle
  • P1821 Ford Fusion
  • P1821 Ford Fusion Energi
  • P1821 Ford Fusion Hybrid
  • P1821 Ford Fusion Plug-In Hybrid
  • P1821 Ford GT
  • P1821 Ford Mustang
  • P1821 Ford Mustang Mach-E
  • P1821 Ford Mystique
  • P1821 Ford Probe
  • P1821 Ford Ranger
  • P1821 Ford Taurus
  • P1821 Ford Taurus X
  • P1821 Ford Tempo
  • P1821 Ford Thunderbird
  • P1821 Ford Transit
  • P1821 Ford Transit Connect
  • P1821 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.