U1421

U1421 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U1421 Diagnosis

This fault indicates that the circuit is drawing more current than it is designed to supply, and possibly there is a wiring fault shorting this circuit to ground. The fault remains active until the ignition is turned ON when the fault is no longer present.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 BHM drives the 5 cab overhead clearance and ID lamps from connector B5 pin C on circuit 46. All other marker and tail lamps are driven from BHM connector B1,K on circuit 23. This circuit connects to the CHM as an input at connector J3,P.

Ford U1421 Fault Code Meaning :

Ford U1421 Symptoms :

Ford U1421 Reasons :

How To Fix Ford U1421 Trouble Code ?

Which Ford cars have the code U1421?

  • U1421 Ford Aerostar
  • U1421 Ford Bronco
  • U1421 Ford C-Max
  • U1421 Ford C-Max Energi
  • U1421 Ford C-Max Hybrid
  • U1421 Ford Contour
  • U1421 Ford Crown Victoria
  • U1421 Ford EcoSport
  • U1421 Ford Econoline
  • U1421 Ford Edge
  • U1421 Ford Escape
  • U1421 Ford Escape Hybrid
  • U1421 Ford Escort
  • U1421 Ford Everest
  • U1421 Ford Excursion
  • U1421 Ford Expedition
  • U1421 Ford Explorer
  • U1421 Ford Explorer Sport Trac
  • U1421 Ford F-150
  • U1421 Ford F-250
  • U1421 Ford F-350
  • U1421 Ford Fiesta
  • U1421 Ford Flex
  • U1421 Ford Focus
  • U1421 Ford Focus Electric
  • U1421 Ford Freestar
  • U1421 Ford Freestyle
  • U1421 Ford Fusion
  • U1421 Ford Fusion Energi
  • U1421 Ford Fusion Hybrid
  • U1421 Ford Fusion Plug-In Hybrid
  • U1421 Ford GT
  • U1421 Ford Mustang
  • U1421 Ford Mustang Mach-E
  • U1421 Ford Mystique
  • U1421 Ford Probe
  • U1421 Ford Ranger
  • U1421 Ford Taurus
  • U1421 Ford Taurus X
  • U1421 Ford Tempo
  • U1421 Ford Thunderbird
  • U1421 Ford Transit
  • U1421 Ford Transit Connect
  • U1421 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.