U3421

U3421 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U3421 Diagnosis

The PTO 1 output circuit is commanded OFF, but air pressure is detected at the pressure feedback switch. Troubleshoot for PTO 2 air solenoid fault, and for air pressure switch short circuit fault.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 OFF.

The top-of-clutch switch and bottom-of-clutch switch are both measured as closed at the same time. Troubleshoot for clutch switch shorted, or for a wiring fault between the clutch switch and the BHM.

Ford U3421 Fault Code Meaning :

Ford U3421 Symptoms :

Ford U3421 Reasons :

How To Fix Ford U3421 Trouble Code ?

Which Ford cars have the code U3421?

  • U3421 Ford Aerostar
  • U3421 Ford Bronco
  • U3421 Ford C-Max
  • U3421 Ford C-Max Energi
  • U3421 Ford C-Max Hybrid
  • U3421 Ford Contour
  • U3421 Ford Crown Victoria
  • U3421 Ford EcoSport
  • U3421 Ford Econoline
  • U3421 Ford Edge
  • U3421 Ford Escape
  • U3421 Ford Escape Hybrid
  • U3421 Ford Escort
  • U3421 Ford Everest
  • U3421 Ford Excursion
  • U3421 Ford Expedition
  • U3421 Ford Explorer
  • U3421 Ford Explorer Sport Trac
  • U3421 Ford F-150
  • U3421 Ford F-250
  • U3421 Ford F-350
  • U3421 Ford Fiesta
  • U3421 Ford Flex
  • U3421 Ford Focus
  • U3421 Ford Focus Electric
  • U3421 Ford Freestar
  • U3421 Ford Freestyle
  • U3421 Ford Fusion
  • U3421 Ford Fusion Energi
  • U3421 Ford Fusion Hybrid
  • U3421 Ford Fusion Plug-In Hybrid
  • U3421 Ford GT
  • U3421 Ford Mustang
  • U3421 Ford Mustang Mach-E
  • U3421 Ford Mystique
  • U3421 Ford Probe
  • U3421 Ford Ranger
  • U3421 Ford Taurus
  • U3421 Ford Taurus X
  • U3421 Ford Tempo
  • U3421 Ford Thunderbird
  • U3421 Ford Transit
  • U3421 Ford Transit Connect
  • U3421 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.