U1521

U1521 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U1521 Diagnosis

The output circuits that are powered by VBAT3 will all be inoperative. Other fault codes may be present, but troubleshoot for this first. The fuse in the main PDM powering this circuit may be open.Determine if the extra switch is not required for the vehicle or if the switch has been installed but the necessary reference parameter has not been programmed into the BHM.

This circuit connects to the CHM as an input at connector J3,P. The CHM passes the signal through to power the tail lamps and marker lamps from connector C2 pin G and also from connector C1 pins D, E, and F.

Ford U1521 Fault Code Meaning :

Ford U1521 Symptoms :

Ford U1521 Reasons :

How To Fix Ford U1521 Trouble Code ?

Which Ford cars have the code U1521?

  • U1521 Ford Aerostar
  • U1521 Ford Bronco
  • U1521 Ford C-Max
  • U1521 Ford C-Max Energi
  • U1521 Ford C-Max Hybrid
  • U1521 Ford Contour
  • U1521 Ford Crown Victoria
  • U1521 Ford EcoSport
  • U1521 Ford Econoline
  • U1521 Ford Edge
  • U1521 Ford Escape
  • U1521 Ford Escape Hybrid
  • U1521 Ford Escort
  • U1521 Ford Everest
  • U1521 Ford Excursion
  • U1521 Ford Expedition
  • U1521 Ford Explorer
  • U1521 Ford Explorer Sport Trac
  • U1521 Ford F-150
  • U1521 Ford F-250
  • U1521 Ford F-350
  • U1521 Ford Fiesta
  • U1521 Ford Flex
  • U1521 Ford Focus
  • U1521 Ford Focus Electric
  • U1521 Ford Freestar
  • U1521 Ford Freestyle
  • U1521 Ford Fusion
  • U1521 Ford Fusion Energi
  • U1521 Ford Fusion Hybrid
  • U1521 Ford Fusion Plug-In Hybrid
  • U1521 Ford GT
  • U1521 Ford Mustang
  • U1521 Ford Mustang Mach-E
  • U1521 Ford Mystique
  • U1521 Ford Probe
  • U1521 Ford Ranger
  • U1521 Ford Taurus
  • U1521 Ford Taurus X
  • U1521 Ford Tempo
  • U1521 Ford Thunderbird
  • U1521 Ford Transit
  • U1521 Ford Transit Connect
  • U1521 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.