U21AU

U21AU Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U21AU 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 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 U21AU Fault Code Meaning :

Ford U21AU Symptoms :

Ford U21AU Reasons :

How To Fix Ford U21AU Trouble Code ?

Which Ford cars have the code U21AU?

  • U21AU Ford Aerostar
  • U21AU Ford Bronco
  • U21AU Ford C-Max
  • U21AU Ford C-Max Energi
  • U21AU Ford C-Max Hybrid
  • U21AU Ford Contour
  • U21AU Ford Crown Victoria
  • U21AU Ford EcoSport
  • U21AU Ford Econoline
  • U21AU Ford Edge
  • U21AU Ford Escape
  • U21AU Ford Escape Hybrid
  • U21AU Ford Escort
  • U21AU Ford Everest
  • U21AU Ford Excursion
  • U21AU Ford Expedition
  • U21AU Ford Explorer
  • U21AU Ford Explorer Sport Trac
  • U21AU Ford F-150
  • U21AU Ford F-250
  • U21AU Ford F-350
  • U21AU Ford Fiesta
  • U21AU Ford Flex
  • U21AU Ford Focus
  • U21AU Ford Focus Electric
  • U21AU Ford Freestar
  • U21AU Ford Freestyle
  • U21AU Ford Fusion
  • U21AU Ford Fusion Energi
  • U21AU Ford Fusion Hybrid
  • U21AU Ford Fusion Plug-In Hybrid
  • U21AU Ford GT
  • U21AU Ford Mustang
  • U21AU Ford Mustang Mach-E
  • U21AU Ford Mystique
  • U21AU Ford Probe
  • U21AU Ford Ranger
  • U21AU Ford Taurus
  • U21AU Ford Taurus X
  • U21AU Ford Tempo
  • U21AU Ford Thunderbird
  • U21AU Ford Transit
  • U21AU Ford Transit Connect
  • U21AU 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.