U1840

U1840 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U1840 Diagnosis

The BHM supplies battery power on this circuit when the key is in the RUN or CRANK positions. Troubleshoot for an open 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 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 U1840 Fault Code Meaning :

Ford U1840 Symptoms :

Ford U1840 Reasons :

How To Fix Ford U1840 Trouble Code ?

Which Ford cars have the code U1840?

  • U1840 Ford Aerostar
  • U1840 Ford Bronco
  • U1840 Ford C-Max
  • U1840 Ford C-Max Energi
  • U1840 Ford C-Max Hybrid
  • U1840 Ford Contour
  • U1840 Ford Crown Victoria
  • U1840 Ford EcoSport
  • U1840 Ford Econoline
  • U1840 Ford Edge
  • U1840 Ford Escape
  • U1840 Ford Escape Hybrid
  • U1840 Ford Escort
  • U1840 Ford Everest
  • U1840 Ford Excursion
  • U1840 Ford Expedition
  • U1840 Ford Explorer
  • U1840 Ford Explorer Sport Trac
  • U1840 Ford F-150
  • U1840 Ford F-250
  • U1840 Ford F-350
  • U1840 Ford Fiesta
  • U1840 Ford Flex
  • U1840 Ford Focus
  • U1840 Ford Focus Electric
  • U1840 Ford Freestar
  • U1840 Ford Freestyle
  • U1840 Ford Fusion
  • U1840 Ford Fusion Energi
  • U1840 Ford Fusion Hybrid
  • U1840 Ford Fusion Plug-In Hybrid
  • U1840 Ford GT
  • U1840 Ford Mustang
  • U1840 Ford Mustang Mach-E
  • U1840 Ford Mystique
  • U1840 Ford Probe
  • U1840 Ford Ranger
  • U1840 Ford Taurus
  • U1840 Ford Taurus X
  • U1840 Ford Tempo
  • U1840 Ford Thunderbird
  • U1840 Ford Transit
  • U1840 Ford Transit Connect
  • U1840 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.