B0840

B0840 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

B0840 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 End of Frame air output circuit is commanded OFF, but air pressure is detected at the pressure feedback switch. Troubleshoot for an End of Frame air solenoid fault, and for an air pressure switch short circuit fault.

Ford B0840 Fault Code Meaning :

Ford B0840 Symptoms :

Ford B0840 Reasons :

How To Fix Ford B0840 Trouble Code ?

Which Ford cars have the code B0840?

  • B0840 Ford Aerostar
  • B0840 Ford Bronco
  • B0840 Ford C-Max
  • B0840 Ford C-Max Energi
  • B0840 Ford C-Max Hybrid
  • B0840 Ford Contour
  • B0840 Ford Crown Victoria
  • B0840 Ford EcoSport
  • B0840 Ford Econoline
  • B0840 Ford Edge
  • B0840 Ford Escape
  • B0840 Ford Escape Hybrid
  • B0840 Ford Escort
  • B0840 Ford Everest
  • B0840 Ford Excursion
  • B0840 Ford Expedition
  • B0840 Ford Explorer
  • B0840 Ford Explorer Sport Trac
  • B0840 Ford F-150
  • B0840 Ford F-250
  • B0840 Ford F-350
  • B0840 Ford Fiesta
  • B0840 Ford Flex
  • B0840 Ford Focus
  • B0840 Ford Focus Electric
  • B0840 Ford Freestar
  • B0840 Ford Freestyle
  • B0840 Ford Fusion
  • B0840 Ford Fusion Energi
  • B0840 Ford Fusion Hybrid
  • B0840 Ford Fusion Plug-In Hybrid
  • B0840 Ford GT
  • B0840 Ford Mustang
  • B0840 Ford Mustang Mach-E
  • B0840 Ford Mystique
  • B0840 Ford Probe
  • B0840 Ford Ranger
  • B0840 Ford Taurus
  • B0840 Ford Taurus X
  • B0840 Ford Tempo
  • B0840 Ford Thunderbird
  • B0840 Ford Transit
  • B0840 Ford Transit Connect
  • B0840 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.