B3977

B3977 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

B3977 Diagnosis

The output circuits that are powered by VBAT2 will all be inoperative. Other fault codes may be present, but troubleshoot for this first. 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 B3977 Fault Code Meaning :

Ford B3977 Symptoms :

Ford B3977 Reasons :

How To Fix Ford B3977 Trouble Code ?

Which Ford cars have the code B3977?

  • B3977 Ford Aerostar
  • B3977 Ford Bronco
  • B3977 Ford C-Max
  • B3977 Ford C-Max Energi
  • B3977 Ford C-Max Hybrid
  • B3977 Ford Contour
  • B3977 Ford Crown Victoria
  • B3977 Ford EcoSport
  • B3977 Ford Econoline
  • B3977 Ford Edge
  • B3977 Ford Escape
  • B3977 Ford Escape Hybrid
  • B3977 Ford Escort
  • B3977 Ford Everest
  • B3977 Ford Excursion
  • B3977 Ford Expedition
  • B3977 Ford Explorer
  • B3977 Ford Explorer Sport Trac
  • B3977 Ford F-150
  • B3977 Ford F-250
  • B3977 Ford F-350
  • B3977 Ford Fiesta
  • B3977 Ford Flex
  • B3977 Ford Focus
  • B3977 Ford Focus Electric
  • B3977 Ford Freestar
  • B3977 Ford Freestyle
  • B3977 Ford Fusion
  • B3977 Ford Fusion Energi
  • B3977 Ford Fusion Hybrid
  • B3977 Ford Fusion Plug-In Hybrid
  • B3977 Ford GT
  • B3977 Ford Mustang
  • B3977 Ford Mustang Mach-E
  • B3977 Ford Mystique
  • B3977 Ford Probe
  • B3977 Ford Ranger
  • B3977 Ford Taurus
  • B3977 Ford Taurus X
  • B3977 Ford Tempo
  • B3977 Ford Thunderbird
  • B3977 Ford Transit
  • B3977 Ford Transit Connect
  • B3977 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.