U3977

U3977 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U3977 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 supplies battery power on this circuit when the key is in the RUN or CRANK positions. Troubleshoot for a wiring fault shorting this circuit to ground or for too many optional circuits spliced into it that is causing the BHM to turn it off.

When the engine is in higher engine speed and torque condition, the differential pressure over the DPF is expected to rise according to engine speed and torque. If the differential pressure exceeds a threshold then the differential pressure sensor plausibility DTC is set.

Ford U3977 Fault Code Meaning :

Ford U3977 Symptoms :

Ford U3977 Reasons :

How To Fix Ford U3977 Trouble Code ?

Which Ford cars have the code U3977?

  • U3977 Ford Aerostar
  • U3977 Ford Bronco
  • U3977 Ford C-Max
  • U3977 Ford C-Max Energi
  • U3977 Ford C-Max Hybrid
  • U3977 Ford Contour
  • U3977 Ford Crown Victoria
  • U3977 Ford EcoSport
  • U3977 Ford Econoline
  • U3977 Ford Edge
  • U3977 Ford Escape
  • U3977 Ford Escape Hybrid
  • U3977 Ford Escort
  • U3977 Ford Everest
  • U3977 Ford Excursion
  • U3977 Ford Expedition
  • U3977 Ford Explorer
  • U3977 Ford Explorer Sport Trac
  • U3977 Ford F-150
  • U3977 Ford F-250
  • U3977 Ford F-350
  • U3977 Ford Fiesta
  • U3977 Ford Flex
  • U3977 Ford Focus
  • U3977 Ford Focus Electric
  • U3977 Ford Freestar
  • U3977 Ford Freestyle
  • U3977 Ford Fusion
  • U3977 Ford Fusion Energi
  • U3977 Ford Fusion Hybrid
  • U3977 Ford Fusion Plug-In Hybrid
  • U3977 Ford GT
  • U3977 Ford Mustang
  • U3977 Ford Mustang Mach-E
  • U3977 Ford Mystique
  • U3977 Ford Probe
  • U3977 Ford Ranger
  • U3977 Ford Taurus
  • U3977 Ford Taurus X
  • U3977 Ford Tempo
  • U3977 Ford Thunderbird
  • U3977 Ford Transit
  • U3977 Ford Transit Connect
  • U3977 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.