P3977

P3977 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P3977 Diagnosis

The PTO 1 output circuit is commanded OFF, but air pressure is detected at the pressure feedback switch. Troubleshoot for PTO 2 air solenoid fault, and for air pressure switch short circuit fault.The position information for the switch becomes Not Available. Remove the duplicate Smart Switch, then use ServiceLink to verify that the correct Smart Switches are configured for the vehicle.

A comparison of pressures from all sensors is made. The smallest difference between the three is determined and a reference pressure is calculated. The Barometric pressure sensor value is compared to the reference value and if the difference is above the threshold a DTC is reported.

Ford P3977 Fault Code Meaning :

Ford P3977 Symptoms :

Ford P3977 Reasons :

How To Fix Ford P3977 Trouble Code ?

Which Ford cars have the code P3977?

  • P3977 Ford Aerostar
  • P3977 Ford Bronco
  • P3977 Ford C-Max
  • P3977 Ford C-Max Energi
  • P3977 Ford C-Max Hybrid
  • P3977 Ford Contour
  • P3977 Ford Crown Victoria
  • P3977 Ford EcoSport
  • P3977 Ford Econoline
  • P3977 Ford Edge
  • P3977 Ford Escape
  • P3977 Ford Escape Hybrid
  • P3977 Ford Escort
  • P3977 Ford Everest
  • P3977 Ford Excursion
  • P3977 Ford Expedition
  • P3977 Ford Explorer
  • P3977 Ford Explorer Sport Trac
  • P3977 Ford F-150
  • P3977 Ford F-250
  • P3977 Ford F-350
  • P3977 Ford Fiesta
  • P3977 Ford Flex
  • P3977 Ford Focus
  • P3977 Ford Focus Electric
  • P3977 Ford Freestar
  • P3977 Ford Freestyle
  • P3977 Ford Fusion
  • P3977 Ford Fusion Energi
  • P3977 Ford Fusion Hybrid
  • P3977 Ford Fusion Plug-In Hybrid
  • P3977 Ford GT
  • P3977 Ford Mustang
  • P3977 Ford Mustang Mach-E
  • P3977 Ford Mystique
  • P3977 Ford Probe
  • P3977 Ford Ranger
  • P3977 Ford Taurus
  • P3977 Ford Taurus X
  • P3977 Ford Tempo
  • P3977 Ford Thunderbird
  • P3977 Ford Transit
  • P3977 Ford Transit Connect
  • P3977 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.