P0991

P0991 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P0991 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 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 P0991 Fault Code Meaning :

Ford P0991 Symptoms :

Ford P0991 Reasons :

How To Fix Ford P0991 Trouble Code ?

Which Ford cars have the code P0991?

  • P0991 Ford Aerostar
  • P0991 Ford Bronco
  • P0991 Ford C-Max
  • P0991 Ford C-Max Energi
  • P0991 Ford C-Max Hybrid
  • P0991 Ford Contour
  • P0991 Ford Crown Victoria
  • P0991 Ford EcoSport
  • P0991 Ford Econoline
  • P0991 Ford Edge
  • P0991 Ford Escape
  • P0991 Ford Escape Hybrid
  • P0991 Ford Escort
  • P0991 Ford Everest
  • P0991 Ford Excursion
  • P0991 Ford Expedition
  • P0991 Ford Explorer
  • P0991 Ford Explorer Sport Trac
  • P0991 Ford F-150
  • P0991 Ford F-250
  • P0991 Ford F-350
  • P0991 Ford Fiesta
  • P0991 Ford Flex
  • P0991 Ford Focus
  • P0991 Ford Focus Electric
  • P0991 Ford Freestar
  • P0991 Ford Freestyle
  • P0991 Ford Fusion
  • P0991 Ford Fusion Energi
  • P0991 Ford Fusion Hybrid
  • P0991 Ford Fusion Plug-In Hybrid
  • P0991 Ford GT
  • P0991 Ford Mustang
  • P0991 Ford Mustang Mach-E
  • P0991 Ford Mystique
  • P0991 Ford Probe
  • P0991 Ford Ranger
  • P0991 Ford Taurus
  • P0991 Ford Taurus X
  • P0991 Ford Tempo
  • P0991 Ford Thunderbird
  • P0991 Ford Transit
  • P0991 Ford Transit Connect
  • P0991 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.