P21B4

P21B4 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P21B4 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.

Engine starting is disabled and other optional functions may be interrupted until the fault is corrected and the ignition switch is cycled.

Ford P21B4 Fault Code Meaning :

Ford P21B4 Symptoms :

Ford P21B4 Reasons :

How To Fix Ford P21B4 Trouble Code ?

Which Ford cars have the code P21B4?

  • P21B4 Ford Aerostar
  • P21B4 Ford Bronco
  • P21B4 Ford C-Max
  • P21B4 Ford C-Max Energi
  • P21B4 Ford C-Max Hybrid
  • P21B4 Ford Contour
  • P21B4 Ford Crown Victoria
  • P21B4 Ford EcoSport
  • P21B4 Ford Econoline
  • P21B4 Ford Edge
  • P21B4 Ford Escape
  • P21B4 Ford Escape Hybrid
  • P21B4 Ford Escort
  • P21B4 Ford Everest
  • P21B4 Ford Excursion
  • P21B4 Ford Expedition
  • P21B4 Ford Explorer
  • P21B4 Ford Explorer Sport Trac
  • P21B4 Ford F-150
  • P21B4 Ford F-250
  • P21B4 Ford F-350
  • P21B4 Ford Fiesta
  • P21B4 Ford Flex
  • P21B4 Ford Focus
  • P21B4 Ford Focus Electric
  • P21B4 Ford Freestar
  • P21B4 Ford Freestyle
  • P21B4 Ford Fusion
  • P21B4 Ford Fusion Energi
  • P21B4 Ford Fusion Hybrid
  • P21B4 Ford Fusion Plug-In Hybrid
  • P21B4 Ford GT
  • P21B4 Ford Mustang
  • P21B4 Ford Mustang Mach-E
  • P21B4 Ford Mystique
  • P21B4 Ford Probe
  • P21B4 Ford Ranger
  • P21B4 Ford Taurus
  • P21B4 Ford Taurus X
  • P21B4 Ford Tempo
  • P21B4 Ford Thunderbird
  • P21B4 Ford Transit
  • P21B4 Ford Transit Connect
  • P21B4 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.