P21AA

P21AA Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P21AA Diagnosis

The CHM does not suupport PWM type DRLs. The vehicle has a BHM mismatch with the CHM. Replace the CHM with one that is compatible with the BHM.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 OFF.

The top-of-clutch switch and bottom-of-clutch switch are both measured as closed at the same time. Troubleshoot for clutch switch shorted, or for a wiring fault between the clutch switch and the BHM.

Ford P21AA Fault Code Meaning :

Ford P21AA Symptoms :

Ford P21AA Reasons :

How To Fix Ford P21AA Trouble Code ?

Which Ford cars have the code P21AA?

  • P21AA Ford Aerostar
  • P21AA Ford Bronco
  • P21AA Ford C-Max
  • P21AA Ford C-Max Energi
  • P21AA Ford C-Max Hybrid
  • P21AA Ford Contour
  • P21AA Ford Crown Victoria
  • P21AA Ford EcoSport
  • P21AA Ford Econoline
  • P21AA Ford Edge
  • P21AA Ford Escape
  • P21AA Ford Escape Hybrid
  • P21AA Ford Escort
  • P21AA Ford Everest
  • P21AA Ford Excursion
  • P21AA Ford Expedition
  • P21AA Ford Explorer
  • P21AA Ford Explorer Sport Trac
  • P21AA Ford F-150
  • P21AA Ford F-250
  • P21AA Ford F-350
  • P21AA Ford Fiesta
  • P21AA Ford Flex
  • P21AA Ford Focus
  • P21AA Ford Focus Electric
  • P21AA Ford Freestar
  • P21AA Ford Freestyle
  • P21AA Ford Fusion
  • P21AA Ford Fusion Energi
  • P21AA Ford Fusion Hybrid
  • P21AA Ford Fusion Plug-In Hybrid
  • P21AA Ford GT
  • P21AA Ford Mustang
  • P21AA Ford Mustang Mach-E
  • P21AA Ford Mystique
  • P21AA Ford Probe
  • P21AA Ford Ranger
  • P21AA Ford Taurus
  • P21AA Ford Taurus X
  • P21AA Ford Tempo
  • P21AA Ford Thunderbird
  • P21AA Ford Transit
  • P21AA Ford Transit Connect
  • P21AA 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.