P638A

P638A Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

P638A 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.Determine if the extra switch is not required for the vehicle or if the switch has been installed but the necessary reference parameter has not been programmed into the BHM.

This circuit connects to the CHM as an input at connector J3,P. The CHM passes the signal through to power the tail lamps and marker lamps from connector C2 pin G and also from connector C1 pins D, E, and F.

Ford P638A Fault Code Meaning :

Ford P638A Symptoms :

Ford P638A Reasons :

How To Fix Ford P638A Trouble Code ?

Which Ford cars have the code P638A?

  • P638A Ford Aerostar
  • P638A Ford Bronco
  • P638A Ford C-Max
  • P638A Ford C-Max Energi
  • P638A Ford C-Max Hybrid
  • P638A Ford Contour
  • P638A Ford Crown Victoria
  • P638A Ford EcoSport
  • P638A Ford Econoline
  • P638A Ford Edge
  • P638A Ford Escape
  • P638A Ford Escape Hybrid
  • P638A Ford Escort
  • P638A Ford Everest
  • P638A Ford Excursion
  • P638A Ford Expedition
  • P638A Ford Explorer
  • P638A Ford Explorer Sport Trac
  • P638A Ford F-150
  • P638A Ford F-250
  • P638A Ford F-350
  • P638A Ford Fiesta
  • P638A Ford Flex
  • P638A Ford Focus
  • P638A Ford Focus Electric
  • P638A Ford Freestar
  • P638A Ford Freestyle
  • P638A Ford Fusion
  • P638A Ford Fusion Energi
  • P638A Ford Fusion Hybrid
  • P638A Ford Fusion Plug-In Hybrid
  • P638A Ford GT
  • P638A Ford Mustang
  • P638A Ford Mustang Mach-E
  • P638A Ford Mystique
  • P638A Ford Probe
  • P638A Ford Ranger
  • P638A Ford Taurus
  • P638A Ford Taurus X
  • P638A Ford Tempo
  • P638A Ford Thunderbird
  • P638A Ford Transit
  • P638A Ford Transit Connect
  • P638A 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.