U1644

U1644 Ford engine fault code diagnosis, code meaning,symptoms and how to fix it.

U1644 Diagnosis

The axle lift 2 output circuit is commanded OFF, but air pressure is detected at the pressure feedback switch. Troubleshoot for axle lift 2 air solenoid fault, and for air pressure switch short circuit fault.The BHM supplies battery power on this circuit when the key is in the RUN or CRANK positions. Troubleshoot for a wiring fault shorting this circuit to ground or for too many optional circuits spliced into it that is causing the BHM to turn it off.

When the engine is in higher engine speed and torque condition, the differential pressure over the DPF is expected to rise according to engine speed and torque. If the differential pressure exceeds a threshold then the differential pressure sensor plausibility DTC is set.

Ford U1644 Fault Code Meaning :

Ford U1644 Symptoms :

Ford U1644 Reasons :

How To Fix Ford U1644 Trouble Code ?

Which Ford cars have the code U1644?

  • U1644 Ford Aerostar
  • U1644 Ford Bronco
  • U1644 Ford C-Max
  • U1644 Ford C-Max Energi
  • U1644 Ford C-Max Hybrid
  • U1644 Ford Contour
  • U1644 Ford Crown Victoria
  • U1644 Ford EcoSport
  • U1644 Ford Econoline
  • U1644 Ford Edge
  • U1644 Ford Escape
  • U1644 Ford Escape Hybrid
  • U1644 Ford Escort
  • U1644 Ford Everest
  • U1644 Ford Excursion
  • U1644 Ford Expedition
  • U1644 Ford Explorer
  • U1644 Ford Explorer Sport Trac
  • U1644 Ford F-150
  • U1644 Ford F-250
  • U1644 Ford F-350
  • U1644 Ford Fiesta
  • U1644 Ford Flex
  • U1644 Ford Focus
  • U1644 Ford Focus Electric
  • U1644 Ford Freestar
  • U1644 Ford Freestyle
  • U1644 Ford Fusion
  • U1644 Ford Fusion Energi
  • U1644 Ford Fusion Hybrid
  • U1644 Ford Fusion Plug-In Hybrid
  • U1644 Ford GT
  • U1644 Ford Mustang
  • U1644 Ford Mustang Mach-E
  • U1644 Ford Mystique
  • U1644 Ford Probe
  • U1644 Ford Ranger
  • U1644 Ford Taurus
  • U1644 Ford Taurus X
  • U1644 Ford Tempo
  • U1644 Ford Thunderbird
  • U1644 Ford Transit
  • U1644 Ford Transit Connect
  • U1644 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.