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Our 2016 MKX was having intermittent problems with the liftgate not opening which became worse and was also draining the battery.  I spent a large amount of time chasing a 1.4 amp parasitic drain on the battery (thinking this was connected with the lift gate problem) before giving up and taking it to a local small town Ford dealer.  They replaced the latch for the lift gate which is under the plastic trim.  I started to do this myself as I had the trim off but was not sure it was my problem    I'm not sure of the exact cost because they were also chasing the electrical problem which turned out to be a defect in the instrument cluster that had to be replaced.  They had the car for almost 2 weeks and reprogrammed every module on the car with several calls to the ford tech hot line.  The latch was replaced the first day and the tech said they do about one a week for the power lift gates. The total bill was $2,400 and I am guessing the latch would be about $500 with parts and labor.  If you're into DYI, the panel is not hard to remove with the cheap plastic tool you can buy anywhere; however, getting the thing back together was not so simple as 3 of the plastic connectors broke and had to be replaced.  I had to go to the local dealer twice to find the right snaps.  

Little late on the response to this question, but if you haven't sorted it out already, it is/was probably the wiring harnesses that lead to each EPB motor.  One on each side, and are a little over a foot long if memory serves.  I also have a 2016 and had to do this on mine as I had one side fail and the other was on its way.  Cause is corrosion in the wiring harness. Seems to seep down the wires and eventually they will break.  Also had this happen to the front camera harness.  

I did this on my 2008 MKX and it worked!! Thanks so much for the info! 

Unplugging the actuator and plugging it back in while the car was running fixed the issue on my 2013 Lincoln MKX. Thanks for the tip!

Hey John I replaced my spindle and the noise is completely gone. It could have been a bad wheel bearing or a bent spindle. I’ll never know but it’s the best $70 i’ve ever spent. 

Hi, I'm Doug, new to the group. The reason I joined, I'm having trouble with rear windows on this car. Ive ohmed #48 fuse, says good. They work occasionally, but its brief. Even if that #48 ohms good, could that circuit brkr/fuse still be bad? Anybody else had any trouble?

Can the seat heaters come on when you use the key fab to auto start on a 2017 MKX Reserve