Help please!

[Gabhsteve24]

my 2017 lincoln navigator started off with a cross traffic system fault, check engine light came on, code came up for turbo, then no fob detected ac wouldn’t turn on seats had no memory, side steps wouldn’t open. Took to ford dealer tech pulled code p0034,p0035 performed pin point test and found low. Voltage to vacuum selonoid. Repaired circuit and installed fuse. We paid an arm and leg and on the drive home it started detecting no fob again, side steps taking long to come out, when I remote started and pushed start button it wouldn’t turn on. Forward two days everything seems to be working but the blind spot/cross traffic fault is on and my ac turned on by itself while driving and my doors tried to relock while driving also. I don’t want to keep taking back to ford and keep paying so much for them to not find the problem. Wanted to know if anyone here has an answer?

 

[11MarkX]

I know it's difficult to find these days, but I think you need to find a good mechanic who knows how a car works, rather than a mechanic who only knows how to read a code scanner. Code scanners are great to find the part that went back.....but why did it go bad? Go back to the basics and do a battery load test, alternator charging and regulator. Sounds like a bad ground or loose connection. Start with the battery connections, ground wires to frame and block, alternator wiring, fuse box connections. Whenever wacky things happen, its usually a low voltage issue due to the above. Low voltage can ruin modules, since low voltage pulses, rather than streams power. When it pulses, excessive amps go up and can fry electronics, so get it fixed fast.

 

[driller]

Does the 2017 information display menu selection have a gauge readout for the vehicle voltage? I don't recall my former 2016 Navigator having such but I'm not sure about the 2017 model year.

You may want to get a cheap digital voltage gauge from an auto supply store that plugs into a 12V accessory outlet. Then you can monitor the system voltage and perhaps determine if you are experiencing low voltage issues. Several of your symptoms imply to me that you are experiencing a low voltage condition. As @11MarkX stated, several potential problems with the vehicle charging system could be the cause of your issues.