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Hello, I am having issues with my 2018 Ford fusion hybrid. Could this possibly be the 12 volt battery aswell? I replaced my power steering, checked all my grounds replaced a headlight assembly, checked all my fuses and my front and left abs wires and I can't figure it out. I'm getting no communication codes to everything.

My 2013 Ford Fusion S with a 6F35 transmission had recently exhibited symptoms of jerky transmission shifts around the 90,000 mile mark. It eventually got to the point that the transmission would not engage in 1st or 2nd gear and instead, after waiting for approximately 7 seconds, would loudly engage into overdrive mode. From my reading of information on AllDataDIY, this is a safety feature that defaults into certain parameters. This of course generates an orange check engine light in the form of a water pump icon. This is the stored DTC of P0751 (and most likely P2700 as well per the service manual). When the transmission tries to engage the first gear governed by shift solenoid A, it essentially revs the engine without effect on the transmission. It will then go back to overdrive. After a few failed attempts, it will illuminate the orange wrench and stay in safety mode from that point forward, until the car restarts. After changing the transmission fluid with Mercon LV directly from the dealership on three (3) separate occasions, the problem persists. The other gear of reverse is fine and it smoothly engages. If anything, I have preserved the functionality of the transmission with the passive drain and fill procedures along with slowly driving in RPM ranges of 1500 to 2000. On a side note, I determined that the fill procedure involving the oil leveling plug on the side of the transmission case is absolutely necessary. When I originally drained the fluid and measured, I filled back the same amount. When the transmission shuddered upon reverse being engaged, I added the extra quarter of a quart of ATF. This fixed the problem but then something strange happened next. As I was driving down the road, I would hear these burping sounds or popping noises that originally sounded like problems with the CV joints. When I added an additional quarter of a quart of Mercon LV ATF to continue to test the amount of fluid needed without opening that oil leveling plug, it got worse. In fact, it started making these bubbling noises while in park so I decided to burp the system with a new drain and fill. When I filled the fluid again with 4.25 quarts and started the car, shifting the gears and staying in park, I opened the oil leveling plug hole with a 5mm hex key. (Of note was the levelness of the car, verified with a simple level purchased at Walmart for a few dollars.) Nothing came out so I closed the port, turned off the car, filled another .25 quarts and repeated the procedure. Again, nothing came out but there was now fluid on the threads. The popping noises went away and the shifting has been fine in the current safety mode. Now that I want to replace the Solenoid A, I am having difficulty removing the 20-pin connector on the main control cover, underneath the air box. Has anyone ever dealt with this connector before?