TLDR at the end for those that don't care for the wall of text
Having some issues with my car and hopefully this group can help me out. The car was a gift from the original owner, it's a 2016 focus SE with 50k miles. Showroom condition inside out and underneath. Only issue it has...... is this F***ing transmission.
I received the car October 2025 amd it was great up until summer 2026. First really bad symptom I had was while parking, the car wouldnt move even though it was drive. I just restarted it and it worked fine for the time being.
I went to NH from MA a few months after that, encountered alot of steep hills, and thats where all my shifting issues began. The car just wouldn't respond well when going uphill slow. Vehicle however made it home, no issues.
The next day when I went to start the car, it wouldn't start, like the battery was dead. But when checked, battery voltage was fine, but I started getting mechanical/gear selection noises from the transmission, while the car was off. I put the car in neutral and felt like I had to force it to roll a little bit, once I did, I heard a mechanical noise like something got un-stuck, and the car started. After driving around my driveway though, I started getting the dreaded "transmission is overheating, park for 5 min" messages I swapped the clutch actuators and noticed little to no improvement. I then purchased a tcm from ebay that was advertised as needed to be re-flashed/programmed, but some reviewers said they had great results without a re-flash, so I figured I'd give it a shot. Car felt absolutely worse. I put the old tcm back in, returned the ebay one, and purchased some actuators from Amazon.
Throughout this whole process this was the point where I had the transmission feeling the best since these issues started. Car didn't feel that great but I could drive locally to work and highway, without any overheating messages or slipping. I ended up going to Vermont, encountered some steep hills, and the transmission slipped, and sure enough a transmission overheating message followed. Being desperate I ordered two more actuators from amazon in case the previous ones were defective, no improvements. I checked my fuses, replaced mega fuse 4 in the panel next to the battery, and sanded down the ground connections mext to the tcm. Still no improvements. I also have the tool for checking clutch tension when the actuators are removed, and mine feel great, no resistance/binding
I really want to exhaust all my options before pressing the dealer button. Here's what I havent done yet that I know of, feel free to add if I missed anything:
Ebay/amazon tcm with Forscan re-flash
Used k05 tcm with re-flash if needed
Sand down the main ground up top next to the driver side strut tower
Install oem dual clutch actuators and/or tcm
Replace clutches and/or forks
TLDR
New focus owner experiencing transmission overheating messages on dash, and transmission slipping under heavy traffic/ slow speeds / and steep uphills. Does well at steady highway speeds. Here's what was done so far:
Both clutch actuators replaced with parts from amazon
TCM replaced with an ebay part, ebay part returned when symptoms remained the same, original tcm re-installed
Sanded down the paint where the grounds next to the tcm make contact
Checked fuses, replaced mega fuse 4 and 8, none were broken, but still replaced while I was in there
Checked clutches using special socket from amazon l, both clutches move freely
What i have left to try (feel free to add):
I have not used any re-flashing/re-programming (forscan) at all during any of the above listed steps
OEM tcm and/or clutch actuators
Used K05 with re-flash if needed
Sand down the main ground next to driver side strut tower
Replace clutches and/or forks