Attached some images. There's a long post sticking up in the engine bay for the negative connection and sits closer to the front frame. Although you can use any other metal spot in the engine bay of course. Just make sure it is actual metal, not painted.
Also a photo of the 12v battery location which is in the rear. Same whether a hybrid of Energi model (Mine's an Energi in this pic). Some trim disassembly is required to get access.
I tried to charge the 12v battery . . . the positive post is easy to find, but the owner's manual isn't clear as to where the negative post might be. There is nothing in the area pointed out in the manual that looks like a post to attach the negative lead. And -- where is the 12v battery located? I'll have to dig deeper into the manual. It's more like trying to get a new computer up and running than operating a car. Welcome to the 21st century, I guess.
My daughter's c-max had a dead battery when she accidentally left headlights on one night.
She kept jumping the battery and it would only last a couple days.
We put a charger on it and charged it to 100% and no issues now for a couple months.
Her battery was so low initially that the radio wouldn't even work.
I have a 2014 C-Max Energi. I wanted to switch my back tires with each other. I tried to use the place where the 2 thick metal sheets come together below, but they bent right over when I put any pressure on them. I also see quite a bit of rust underneath, so that is probably why. Anyway, I finally took 2 hydraulic jacks and put a board in between and got right under the back axle, between the wheels, and lifted it up that way. Worked really well. Both wheels were slightly off the ground and i could easily switch them. Marty from Michigan
Nothing good happens with a weak 12V battery. Try charging it (battery recharge posts under hood on drivers side) to see if that helps. But be prepared for a replacement. Also, search the forum for lots more 12v info.
Cheers, and welcome.
You're the only other person I've heard of with so many issues! My 2017 C-Max Energi has given me a lot of grief also. After leasing it for two years the seat heater gave out. Dealership spent a month replacing stuff until they just replaced the whole front seat. I was leasing it at this point so this was covered by warranty. This was minor compared to the next issue.
A couple of years later my C-Max would overheat and I would have to pull over to let it cool down. Context: My husband and I would often take ~2000 mi (round trip) road trips a couple of times a year to visit family. The C-Max always handled it very well until the engine overheating issue started. We brought it to the dealer and they ended up replacing the whole transmission. Car only had 78,000 miles or so on it. The dealership had the car for six months because the transmissions were backordered from Ford. Silver lining: I had gotten a warranty when I purchased the car after the lease ended. So I didn't have to pay for the repairs.
So yeah, now I have a love-hate relationship with my C-Max. I feel your pain lol.
Also C-Min(imum) is great lolol.
Welcome to the forum. Tire noise: C-Max is so quiet you hear/notice noises you don't usually do on ICE vehicles. They should quieten down as they settle in or you get use to the noise, Inconsistent warning lights, rear hatch: possible weak 12v battery or weak battery in key fob. As an owner of a 2013, it's NOT maroon, it's called Ruby Red. Sounds more regal & expensive, don't you think?
Good to see another 2015 buyer! Just brought my little red hybrid gumdrop home late last week. I hope your seller had both the key fobs for you -- my seller didn't inform me that he had misplaced one until he had the check in hand. Best of luck to you!