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Take it to a battery place they will load test it for free.

After having original battery replaced 20mo. ago it was 6yrs. old. New replacement interstate battery. Was completely dead this morning. How can I load test? 

Thanks, disconnecting the 12v battery seems to have fixed the problem. I was surprised that the radio presets & info center trackings [left side of dash pod] both were retained. After reconnecting both began at the starting point screen but only had to push a few buttons on the steering wheel controls or the radio touchscreen to get back to normal. I guess the problem may have been started during a Sirius update that didn't quite take for some reason, [driving thru a dead signal spot for example]. 

No trouble, Ford dealer had best price.  It was the last one they had in stock though with $18 core charge. Autozone and O'reilly both had them too as an equivalent but looked like the same battery with different stickers.    

Excellent news.  Thank you.   Did you have any difficulty finding the replacement?  My sense is the that particular battery group is hard to find.     Cheers.

We changed 12V battery in my daughter's 2013 Hybrid this week.  Replacement was $199 at Ford dealer.  This was the cheapest price I found and cost less than non-ford solutions. Old battery lasted 7 years. Had a problem removing the plastic clamp on the bottom of the battery.  The bolt got loose but failed to fully remove.  Bolt was a little rusty and it was spinning the threaded nut under the plastic clamp. Was able to reach under the car and grab onto the bottom of the threaded nut with pliers to keep it from spinning for full removal. Previous battery was replaced in 2018 by ford dealer that offered a free install but unfortunately they over-tightened the nut on the Positive + clamp and that cracked the clamp body and it came apart when I removed it. Ford doesn't sell just the broken clamp part, they sell an assembly of the parts connected to it for $320.  However I was able to get a universal clamp at autozone for $10 that worked just fine. After install charged the new battery fully and then ran the manual procedure to reset the battery age to 0.  That process worked and was able to the run the radio 10 min after turning the car off.  

Guess I would try disconnecting 12V battery for a minute.  Master Reset!

Recent problem I've never seen before or even heard of. Usually when I stop & turn off the car, when I return the radio & climate control & others start back where they were. Now the CC has to be manually turned on, always reverting to AUTO mode, AC on & no directional settings. Pulled the CC fuse [#71], started car with fuse out, reinserted fuse hoping to reboot CC. No effect. It acts as if the CC module has a button battery for memory that has gone bad. Really, Really don't want to take to local Ford dealer as they charge $175 just to look. THANKS for any advice & thanks for the read.

Gotcha, I appreciate the reply though! I’ll definitely have to do some research on FORScan versions. As for the comments, I’ll link the thread that has them. It’s about some work around a guy did by wiring a relay, so that the radio shuts off/on with ignition. A couple people there commented on their run ins with dealerships and TSBs.  

I haven't unfortunately. Had a lot of changes with my #dayjob situation the past couple years that I haven't had any free time to dig in to C-Max related stuff I've wanted to do. I have a long todo list built up already. lol.   The update is pretty easy and quick. You just need access to a Forscan version that has the ability to do firmware updates (or Ford's IDS/FDRS and a compatible adapter). I believe you need to reach out to their support team now for that. Not sure. But you'd just go to the ACM firmware update pane and it should show available updates that Forscan has documented. The entire process takes under 10 minutes as I recall. If there are any concerns about health of your 12v battery, it's probably a good idea to put a battery tender/maintainer on it capable of at least 8-10 amps output. During the update process by default it shuts down the rest of the vehicle so the DC-DC converter (or EVSE if you have an Energi) should not be relied upon.   I'm curious about the comment about the TSB though. I haven't seen those same comments/posts. Got any links? I'd be curious if the proper module was not done and maybe the ACM was confused with the Sync system?