What is a P0685 Code and why would my 08 RDX now be stalling?

Wow, not sure our issues are the same as I don't have a unusual noises. However, I also had my car in with the dealership for a week while they attempted to duplicate and track down the issue. Long story short, the dealership couldn't find anything wrong with my car but charged me $175 diagnostic fee. As the issue continued after that, my husband began checking the cabling in the car and discovered that my battery power cable had begun to corrode. Thinking that we may need to replace the cabling in the car, we began calling around to obtain price estimates. Dealership wanted over 2k but our local mechanic asked us to bring it in to look at the cabling before we took the step to replace. They looked at it and advised that they would like to clean the cable and see if that cleared up the issue. They only charged me $45 and had the car back to me within hours. It is now over a month later and have not had any more stalling issues. Have you had any batteries replaced recently or have you possibly checked for cable corrosion?