I was on my way to work last week and right when I went over a set of railroad tracks my service engine soon light came on. I pulled the code and it was pcm 0139. It turned off the next day, but came back on a day later at the same set of railroad tracks on my way to work. It turned off again, but now I'm wondering what that meant. I'm new to this site and am curious if anyone has any suggestions. Any help would be greatly appreciated.