Retirement tax questions

Thanks so much for your help. You are correct. I have not received my W-2  yet but I have a record of my contributions so I entered it into Turbo Tax. I used Code D in box 12a ((Elective deferrals to a section401(k)) and checked the box identified as "Retirement plan" in box 13. This is how I have handled it in prior years without any problems but, apparently it was never over that lower limit. I will wait for the download of my W-2, but I would appreciate any comments you may have regarding how I entered the info.