No. Back pain is not a sign of diabetes.
The signs of diabetes are the four Ts: thirst, toilet, tiredness, thinness.
Your avatar says you are type 1, but this thread - https://www.diabetes.co.uk/forum/threads/came-to-uk-and-recognized-that-i-m-10-in-1.136288/page-2#post-1742553 - confirms you...