The generator matrix

 1  1  1  1  1  1  1
 0 12  0  4  0  0  0
 0  0 12  4  0  0  0
 0  0  0  8  0  0  0
 0  0  0  0  8  0  0
 0  0  0  0  0  8  0
 0  0  0  0  0  0  8

generates a code of length 7 over Z16 who´s minimum homogenous weight is 2.

Homogenous weight enumerator: w(x)=1x^0+19x^2+81x^4+96x^5+155x^6+3392x^7+155x^8+96x^9+81x^10+19x^12+1x^14

The gray image is a code over GF(2) with n=56, k=12 and d=8.
This code was found by Heurico 1.16 in 0.0025 seconds.