The generator matrix

 1  0  0  1  1  1 14  8
 0  1  0  1 12 13  1  2
 0  0  1  1  0  3  2  1
 0  0  0  2  6  4  6  6

generates a code of length 8 over Z16 who´s minimum homogenous weight is 5.

Homogenous weight enumerator: w(x)=1x^0+416x^5+1264x^6+7520x^7+14366x^8+7520x^9+1264x^10+416x^11+1x^16

The gray image is a code over GF(2) with n=64, k=15 and d=20.
This code was found by Heurico 1.16 in 71.4 seconds.