The generator matrix

 1  1  1  1  1  1  2  0  1  1  1  2  0  1  2  8  4  2
 0  2  0  6  0  6 14  2  2 10  8  6  2 10 14  0  4 14
 0  0 12  0  0  0  0  0  0  0 12 12 12  8  8  8  4  4
 0  0  0 12  0  0  4  4  8  4  0  8  8  0 12  8  0  4
 0  0  0  0 12  0 12  8 12  4 12  4  0  4  0  4 12  4
 0  0  0  0  0 12 12 12  8  8  4  0  4 12  8  4 12  0

generates a code of length 18 over Z16 who´s minimum homogenous weight is 12.

Homogenous weight enumerator: w(x)=1x^0+204x^12+104x^13+1022x^14+1400x^15+4167x^16+5712x^17+7526x^18+5552x^19+4430x^20+1480x^21+890x^22+88x^23+152x^24+34x^26+6x^28

The gray image is a code over GF(2) with n=144, k=15 and d=48.
This code was found by Heurico 1.16 in 3.24 seconds.