The generator matrix

 1  1  1  1  1  1  1  1  X  X 2X+2  X  1  1  1  1
 0  X  0  X 2X  0 X+2 3X+2  2  X  X 2X+2 2X+2 X+2  2  0
 0  0  X  X  0 3X+2 X+2 2X  X X+2  2 3X+2  2 3X 3X+2  0
 0  0  0  2 2X+2  2 2X  2  0  2  2  2  2  2 2X 2X

generates a code of length 16 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 12.

Homogenous weight enumerator: w(x)=1x^0+49x^12+212x^13+310x^14+864x^15+1222x^16+912x^17+272x^18+176x^19+55x^20+12x^21+10x^22+1x^24

The gray image is a code over GF(2) with n=128, k=12 and d=48.
This code was found by Heurico 1.16 in 0.047 seconds.