The generator matrix

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

generates a code of length 17 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 12.

Homogenous weight enumerator: w(x)=1x^0+442x^12+2076x^13+8188x^14+25960x^15+56811x^16+74856x^17+57144x^18+26304x^19+8022x^20+1820x^21+428x^22+56x^23+36x^24

The gray image is a code over GF(2) with n=136, k=18 and d=48.
This code was found by Heurico 1.16 in 91.8 seconds.