The generator matrix

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

generates a code of length 18 over Z4[X]/(X^2+2X+2) who´s minimum homogenous weight is 15.

Homogenous weight enumerator: w(x)=1x^0+136x^15+459x^16+912x^17+1280x^18+656x^19+412x^20+208x^21+16x^22+8x^23+8x^24

The gray image is a code over GF(2) with n=144, k=12 and d=60.
This code was found by Heurico 1.16 in 0.031 seconds.