The generator matrix

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

generates a code of length 18 over Z4[X]/(X^3+2,2X) who´s minimum homogenous weight is 15.

Homogenous weight enumerator: w(x)=1x^0+160x^15+542x^16+752x^17+1237x^18+736x^19+506x^20+112x^21+10x^22+32x^23+7x^24+1x^26

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 0.094 seconds.