The generator matrix

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

generates a code of length 15 over Z4[X]/(X^2+2,2X) who´s minimum homogenous weight is 12.

Homogenous weight enumerator: w(x)=1x^0+91x^12+24x^13+108x^14+80x^15+97x^16+24x^17+72x^18+11x^20+4x^22

The gray image is a code over GF(2) with n=60, k=9 and d=24.
This code was found by Heurico 1.16 in 0.0504 seconds.