The generator matrix

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

generates a code of length 6 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 4.

Homogenous weight enumerator: w(x)=1x^0+9x^4+34x^5+173x^6+28x^7+6x^8+2x^9+3x^10

The gray image is a code over GF(2) with n=48, k=8 and d=16.
This code was found by Heurico 1.16 in 0 seconds.