The generator matrix

 1  1  X
 0  X X+2
 0  0  2

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

Homogenous weight enumerator: w(x)=1x^0+23x^2+16x^3+23x^4+1x^6

The gray image is a code over GF(2) with n=12, k=6 and d=4.
This code was found by Heurico 1.16 in 3e-005 seconds.