The generator matrix

 1  1  2  1
 0  2  2  0
 0  0  4  0

generates a code of length 4 over Z8 who´s minimum homogenous weight is 2.

Homogenous weight enumerator: w(x)=1x^0+6x^2+16x^3+18x^4+16x^5+6x^6+1x^8

The gray image is a code over GF(2) with n=16, k=6 and d=4.
This code was found by Heurico 1.16 in 5.79e-005 seconds.