The generator matrix

 1  0  1  1  1  1  1  1  1  X  1  1  1  1 a*X  1  1  1  1 a^2*X  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  0  X a*X a^2*X  1  1  1  1  1  1  1  1
 0  1 a^2*X+1  a a^2*X+a^2  X a*X+1 X+a a*X+a^2  1 a*X X+1 a*X+a X+a^2  1 a^2*X  1 a^2*X+a a^2  1  0 a^2*X+1  X a*X+1  a X+a a*X X+1 a*X+a a^2*X+a^2 a*X+a^2 X+a^2 a^2*X  1 a^2*X+a a^2  1  1  1  1  0  X a*X a^2*X a^2*X+1 a*X+1 X+1  1

generates a code of length 48 over F4[X]/(X^2) who´s minimum homogenous weight is 144.

Homogenous weight enumerator: w(x)=1x^0+246x^144+9x^160

The gray image is a linear code over GF(4) with n=192, k=4 and d=144.
As d=144 is an upper bound for linear (192,4,4)-codes, this code is optimal over F4[X]/(X^2) for dimension 4.
This code was found by Heurico 1.16 in -1.01e-007 seconds.