Car doesn't start anymore

Had to replace speedometer cluster because the check engine light burned out on the old one, now the light works but car runs for 1 second and dies like the immobilizer is on, I tried unlocking the door with the key and same thing happens.
i disconnected the negative wire on the battery about an hour ago, will that fix the issue? I have the battery disconnected to reset the TCM because I do not have a vag-com, my OBD 2 scanner has a section for transmission and I di derase the codes but want to be sure it is wiped out.