Replacement ECM for Cruze Sonic Trax Equinox Terrain VanderhallReplacement ECM for Cruze Sonic Trax I will need a picture of the back of your ECM and your V. I. N. from your car. You keep your old ECM no core charge required. You ask why did I add replacement ECMs to the website? Well this was a simple decision to make. I diagnose so many cars I have seen a few to many cars after months of diagnosing end up having a bad ECM. Then after realizing the ECM is a culprit my customer has no way of getting the ECM fixed