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The 3 light code is telling you that there is a issue with the EMM. Disconnect all plugs going to it and make sure that all of the connections are clean and that there are no bent or broken pins. If all if that looks good, you will need to get in contact with
http://dfitechnologies.com/ to get the EMM repaired. You will have either a failed driver in it or a grounding issue inside the EMM,