The DM17 code is the one to address first as it is a DATA EXCHANGE FAULT. If the ecm is not communicating with the right side, it will cause the DM7 code. All these codes require shop diagnostic equipment for pin point test procedures unfortunately. Once communication is reestablished, the DM7 will more than likely be resolved.
Post back with any further questions.
Thank you. When is states 'RIGHT' side... does it mean as viewed from the driver seat or standing in front of car facing the engine? Where might the ECM be located and what does it look like?