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MasterTune stops during uploading (saving) or programming with an error -502. What is the problem?

April 26, 2017Error mastertune problem Programming Saving Stops

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MasterTune stops during uploading (saving) or programming with an error -502. What is the problem?

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This is due to corrupted communications on the ECM diagnostic bus. This can occur if third-party devices connected to the bus or ECM (such as a Power Commander or aftermarket gauges). Disconnect any such devices and retry the operation.