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Knowledgebase: Support > VCM Editor
Reader Upload Request :x7F Negative response code error
If you receive the "Reader Upload Request :x7F Negative response code" error, this indicates your vehicle has likely been previously tuned and the ability to read the tune has been disabled. 

Please start a Support ticket and send the following for further assistance:

1) VCM Suite Infolog while connected to the vehicle as shown here: https://forum.hptuners.com/showthread.php?34789-What-is-a-VCM-Suite-infolog-and-why-is-it-so-Important-when-contacting-support
2) Debug.dat file from your PC. This is located in ...Documents\ HP Tuners\ Settings

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