Knowledgebase: Support > VCM Suite
X7F Negative Response Code
The x7f Negative Response Code generally indicates an issue with the communications in the vehicle.

If you have the ability, we would first suggest using a bench harness to read or flash the module in the vehicle.

If you do not have the ability to use a bench harness or the problem persists, please start a Support ticket and send us the following:

1) VCM Suite Infolog while connected to the vehicle
2) Debug file from your PC located in ...Documents/ HP Tuners/ Settings
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