Knowledgebase: Support
X7F Negative Response Code
The x7f Negative Response Code is almost always related to an issue with the vehicle's battery or wiring.

I would suggest trying the following:
1) Ensure the battery is fully charged before reading or writing to it
2) Inspect the vehicle's wiring for any issues
3) If you have any aftermarket electronics, either uninstall them or remove their fuses
4) Remove fuses for any entertainment/infotainment systems

If you try all the above and still have this issue please send us the following:
1) VCM Suite Infolog while connected to the vehicle as shown here
) Debug file from your PC. This is located in ...Documents/ HP Tuners/ Settings
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