Join Date: May 2011
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Originally Posted by Cobb Tuning
Q. Can a dealer detect that I have an AccessPORT installed?
A. Yes, this is possible unless you use the [Revert to Stock] menu option to load a purely stock program on the ECU. While the vehicle can be serviced by the dealership in the same way as a stock vehicle, and all the Dealer scan tools function 100% the same, the data on the ECU has a marker known as a "checksum". Whenever any data on the ECU is changed, this checksum value must be changed in order for the ECU to operate. If a dealership compares this checksum value against another stock car, the values will be different. If you use the [Revert to Stock] menu option to uninstall the AccessPORT from your vehicle, the checksum on the ECU is now a valid stock checksum. No markers are left by the AccessPORT when using the [Revert to Stock] menu option.
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