GM Online Checksum Calculator

This online checksum calculator allows you to correct the checksum for GM calibration file modification, which can be used with the GM DPS software tool to program the modules.

To begin, follow these three steps:

1. 1. Select the original file to determine the calculation method (Big Endian or Little Endian, 16-bit only).
2. 2. Next, choose the second file for which you need to correct the checksum.
3. 3. Finally, download your file with the corrected checksum.

**Important**

• 1. Both files must be unzipped before use.
• 2. The first file should be the original version of the second file.
• 3. If the checksum in the first file is incorrect, the checksum for the second file cannot be corrected.