No accepted flash without correct checksums
Why checksums break
Any edit to a map changes the file's contents, so the stored integrity values no longer match.
Automatic recalculation
Map Decoder recalculates the correct checksums during patch generation — no separate plugin.
Across ECU families
Supports the checksum systems used by Bosch, Continental, Delphi, Siemens, Denso and Valeo ECUs.
Checksum correction — frequently asked questions
What is checksum correction?
After an ECU map is modified, the file's checksums no longer match its contents and the ECU may reject the flash. Checksum correction recalculates these values so the modified file is accepted.
Is checksum correction automatic in Map Decoder?
Yes. Checksum correction is applied automatically as part of patch generation, so you do not need a separate plugin or manual step.
Which checksum systems are supported?
Map Decoder handles the checksum systems used by the supported Bosch, Continental, Delphi, Siemens, Denso and Valeo ECU families.
What happens if the checksum is wrong?
If the checksum does not match the contents, the ECU may refuse to flash the file or behave unpredictably. Correct checksums are essential for a safe, accepted flash.
Every patch, checksum-corrected
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