CVN Mercedes MDG1 — checksum recalculation
Recalculation of CVN and auto-fix of all CRC / ADD checksums for Mercedes MDG1 ECUs (Infineon TriCore and Freescale PowerPC). Stage 1, Stage 2, DPF off, EGR off, AdBlue off — any calibration changes.
FULL dump firmware (8 or 7.75 MB) — bench read, boot-mode or OBD full read.
Virtual OBD dumps and export of MAPS — they do not contain the CVN service sections.
Supported blocks Mercedes
Choose your block — a page opens with CVN recalculation and the full list of compatible vehicles.
| ECU Block | Makes | Cars | Processor | |
|---|---|---|---|---|
| MD1CP001 | Mercedes-Benz | 68 vehicles | PowerPC | |
| MG1CP002 | Mercedes-Benz | 16 vehicles | PowerPC | |
| MD1CS006 | Mercedes-Benz | 9 vehicles | TriCore TC298 |
Frequently asked questions
What is CVN?
CVN (Calibration Verification Number) is a 32-bit hash that the ECU computes from its calibration data. Diagnostics and OEM scanners read this number to verify the firmware against a reference signature. After tuning the CVN no longer matches the original — readiness monitors may fail and scanners may flag the unit as 'modified'.
What does this calculator do?
The tool restores the CVN of the modified Mercedes MDG1 firmware so it matches the original, and automatically recalculates all CRC / ADD checksums (passes before and after the CVN) so the file is ready to flash.
Supported platforms
Mercedes MDG1 — Infineon TriCore and Freescale PowerPC. The platform is detected automatically; there is no need to specify the CPU manually. The supported blocks are listed in the table above.
Typical use cases
- Stage 1 / Stage 2 — restore CVN before re-flashing
- DPF / EGR off and calibration edits
- Rev-limiter patches / launch control
- Any calibration changes that break emissions readiness
What is the difference between a FULL dump and an OBD virtual dump?
A FULL dump is a complete copy of the ECU memory (8 or 7.75 MB), read via bench, boot-mode or OBD full read. It contains all the service sections needed for CVN. A virtual OBD dump is a snapshot of the calibration only — those sections are absent, so recalculation is not possible.
Is the original (ORI) required or is the modified file enough?
Both files are required: the original (ORI) and the modified file (MOD) of the same firmware version. The tool compares them, finds the affected regions and recalculates only the needed checksums without touching the rest of the calibration.
Why does the scanner show the ECU as 'modified'?
Diagnostics compares the current CVN against the factory reference signature. After tuning the calibration changes and the CVN differs — the scanner flags the unit as modified and readiness checks may fail. CVN recalculation fixes this for the ECU itself (we do not affect the OEM reference database).
How much does the recalculation cost and how long does it take?
CVN preview is free: upload ORI and MOD and see the values in seconds. Applying the fix (ready-to-flash file) — in the portal for 50 credits. The calculation itself takes a few seconds; there is no queue.
Is this safe for the ECU?
Yes. The tool changes only the checksums and the CVN correction slot, leaving all logic and calibration untouched. ORI and MOD files are not stored on the server — only calculation metadata is written to the log.