What is it
Checksum Corrector is a lightweight utility that recalculates and repairs checksums in ECU binaries after editing maps. Load your BIN/HEX, choose the matching driver from the built-in module list, check and save a corrected file ready to write back with your preferred flasher/programmer.



Why it matters
After tuning or repairing an ECU dump, the internal checksum must match the expected value. If it doesn’t, the control unit can reject the file, set DTCs or fail to start. This tool automates checksum calculation for a wide set of gasoline and diesel ECUs across European, US and Asian brands.

Workflow
Open file → select the correct module (“Installed Drives”) → Check → Save. Always keep an original backup and verify on bench/vehicle before road use.

Supported modules (with brief notes)

• Ford ECV V 28F200 — Ford ECUs using AMD 28F200 flash.
• MCC Smart Euro3–Euro4 — Smart Fortwo gasoline/diesel ECUs (Euro 3/4).
• Volvo ME7 — Bosch ME7 Volvo petrol management.
• Volvo Common Rail V2 — Diesel CR families for Volvo.
• VAG CR 4.21 — 2002 — Early VAG common-rail checksum set.
• VAG ME7 Version 2 — Bosch ME7.x for VW/Audi generation 2.
• VAG ME7 Version 3 (2002) — Bosch ME7.x late variants.
• Opel 17 SDTI — Opel/GM 1.7 SDTI diesel ECUs.
• Renault/Peugeot/Citroën ME7 — Bosch ME7 used on PSA/Renault petrol.
• Audi V8 CR2 — Audi V8 common-rail diesel set.
• Common Rail Version 1 — Generic CR checksum pack (early).
• Common Rail Version 2 — Generic CR checksum pack (extended).
• VAG CR Version 4.1 — VW/Audi CR update pack.
• Bosch EDG15C Smart CDI — Smart CDI (EDG15C) diesel.
• BMW Common Rail V2 — BMW diesel common-rail families.
• Nissan Common Rail V2 — Nissan diesel CR ECUs.
• Bosch TDI V3.1 — Bosch diesel TDI checksum set (V3.1).
• Siemens Volvo MS — Siemens MS for Volvo petrol.
• Common Rail Version 3 — Generic CR pack (latest).
• BMW Siemens MS42 — BMW M52TU petrol ECU.
• BMW Siemens MS43 — BMW M54 petrol ECU.
• Siemens Citroën/Peugeot HDi — PSA HDi diesel ECUs (Siemens).
• Siemens Renault RE55 — Renault Siemens RE55 petrol/diesel.
• Mercedes Siemens 5WK9 — Mercedes ECUs with 5WK9 designation.
• Alfa ME7 Euro3 — Bosch ME7 for Alfa Romeo Euro 3.
• Fiat Bosch ME7 Euro2–Euro3 — Bosch ME7 for Fiat Euro 2/3.
• Delphi DCI — Delphi diesel common-rail (DCI) families.
• Opel Simtec 56 — Siemens/Opel Simtec 56 petrol.
• Bosch 8-Bit Checksum — Generic 8-bit Bosch checksum routine.
• GM Delco Multec — GM/Delco Multec gasoline ECUs.
• Siemens Mini MS — MINI Siemens MS petrol.
• Temic V52–V59 — Temic ECU series V52 to V59.
• BMW EDC16 Diesel — Bosch EDC16 for BMW diesels.
• Opel Bosch MEXX — Opel Bosch ME variants (MExx).
• Opel Bosch M1.5.5 — Bosch M1.5.5 petrol for Opel/GM.
• Opel Siemens Simtec 70–90 — Simtec 70/71/75/90 families.
• Ferrari F360 Modena ME7.3 — Bosch ME7.3 Ferrari 360.
• Bosch EDC16C8 CR V5 — EDC16C8 diesel CR ver. 5.
• Chrysler CR Ver 2.0 — Chrysler diesel common-rail pack.
• Porsche Bosch ME7.8 — Porsche 996/997/986 ME7.8.
• Bosch Valvetronic ME9 — BMW Valvetronic (ME9.x).
• Citroën Delphi DCI — Delphi diesel for Citroën.
• BMW Siemens MSS52 — BMW M5 E39/M3 E46 performance ECU.
• Maserati ME7.3.1 — Bosch ME7.3.1 Maserati.
• Alfa JTS MED7.1.1 — Bosch MED7.1.1 direct injection for Alfa JTS.
• VAG Pump Injector — VW/Audi PD (pumpe-düse) diesel checksum routines.
• Audi M3.X / M5.X — Magneti Marelli M3.x/M5.x for Audi.
• Siemens 5WP4 — Siemens 5WP4 family.
• BMW Bosch ME7 — BMW petrol Bosch ME7.
• Siemens Ford — NO DCI — Ford Siemens petrol (non-DCI).
• Checksum Marelli — Magneti Marelli generic corrections.
• Mazda Nippon Denso — Mazda ECUs with Nippon Denso.
• MCC Smart Euro4 — ECU 006 — Smart Fortwo Euro 4 specific (ECU 006).
• Bosch BMW M5.2 — Bosch M5.2 petrol for BMW.
• Bosch DME Checksum — Generic BMW Bosch DME corrections.
• Bosch AS41 — Bosch AS41 family routine.

Compatibility

• Works with any flasher/programmer that reads/writes BIN/HEX (K-TAG, BDM, boot-mode, OBD tools, bench programmers, etc.).
• Suitable for engine and some transmission ECUs listed above.

Operating system

• Windows (desktop) — lightweight, no installation complexity.

Minimum system requirements

• CPU: 1.0 GHz or better
• RAM: 1 GB+
• Storage: 50 MB free
• Display: 1024×768 or higher

Best practices

• Always read and save the original file; verify checksum after writing.
• Match the driver to the exact ECU family; when in doubt, identify with part number/flash type.
• Bench-test after programming before returning the vehicle.

Source of files & responsibility
Source of Files: All software and resources provided in this post were collected from public, open-source locations on the internet. We do not claim to be the original authors or developers.
• File Hosting: This forum does not host files. All download links point to third-party, publicly available cloud services. We are not responsible for external content.
• User Responsibility: Provided for educational and evaluation purposes only. You assume all risk for use. The authors of this post and forum administration are not liable for any damage to equipment or data.