ECU checksum correction is an optional add-on service that recalculates and updates the integrity values inside the ECU file after tuning. It ensures the modified file is accepted by the ECU without errors or unexpected limp-mode.

ECU Checksum Correction Service

Ecu Checksum Correction Diagram

A checksum is a mathematical integrity value stored inside the ECU firmware. Whenever you modify maps (fuel, torque, boost, DTC, DPF/EGR/AdBlue off, etc.), the checksum must be recalculated and updated. If not, the ECU may reject the write, enter limp mode or simply not start after flashing.

Important: checksum correction is a separate, optional service. If your flasher does not reliably fix checksums, or you prefer a pre-verified file, add the
Checksum Correction add-on at checkout and receive a validated file ready to flash.
Low-quality clone devices often apply incomplete or wrong checksum logic (wrong regions, polynomial/endianness, or missing EEPROM), which can cause failed writes or even a bricked ECU.

Supported ECU Families – Detailed Coverage

Complete coverage of ECU families supported by TuningBot’s checksum correction service.
ManufacturerSupported ECU FamiliesArchitecture / MCUTypical Vehicle Brands
Bosch (MDG1 / MG1 / MD1)MD1CS001, MD1CS002, MD1CS003, MD1CP002, MD1CP004, MD1CP006, MD1CP007, MG1CS001, MG1CS002, MG1CS011, MG1CS016, MG1CS111, MG1CS261, MD1CE100, MD1CE101Infineon Tricore TC298 / TC299 / TC275 / TC277VW, Audi, BMW, Mercedes, Porsche, Ford, PSA, Volvo, Opel, Fiat
Bosch (EDC17 / MED17 / ME17)EDC17CP04, EDC17CP14, EDC17CP20, EDC17CP22, EDC17CP44, EDC17CP48, EDC17C46, EDC17C49, EDC17C64, EDC17CV41, EDC17CV54, MED17.1, MED17.1.1, MED17.3, MED17.5, MED17.5.21, MED17.7, ME17.5, ME17.9.8Infineon Tricore TC1766 / TC1796 / TC1797 / TC1793 / TC1767VW, Audi, BMW, Mercedes, PSA, Ford, Opel, Porsche, Volvo, FCA, GM
Magneti Marelli (Full Family)IAW 4LV, IAW 4MV, IAW 4EF, IAW 4SF, IAW 5AM, IAW 5AF, IAW 7GF, IAW 7SM, MJ8DF, MJ9DF, MM6LP, MM6LP2, MJD6F3, MJD8F2, MJD8DF, MJD10F3, MM8GF, MM8GM, MM8GV, MM10JAST10F275 / MPC555 / MPC561Fiat, Alfa Romeo, Lancia, Jeep, Abarth, Iveco
Siemens / Continental (SID / SIMOS / PCR / EMS)SID201, SID203, SID204, SID206, SID208, SID209, SID211, SID807, SID807EVO, SID801, SID803, SID804, SID902, SID903, SID904, SID906, SIMOS 8.x, SIMOS 10.x, SIMOS 11.x, SIMOS 12.x, SIMOS 16, SIMOS 18, PCR2.1, EMS2.x, EMS3.xRenesas SH705x / SH725xx / Infineon TricoreVW, Audi, Skoda, Seat, Renault, Volvo, Ford, Kia, Hyundai, Peugeot, Citroën
Delphi (Full Family)DCM3.2, DCM3.3, DCM3.4, DCM3.5, DCM3.7, DCM6.2, DCM6.3, DCM6.4, MT05, MT10, MT22.1, MT22.2, MT32, MT38, MT60, MT80, MT86, MT90, MT92, MT240MPC55xx / MPC56xx / TricoreRenault, Nissan, Mercedes, Ford, PSA, Hyundai, Kia, GM, Opel, trucks
Opel / GM Delco (E-series)Delco E37, E39, E67, E69, E78, E80, E82, E83, E87, E92, E98, E99Freescale MPC55xx / MPC56xxOpel, Chevrolet, Buick, Cadillac, Holden
Denso (16-bit / 32-bit)175822, MB275800, SH7055, SH7058, SH7059, SH72531, SH72543, SH72546Renesas SH705x / SH725xToyota, Mazda, Subaru, Ford, Suzuki
Transtron (Isuzu / Hino)Transtron 4JJ1, 4HK1, 4HE1 familiesRenesas SH725xx 32-bitIsuzu, Hino
TRW (Volvo Trucks)EMS2, EMS2.2, EMS2.3, ACM (Aftertreatment Control Module)MPC561 / MPC555 / MPC5566Volvo Trucks, Renault Trucks, Mack

About ECU checksum (quick technical notes)

  • When it’s required: after map changes, cloning/immo off, OS or segment swaps, EEPROM edits.
  • Common issues with bad checksum: write aborted, no-start, fan always on, MIL on, limp mode.
  • Where it applies: main flash and often EEPROM (Bosch MED/EDC17, MD1/MG1; Marelli IAW/MJD; Delphi DCM/MT; Siemens/Continental SID/SIMOS/EMS; Denso/Transtron; TRW).

Best practice: always validate checksums before flashing. If you are unsure, add the
Checksum Correction add-on and we will return a pre-verified file ready to write.

Other ECUs currently covered by our checksum service

This legacy list shows additional ECUs supported by our checksum engine. All of them can be handled as an optional service when you purchase a tuning file.

Coverage is updated frequently. If your ECU is not listed, contact support and include your flash/EEPROM readout.