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Message:: [QUOTE="camceldealer64, post: 11688984, member: 326349"]Root Cause: <ul> <li>DEF header replacement parts are not available and DEF header part shortages have necessitated the release of an ECM calibration code revision that reduces engine torque and vehicle speed limits levels to allow for continued operation of the vehicle until a DEF header is available for final repair.</li> </ul>Verification <ul> <li>Verify one or all DEF header datalink Fault Codes 3868, 4572 and/or 4677 are logged.</li> <li>Verify published troubleshooting has been completed.</li> <li>Verify DEF header part is not available for the repair.</li> </ul>Resolution <ul> <li>Because of the lack of DEF header part availability, new ECM calibration codes are being made available that reduces the inducement levels when DEF header datalink communication faults are detected.</li> <li>Downloading this ECM calibration code must be filed in accordance with one of the appropriate TRPs. See TRP2484 or TRP2489 for further details.<ul> <li>TRP2489 – qualified engines installed in Navistar® chassis</li> <li>TRP2484 – qualified engines installed in all other chassis</li> </ul></li> <li>Unauthorized download of this ECM calibration code is considered tampering of emission control devices on Cummins products. Cummins Inc. prohibits tampering of emissions control devices on Cummins® products in any capacity. Reference Warranty Memo 1633 for additional details. See link below.</li> </ul>[/QUOTE]