NHTSA Service Bulletin 10227533: Cummins Cummins

This Technical Service Bulletin describes the verification and resolution to the Symptom of a combination of one or all DEF header fault code(s) 3868, 4572 and/or 4677 are logged. Note : These ECM calibrations will only address DEF header sensor malfunctions that are logging one or combination of DEF header fault code(s) 3868, 4572 and/or 4677. Engine has a DEF header malfunction and replacement is not available. Root Cause: DEF header replacement parts are not available and DEF header part shortages have necessitated the release of an ECM calibration code that allows the engine to operate normally without engine torque and vehicle speed limits until a DEF header is available for final repair. Verify one or all DEF header datalink Fault Codes 3868, 4572 and/or 4677 are logged. Verify published troubleshooting has been completed. Verify DEF header part is not available for the repair. Important: Several additional OEMs have been added to TRP2484 and may have a unique pre-authorization process. Engines installed in OEM chassis that require pre-authorization will not appear eligible on QSOL until proper steps are followed. Reference Table 1, OEM Pre-authorization Process, below. Resolution: Because of the lack of DEF header part availability, new ECM calibration codes are being made available that allows the engine to operate normally without engine torque and vehicle speed limits until a DEF header is available for final repair. Along with the download of the new ECM calibration, the OEM wiring harness at the DEF header will need to be cut at least 4 inches on the DEF header side of the wiring harness and heat shrink repaired. In some failure conditions the DEF header sensor can produce faults intermittently. The DEF header sensor must be removed electrically from the OEM harness to prevent intermittent faults as this can lead to additional warning and de-rate events. The intent of the below procedure electrically removes the DEF header sensor from the circuit.