DEF header override- ECM calibration
Fault codes: 3868, 4677,4572 Cummins ecm calibration temporarily allows for truck operation with malfunctioning DEF header to accommodate customers while parts are on back order. Temporarily bypass DEF header fault codes by using this calibration technique. Freightliner, International, Kenworth, Peterbilt, Cummins - derate and DEF gauge flashing.
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