Cummins Fault Codes
828 Cummins J1939 (SPN/FMI) fault codes, grouped by after-treatment system. Search by fault code or keyword.
Each code page shows the factual SPN/FMI meaning free. The tuning & delete guidance — which after-treatment system a code belongs to and how it behaves in a delete/off calibration — is reserved for signed-in Alt Tune dealers.
DPF
DPF (12)
Diesel Particulate Filter — soot capture, differential pressure and regeneration faults.
1664Aftertreatment 1 Diesel Oxidation Catalyst Missing - Condition ExistsModerate1691(ISB, ISC, ISL)Moderate1879Aftertreatment Diesel Particulate Filter Differential Pressure Sensor Circuit - Voltage Above Normal or Shorted to High SourceModerate1881Aftertreatment Diesel Particulate Filter Differential Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low SourceModerate1883Aftertreatment Diesel Particulate Filter Differential Pressure - Data Erratic, Intermittent, or IncorrectModerate1921Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating RangeModerate1922Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating RangeModerate1981Aftertreatment Diesel Particulate Filter System - Data Valid But Above Normal Operating Range - Least Severe LevelMinor1993Aftertreatment 1 Diesel Particulate Filter Missing - Condition ExistsModerate2637(ISB, ISC, ISL)Moderate2638(ISB, ISC, ISL)Moderate2639Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating RangeModerate
