11/10/2020 Page 6 of 30 Cummins Tier 4 Fault Codes Fault Code J1939 SPN J1939 FMI 1552 1553 1554 1555 1556 1557 1621 1622 1654 1655 1656 1657 1658 1659 1664 661 662 663 664 665 666 1387 659 1323 1324 1325 1326 1327 1328 4796 5 5 5 5 5 5 4 5 31 31 31 31 31 31 31 1668 ...