What's that code? Know before you go.
Look up OBD-II check engine codes and Cummins diesel fault codes in plain English. Every code comes with green, yellow and red examples, so you know whether it can wait, needs a repair soon, or means pull over now.
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
OBD-II check engine codes
151 of the most common P, U and diesel codes for cars, pickups and vans, from P0300 misfires to P20EE DEF codes.
Browse OBD-II codesCummins fault codes
962 Cummins codes with J1939 SPN and FMI, lamp severity and causes, from 3714 derates to 1922 DPF pressure.
Browse Cummins codesFault code questions
What's the difference between OBD-II codes and Cummins fault codes?
OBD-II codes (like P0420) are the five-character codes every car and light truck since 1996 uses, read with any basic scan tool. Cummins fault codes (like 3714) are numbers Cummins assigns to J1939 SPN and FMI combinations, shown by Cummins software and on medium and heavy-duty dashes.
Does a code tell me which part to replace?
No. A code tells you which system saw a problem and what kind. The cause could be the part, its wiring, or something upstream. That's why the same code can be a five-minute fix or a big repair.
Is it safe to drive with the check engine light on?
A steady check engine light usually means get it checked soon. A flashing light means a severe misfire. Slow down and stop driving as soon as you can. Any red stop lamp on a diesel means shut it down when it's safe.
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