What causes a SPN 7826 code?

SPN 7826 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a SPN 7826 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 7826 active.

How do I fix SPN 7826?

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

J1939 SPN

SPN 7826

Cummins fault code 7826

What it means

Aftertreatment (NOx) Sensor Data - Abnormally Update Rate. The ECM has lost communication with one or both NOx sensors via the dedicated aftertreatment CAN bus.