What causes a SPN 6811 code?

SPN 6811 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 6811 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 6811 active.

How do I fix SPN 6811?

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 6811

Cummins fault code 6811

What it means

Primary Engine Device - Configuration Error. This code indicates that the engine control module (ECM) has detected a configuration mismatch or an incorrect parameter setting related to the engine or aftertreatment control system.