What causes a SPN 4669 code?

SPN 4669 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 4669 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 4669 active.

How do I fix SPN 4669?

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 4669

Cummins fault code 4669

What it means

Particulate Trap Active Regeneration Inhibited Due to System Timeout. This occurs when the aftertreatment system cannot complete a regeneration to lower the soot load within the allotted time.