What causes a SPN 3243 code?

SPN 3243 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 3243 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3243 active.

How do I fix SPN 3243?

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 3243

SPN 3243 Aftertreatment DPF Regeneration Aborted

What it means

Indicates that an active diesel particulate filter (DPF) regeneration was initiated but could not be completed successfully due to system performance or sensor feedback.