What causes a SPN 2648 code?

SPN 2648 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 2648 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 2648 active.

How do I fix SPN 2648?

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 2648

J1939 SPN 2648 — Aftertreatment/Emissions parameter

What it means

Diesel Oxidation Catalyst (DOC) Inlet Temperature high. The exhaust gas entering the DOC is exceeding safe operating limits.