What causes a SPN 3254 code?

SPN 3254 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 3254 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3254 active.

How do I fix SPN 3254?

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 3254

Aftertreatment 1 Exhaust Gas Temperature High

What it means

The Engine Control Module detects that the exhaust gas temperature at the inlet of the Diesel Particulate Filter (DPF) has exceeded the maximum operating threshold.