What causes a SPN 3252 code?

SPN 3252 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 3252 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3252 active.

How do I fix SPN 3252?

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.

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J1939 SPN

SPN 3252

DPF Outlet Temperature High (SPN 3252)

What it means

Indicates that the exhaust gas temperature at the outlet of the Diesel Particulate Filter has exceeded the safety threshold.

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