What causes a SPN 953 code?

SPN 953 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 953 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 953 active.

How do I fix SPN 953?

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 953

J1939 SPN 953 — Engine Management parameter

What it means

Diesel Particulate Filter (DPF) Differential Pressure. This code indicates that the engine controller has detected an abnormal pressure difference across the DPF.