What causes a SPN 952 code?

SPN 952 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 952 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 952 active.

How do I fix SPN 952?

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 952

J1939 SPN 952 — Engine Management parameter

What it means

SPN 952 indicates an issue with the Engine Management Parameter. This is typically a software-level fault where the ECM detects that a specific operating parameter is missing, corrupted, or out of range compared to the expected configuration.