What causes a SPN 825 code?

SPN 825 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 825 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 825 active.

How do I fix SPN 825?

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 825

J1939 SPN 825 — Engine Management parameter

What it means

SPN 825 indicates a 'Calibration Error' or 'Parameter Error' within the Engine Control Module (ECM/ECU). It signifies that the internal stored parameters or configuration data are corrupted or invalid.