What causes a SPN 602 code?

SPN 602 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 602 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 602 active.

How do I fix SPN 602?

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 602

J1939 SPN 602 — Engine Management parameter

What it means

SPN 602 refers to a failure in the Engine Management Parameter storage. It means the ECM has detected a checksum error or corruption in its programmed operational parameters.