What causes a SPN 601 code?

SPN 601 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 601 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 601 active.

How do I fix SPN 601?

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 601

J1939 SPN 601 — Engine Management parameter

What it means

SPN 601 indicates a 'Message Offsets' or configuration error within the J1939 datalink communication, specifically related to how the Engine Management system reads parameter data.