What causes a SPN 574 code?

SPN 574 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 574 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 574 active.

How do I fix SPN 574?

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 574

J1939 SPN 574 — Engine Management parameter

What it means

Transmission Output Shaft Speed - Data Erratic/Incorrect. This code indicates the ECM is receiving a vehicle speed signal that does not match its expected parameters or is missing from the J1939 data link.