What causes a SPN 500 code?

SPN 500 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 500 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 500 active.

How do I fix SPN 500?

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 500

J1939 SPN 500 — Engine Management parameter

What it means

SPN 500 indicates a fault with the Vehicle Speed sensor signal. The Engine Control Module (ECM) is receiving an erratic, implausible, or missing speed signal, which is critical for cruise control, engine governing, and transmission shifting.