What causes a SPN 3927 code?

SPN 3927 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 3927 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3927 active.

How do I fix SPN 3927?

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 3927

J1939 SPN 3927 — Body/Chassis parameter

What it means

SPN 3927 indicates a configuration or parameter mismatch related to the Body/Chassis system. It often triggers when the vehicle's control modules do not agree on software settings or when a body-builder interface is sending data that contradicts the chassis configuration.