What causes a SPN 3671 code?

SPN 3671 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 3671 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3671 active.

How do I fix SPN 3671?

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 3671

J1939 SPN 3671 — Body/Chassis parameter

What it means

Engine Protection Configuration Error / Body Controller Parameter Conflict. Specifically, this code indicates the ECM is receiving invalid or missing data regarding engine protection limits or body-specific operating parameters via the J1939 data link.