What causes a SPN 3331 code?

SPN 3331 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 3331 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3331 active.

How do I fix SPN 3331?

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 3331

J1939 SPN 3331 — Body/Chassis parameter

What it means

SPN 3331 indicates a fault or data mismatch related to a Body/Chassis parameter being transmitted over the J1939 data link. It typically implies the ECM is receiving invalid data or has lost communication with a specific body integration module.