What causes a SPN 3284 code?

SPN 3284 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 3284 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3284 active.

How do I fix SPN 3284?

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 3284

J1939 SPN 3284 — Body/Chassis parameter

What it means

The SPN 3284 indicates an abnormal update rate or invalid data from the Body/Chassis controller on the J1939 data link. This typically refers to the interface between the truck chassis and vocational body equipment (e.g., dump beds, mixers, or cranes).