What causes a SPN 3864 code?

SPN 3864 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 3864 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3864 active.

How do I fix SPN 3864?

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 3864

J1939 SPN 3864 — Body/Chassis parameter

What it means

J1939 SPN 3864 indicates a generic or specific error related to Body/Chassis parameter communication. This usually means the engine or vehicle controller is receiving data from a chassis-related sensor or body controller that is out of range, erratic, or missing.