What causes a SPN 3873 code?

SPN 3873 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 3873 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3873 active.

How do I fix SPN 3873?

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 3873

J1939 SPN 3873 — Body/Chassis parameter

What it means

J1939 Body/Chassis parameter fault indicates a mismatch or loss of communication regarding vehicle configuration data sent between the body controller and the engine/chassis modules.