What causes a SPN 3103 code?

SPN 3103 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 3103 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3103 active.

How do I fix SPN 3103?

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 3103

J1939 SPN 3103 — Body/Chassis parameter

What it means

Proprietary Body Controller Parameter. This is a generic J1939 slot used by OEMs (like Freightliner, Kenworth, or Peterbilt) to report status or errors from body-specific modules.