What causes a SPN 3111 code?

SPN 3111 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 3111 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3111 active.

How do I fix SPN 3111?

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 3111

J1939 SPN 3111 — Body/Chassis parameter

What it means

SPN 3111 pertains to Body/Chassis Parameter Data. This is a generic network parameter code indicating that specific body-builder or chassis-related data required by the vehicle control system is missing, invalid, or out of range.