What causes a SPN 3667 code?

SPN 3667 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 3667 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3667 active.

How do I fix SPN 3667?

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 3667

J1939 SPN 3667 — Body/Chassis parameter

What it means

The SPN 3667 code is a generic body/chassis parameter fault typically associated with an invalid or missing signal from an auxiliary operator input, such as a multi-switch, joystick, or body-builder interface module.