What causes a SPN 3668 code?

SPN 3668 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 3668 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3668 active.

How do I fix SPN 3668?

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 3668

J1939 SPN 3668 — Body/Chassis parameter

What it means

SPN 3668 typically refers to a Body/Chassis data conflict or a configuration error related to the integration of the vehicle's chassis with body-builder equipment or secondary control modules via the J1939 network.