What causes a SPN 3412 code?

SPN 3412 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 3412 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3412 active.

How do I fix SPN 3412?

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 3412

J1939 SPN 3412 — Body/Chassis parameter

What it means

SPN 3412 relates to the Body/Chassis parameter data. It typically indicates that the vehicle controller is receiving data that is out of range, erratic, or missing regarding body-specific equipment (e.g., PTO, liftgate, outriggers, or bed position sensors).