What causes a SPN 3446 code?

SPN 3446 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 3446 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3446 active.

How do I fix SPN 3446?

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 3446

J1939 SPN 3446 — Body/Chassis parameter

What it means

SPN 3446 refers to an 'Implement/Body-specific parameter' issue. It indicates that the Engine Control Module or Body Controller is receiving a parameter value that is out of range, invalid, or mismatched according to the vehicle's configuration.