What causes a SPN 3437 code?

SPN 3437 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 3437 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3437 active.

How do I fix SPN 3437?

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 3437

J1939 SPN 3437 — Body/Chassis parameter

What it means

This is a generic Parameter Group Number (PGN) related code indicating that the body or chassis control system is broadcasting data that is missing, out of range, or invalid as perceived by other modules on the J1939 data link.