What causes a SPN 3743 code?

SPN 3743 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 3743 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3743 active.

How do I fix SPN 3743?

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 3743

J1939 SPN 3743 — Body/Chassis parameter

What it means

SPN 3743 typically indicates a mismatch or error in 'Body/Chassis Parameters' being broadcast over the J1939 data link. This often pertains to the interface between the OEM chassis and an aftermarket body (e.g., crane, mixer, dump body).