What causes a SPN 3723 code?

SPN 3723 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 3723 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3723 active.

How do I fix SPN 3723?

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 3723

J1939 SPN 3723 — Body/Chassis parameter

What it means

DPF Regenerate Inhibit Switch - Data Erratic, Intermittent or Incorrect. This SPN indicates the Engine Control Module (ECM) or Body Controller is receiving an illogical signal from the dashboard switch used to manually stop an exhaust regeneration.