What causes a SPN 3718 code?

SPN 3718 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 3718 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3718 active.

How do I fix SPN 3718?

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 3718

J1939 SPN 3718 — Body/Chassis parameter

What it means

Aftertreatment Regenerate Inhibit Switch Status. This code typically indicates a configuration mismatch or an invalid signal received from the Body/Chassis controller regarding the DPF Regen Inhibit switch.