What causes a SPN 3615 code?

SPN 3615 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 3615 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3615 active.

How do I fix SPN 3615?

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 3615

J1939 SPN 3615 — Body/Chassis parameter

What it means

DPF Regeneration Inhibit Switch Status. This code indicates the Engine Control Module (ECM) is receiving invalid data or has lost communication with the physical switch/body controller regarding the DPF regen inhibit status.