What causes a SPN 3757 code?

SPN 3757 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 3757 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3757 active.

How do I fix SPN 3757?

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 3757

J1939 SPN 3757 — Body/Chassis parameter

What it means

DPF Regeneration Inhibit Switch Status. This code indicates a mismatch or communication error regarding the status of the DPF inhibit switch, preventing the engine from understanding if a parked regeneration is being blocked by a body-builder interface.