What causes a SPN 3700 code?

SPN 3700 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 3700 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3700 active.

How do I fix SPN 3700?

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 3700

SPN 3700 — Aftertreatment 1 Diesel Particulate Filter Active Regeneration Status

What it means

This is an informational status code indicating that an active regeneration of the Diesel Particulate Filter is required but cannot be completed under current driving conditions, or it is currently in progress.