What causes a SPN 487 code?

SPN 487 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 487 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 487 active.

How do I fix SPN 487?

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 487

J1939 SPN 487 — Fuel/Air parameter

What it means

SPN 487 is a general parameter code often indicating a deviation in the Fuel/Air ratio or air-side performance that affects engine efficiency and emissions.