What causes a SPN 427 code?

SPN 427 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 427 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 427 active.

How do I fix SPN 427?

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 427

J1939 SPN 427 — Fuel/Air parameter

What it means

This is a generic SAE J1939 network communication fault indicating the ECM/Controller is unable to receive or transmit specific fuel or air management parameters over the data link.