What causes a SPN 1284 code?

SPN 1284 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 1284 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1284 active.

How do I fix SPN 1284?

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

Log in Sign up

J1939 SPN

SPN 1284

Engine Injector Control #12

What it means

J1939 parameter for monitoring the twelfth injector control actuator group.

Sign in to view symptoms, probable causes, diagnostic steps, severity, and related codes

Log in Sign up free