What causes a SPN 3277 code?

SPN 3277 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 3277 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3277 active.

How do I fix SPN 3277?

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 3277

SPN 3277 FMI 31 Injector Cylinder 1 Internal Failure

What it means

This fault indicates that the Engine Control Module (ECM) has detected an internal electrical short or an open circuit condition for the Fuel Injector for Cylinder #1.