What causes a SPN 1077 code?

SPN 1077 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 1077 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1077 active.

How do I fix SPN 1077?

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 1077

SPN 1077 Fuel Injection Pump Fuel Control Valve

What it means

Indicates a fault within the fuel injection pump governor or the fuel control actuator circuitry, typically signifying a calibration or current range error.