What causes a SPN 931 code?

SPN 931 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 931 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 931 active.

How do I fix SPN 931?

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 931

J1939 SPN 931 — Engine Management parameter

What it means

SPN 931 typically refers to the Fuel Injection Pump Fuel Control Valve. This code indicates an electrical or performance fault in the actuator that regulates the amount of fuel delivered to the high-pressure pump.