What causes a SPN 984 code?

SPN 984 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 984 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 984 active.

How do I fix SPN 984?

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 984

J1939 SPN 984 — Engine Management parameter

What it means

Engine Oil Level High/Low or Circuit Fault. This parameter monitors the engine oil level to ensure adequate lubrication and prevent engine damage.