What causes a SPN 922 code?

SPN 922 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 922 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 922 active.

How do I fix SPN 922?

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 922

J1939 SPN 922 — Engine Management parameter

What it means

Momentary Engine Overspeed: The ECM has detected that the engine RPM exceeded the maximum governed threshold for a brief period.