What causes a SPN 942 code?

SPN 942 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 942 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 942 active.

How do I fix SPN 942?

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 942

J1939 SPN 942 — Engine Management parameter

What it means

Engine Management Parameter error. This code typically indicates that the Engine Control Module has detected a configuration error or a failure in the non-volatile memory (NVM) related to specific engine management parameters.