What causes a SPN 4041 code?

SPN 4041 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 4041 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 4041 active.

How do I fix SPN 4041?

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 4041

20ms ECU OS Task Locked in an Endless Loop

What it means

The Engine Control Module (ECM) internal operating system has encountered a software execution failure where a 20-millisecond task cannot complete, leading to a processor lock-up.