What causes a SPN 901 code?

SPN 901 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 901 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 901 active.

How do I fix SPN 901?

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 901

J1939 SPN 901 — Engine Management parameter

What it means

J1939 SPN 901 indicates an 'Engine Management Parameter' error, typically signaling a data communication mismatch or a timeout regarding engine-specific parameters across the CAN bus.