What causes a SPN 894 code?

SPN 894 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 894 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 894 active.

How do I fix SPN 894?

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 894

J1939 SPN 894 — Engine Management parameter

What it means

J1939 SPN 894 indicates a data validity or communication error regarding the Transmission Requested Engine Control Strategy. This is typically a 'network' code where the ECM is receiving invalid or missing torque/speed management data from the transmission.