What causes a SPN 947 code?

SPN 947 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 947 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 947 active.

How do I fix SPN 947?

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 947

J1939 SPN 947 — Engine Management parameter

What it means

Commonly associated with the 'Requested Engine Speed/Torque Control' or 'Engine Management Parameter' mismatch. It indicates the engine controller is receiving invalid data or has a configuration conflict regarding its operating parameters via the J1939 network.