What causes a SPN 970 code?

SPN 970 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 970 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 970 active.

How do I fix SPN 970?

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 970

Engine Auxiliary Shutdown Switch Circuit Fault (SPN 970)

What it means

This fault indicates an issue with the remote or auxiliary engine shutdown switch circuit, typically triggered when the signal to the ECM is interrupted or grounded unexpectedly.