What causes a SPN 5894 code?

SPN 5894 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 5894 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 5894 active.

How do I fix SPN 5894?

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 5894

Cummins fault code 5894

What it means

SCR Temperature Sensor Circuit - Voltage Above Normal or Shorted to High Source. This indicates the ECM is detecting a voltage signal from the Selective Catalytic Reduction (SCR) temperature sensors that is higher than expected.