What causes a SPN 2054 code?

SPN 2054 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 2054 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 2054 active.

How do I fix SPN 2054?

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 2054

SPN 2054 - Selective Catalytic Reduction Catalyst Inlet Temperature Sensor

What it means

Indicates a communication error, circuit failure, or out-of-range signal from the SCR Catalyst Inlet Temperature Sensor, typically used to monitor urea dosing efficiency.