What causes a SPN 1957 code?

SPN 1957 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 1957 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1957 active.

How do I fix SPN 1957?

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.

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J1939 SPN

SPN 1957

EGR Valve Actuator Power Failure

What it means

The power supply circuit to the EGR actuator is open or shorted. The EGR system will be disabled, causing an engine derate.

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