What causes a SPN 25 code?

SPN 25 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 25 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 25 active.

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 25

J1939 SPN 25 — Engine parameter

What it means

General Engine Oil Pressure circuit. This indicates the oil pressure reading is outside the expected voltage range or abnormally low.

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