What causes a SPN 1820 code?

SPN 1820 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 1820 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1820 active.

How do I fix SPN 1820?

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 1820

DPF Intake Pressure Sensor Error

What it means

The pressure sensor at the inlet of the Diesel Particulate Filter is reporting values outside of the normal operating range.

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