What causes a SPN 1992 code?

SPN 1992 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 1992 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1992 active.

How do I fix SPN 1992?

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 1992

DPF Regeneration Incomplete Due to Low Temperature

What it means

Exhaust temperatures failed to reach or maintain the required level to successfully burn off soot in the DPF.

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