What causes a SPN 249 code?

SPN 249 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 249 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 249 active.

How do I fix SPN 249?

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 249

J1939 SPN 249 — Fuel/Air parameter

What it means

SAE J1708/J1587 Data Link - Engine #1. This indicates a communication failure on the legacy data link.

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