What causes a SPN 351 code?

SPN 351 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 351 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 351 active.

How do I fix SPN 351?

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.

OBDIY

J1939 SPN

SPN 351

J1939 SPN 351 — Fuel/Air parameter

What it means

In the J1939 standard, SPN 351 refers specifically to 'Injector Metering Rail 2 Pressure' or 'Air Intake Pressure' depending on the specific manufacturer's implementation (commonly associated with the intake manifold pressure sensor).