What causes a SPN 372 code?

SPN 372 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 372 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 372 active.

How do I fix SPN 372?

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 372

J1939 SPN 372 — Fuel/Air parameter

What it means

SPN 372 indicates a detection of an out-of-range or implausible value for the fuel system pressure, specifically relating to how the ECM calculates the fuel/air ratio requirements.