What causes a SPN 295 code?

SPN 295 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 295 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 295 active.

How do I fix SPN 295?

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 295

J1939 SPN 295 — Fuel/Air parameter

What it means

Barometric Pressure (Ambient Air Pressure) signal is out of range, erratic, or invalid. This sensor is used by the ECM to calculate air density for fuel injection and turbocharger boost control.