What causes a SPN 2758 code?

SPN 2758 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 2758 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 2758 active.

How do I fix SPN 2758?

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 2758

J1939 SPN 2758 — Aftertreatment/Emissions parameter

What it means

SPN 2758 typically indicates a 'Engine Charge Air Cooler 1 Outlet Pressure' or 'Intake Manifold Pressure' rationality fault where the sensor reading does not match expected values based on barometric pressure or engine load.