What causes a P1495 code?

P1495 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 P1495 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1495 active.

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

OBD-II

P1495

EGR failure detected causing fuel derate

What it means

The Engine Control Module (ECM) has detected that the Exhaust Gas Recirculation (EGR) system is not functioning within calibrated limits. To prevent engine damage and ensure emissions compliance, the ECM has commanded a fuel derate (reduction in power).