What causes a P1489 code?

P1489 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 P1489 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1489 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

P1489

EGR valve stuck closed

What it means

The Engine Control Module (ECM) has detected that the Exhaust Gas Recirculation (EGR) valve is not responding to commanded movement and is physically stuck in the closed position.