What causes a P1496 code?

P1496 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 P1496 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1496 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

P1496

System fault triggered PM mode, closed EGR valve

What it means

The system has entered a protection mode that closes the Exhaust Gas Recirculation (EGR) valve to maximize exhaust heat to assist in soot reduction or protect the engine from excessive backpressure.