What causes a P103E code?

P103E 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 P103E code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P103E 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

P103E

NOXCD NOx controller feedback monitor, EGR actuation limited symptom (high limit)

What it means

This code indicates that the Engine Electronic Control Unit (EECU) has attempted to adjust the Exhaust Gas Recirculation (EGR) rate to correct for NOx levels, but the adjustment has reached its maximum calibrated limit.