What causes a P103F code?

P103F 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 P103F code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P103F 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

P103F

NOXCD NOx controller feedback monitor, VGT surge clamping symptom

What it means

The Engine Control Module (ECM) has detected fluctuations in the NOx readings that correlate with unintended oscillations (surging) of the Variable Geometry Turbocharger.