What causes a P2224 code?

P2224 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 P2224 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2224 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

P2224

NOx Sensor Heater Control Circuit High Bank 1 Sensor 2

What it means

The Engine Control Module (ECM) has detected a voltage higher than the calibrated threshold on the heater control circuit for the outlet NOx sensor. This prevents the sensor from reaching its operating temperature and accurately measuring emissions.