What causes a P2222 code?

P2222 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 P2222 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2222 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

P2222

NOx Sensor Heater Control Circuit Performance Bank 1 Sensor 2

What it means

The Engine Control Module (ECM) has detected that the NOx sensor heater circuit is not reaching or maintaining the required operating temperature to accurately measure nitrogen oxide levels.