What causes a P2216 code?

P2216 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 P2216 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2216 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

P2216

NOx Sensor Circuit Intermittent High Input Bank 1 Sensor 2

What it means

The Engine Control Module (ECM) has detected an irregular signal or high voltage from the downstream (outlet) Nitrogen Oxide (NOx) sensor, located after the SCR catalyst.