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DTC codes / P23xx · Ignition system and misfire / P23C0
P23C0 means the powertrain control module (PCM) has detected that the nitrogen oxide (NOx) sensor on bank 1, sensor 3 is responding too slowly when the exhaust NOx level drops from high to low. The PCM monitors the sensor's signal during specific deceleration or lean-to-rich transitions and flags the code when the sensor's voltage or current change lags beyond a calibrated time window.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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