P2568 indicates that the engine control module has detected a signal from the direct ozone reduction catalyst temperature sensor that is outside the expected range or not performing as intended. This sensor monitors the temperature of the catalyst that reduces ozone in the exhaust stream.
The sensor element can degrade or fail, sending an out‑of‑range voltage to the ECM.
Corroded, broken, or loose wires and connectors between the sensor and ECM can cause erratic signals.
A leak upstream of the sensor can alter exhaust temperature, leading to a range/performance fault.
If the direct ozone reduction catalyst is deteriorated, its temperature profile may fall outside calibrated limits.
In rare cases, an outdated ECM calibration can misinterpret a valid sensor signal.
The ECM is rarely the cause; the fault is usually the sensor, wiring, or an exhaust issue. Replace the ECM only after all other possibilities are eliminated and a manufacturer service bulletin directs it.
The vehicle will typically remain drivable, but emissions may exceed limits and the check‑engine light will stay on. Prompt diagnosis is recommended.
Clearing the code only removes the stored fault; the underlying condition will cause the code to return.
Not necessarily; a thorough wiring and connector check often reveals a repairable fault without replacing the sensor.