Code P2570 indicates that the powertrain control module (PCM) has detected a high voltage condition in the direct ozone reduction catalyst temperature sensor circuit. This sensor monitors the temperature of a special radiator-like catalyst that converts ground-level ozone into oxygen. A high circuit voltage typically points to an open circuit, a short to voltage, or a faulty sensor.
The sensor itself may have failed internally, causing it to output a constant high voltage signal to the PCM.
A break in the wiring between the sensor and the PCM can cause the signal voltage to float high, triggering the code.
The signal wire may be shorted to a reference voltage or battery voltage source, pulling the signal high.
Corrosion, bent pins, or loose terminals at the sensor connector or PCM connector can create high resistance or an open circuit.
The PCM itself may have an internal fault causing it to misread the sensor signal. This is the least likely cause and should only be considered after all other possibilities are ruled out.
It is a special radiator-like catalyst that converts ground-level ozone into oxygen as air passes through it. This helps reduce smog-forming ozone. The temperature sensor monitors the catalyst's temperature to ensure proper operation.
Yes, the vehicle is usually safe to drive. This code does not affect engine performance or safety systems. However, the emissions system may not be working optimally, and you may fail an emissions test.
No, PCM failure is very rare for this code. The most common causes are a faulty sensor or wiring issue. The PCM should only be suspected after all other possibilities have been thoroughly tested and ruled out.
A multimeter can be used to test the sensor's resistance and check the wiring for shorts or opens. If the sensor's resistance is within specification and the wiring is intact, the problem may lie elsewhere, but the sensor is still the most likely culprit.