P2575 sets when the powertrain control module detects a high voltage condition on the direct ozone reduction catalyst deterioration sensor circuit. The sensor monitors the condition of the catalyst that reduces ozone in the exhaust; when its circuit reads above the expected range, the code is triggered. This typically indicates an electrical fault rather than a mechanical failure of the catalyst itself.
The sensor itself may have an internal short or failed heating element, causing the circuit to read high voltage.
Damaged wires, corrosion, or loose connectors can create a short-to-power or open ground condition, raising the sensor voltage.
A wiring harness that contacts a power source can feed higher voltage into the sensor signal line, triggering the code.
If the ground path or the 5 V reference from the PCM is interrupted, the sensor circuit can read abnormally high.
Non‑OEM wiring or added electrical accessories can interfere with the sensor circuit and cause a high reading.
An internal fault in the control module that supplies the sensor reference voltage can produce a high signal, but this is the least common cause.
No. The PCM is rarely the cause; the fault is usually in the sensor or its wiring. PCM replacement should only be considered after all other possibilities are ruled out.
The vehicle will still run, but you may experience reduced fuel economy and risk failing an emissions test. It is advisable to repair the issue promptly.
P2575 points to an electrical issue with the sensor circuit, not a mechanical failure of the catalyst. If the catalyst is severely deteriorated, it may affect sensor readings, but the primary fault is usually the sensor or wiring.
P2575 is a generic OBD‑II code defined for all manufacturers, but the exact location and design of the direct ozone reduction catalyst sensor can vary. Always refer to the vehicle‑specific service information.