Direct Ozone Reduction Catalyst Temperature Sensor Circuit High
The P2570 code indicates that the Powertrain Control Module (PCM) has detected a voltage signal from the Direct Ozone Reduction (DOR) catalyst temperature sensor that is higher than the expected range. This sensor monitors the temperature of the DOR catalyst, which is part of the emissions system designed to reduce ozone. A high voltage reading typically suggests a short circuit to power, a faulty sensor, or wiring issues. This can lead to incorrect temperature readings, potentially affecting catalyst efficiency and emissions control.
01. Most Common Causes
- Faulty Direct Ozone Reduction catalyst temperature sensor
- Short circuit to voltage in the sensor circuit
- Damaged or corroded wiring/connectors
- PCM software or hardware issue (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Possible failed emissions test
- Reduced fuel efficiency (in some cases)
- No noticeable drivability issues in many cases
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the DOR temperature sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Measure the sensor's voltage signal with a multimeter; compare to manufacturer specifications (typically 0.5-4.5V).
Step 4: If voltage is high (e.g., near 5V), disconnect the sensor; if voltage drops, replace the sensor. If voltage remains high, repair the short circuit in the wiring.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is generally safe to drive short distances, but the Check Engine Light will remain on. However, the vehicle may fail an emissions test, and prolonged driving could affect catalyst performance. It is recommended to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150, including parts and labor. The sensor itself is usually inexpensive ($20-$50), and labor is minimal (0.5-1 hour).