Code
P2567
Generic
P — Powertrain
Direct Ozone Reduction Catalyst Temperature Sensor Circuit
Views:
UK: 19
EN: 24
RU: 20
AI status
Completed
Completed
100%
Causes
- Open or short in sensor signal, power, or ground wiring
- Corroded, loose, or damaged connector at the catalyst temperature sensor
- Failed or contaminated catalyst temperature sensor (internal fault or heater failure)
- Blown fuse or faulty relay feeding the sensor heater
- PCM/ECM internal fault or poor drivetrain module connection
- Excessive exhaust leaks or physical damage heating the sensor beyond limits
Symptoms
- Check Engine MIL illuminated
- Reduced evaporative/emissions control effectiveness or failed emissions test
- Possible limp mode/performance derate on some vehicles
- Stored freeze-frame and related emissions trouble codes
- No obvious driveability symptoms in some cases
What to check
- Verify stored freeze frame data and all related codes with a scan tool
- Perform a visual inspection of the sensor, connector, and wiring for heat damage, corrosion, or breaks
- Wiggle test wiring while monitoring live sensor data to detect intermittent opens/shorts
- Check for proper reference voltage/power and ground at the sensor connector with ignition on
- Measure sensor resistance and/or output voltage and compare to expected range
- Inspect for exhaust leaks or physical damage near the sensor that could affect readings
Signal parameters
- Typical sensor output: 0–5 V signal proportional to measured temperature (varies by manufacturer)
- Heater circuit: expected supply voltage near battery voltage when commanded, heater current typically 0.1–1.0 A (vehicle dependent)
- Resistance of NTC-type thermistor: decreases with increasing temperature; ambient resistance often in kiloohms (check OE spec)
- Response: sensor voltage or resistance should change when the sensor is heated or cooled within seconds
- No continuity to battery positive (short) or infinite/open circuit (open) in the signal/ground should not be present
Diagnostic algorithm
- Retrieve DTC(s) and freeze frame with a scan tool. Note conditions when code set.
- Visually inspect the catalyst temperature sensor, harness, and connector for corrosion, heat damage, or disconnection.
- With ignition ON (engine OFF), backprobe the sensor connector and verify reference voltage/power and ground presence. Record voltages.
- Measure sensor signal voltage and resistance at the connector. Compare to OE expected ranges. If resistance specs are unknown, compare to a similar sensor or consult data.
- Heat or cool the sensor (carefully with a heat gun or cooling spray) and observe sensor voltage/resistance change to confirm proper response.
- Check the heater circuit: verify fuse/relay, measure voltage at heater terminal, and measure heater resistance. If no supply, trace and repair fuse/relay/wiring.
- Perform wiggle/continuity tests on harness between sensor and PCM to detect intermittent faults or shorts to power/ground.
- If wiring and power/ground are good but sensor readings are out of range, replace the catalyst temperature sensor and clear codes.
- After repair, erase DTC(s) and perform a drive cycle or required readiness tests. If code returns, consider PCM diagnosis or manufacturer-specific tests.
Likely causes
- Faulty or contaminated catalyst temperature sensor
- Damaged or disconnected wiring harness or connector
- Short to battery or ground in the sensor circuit
- Open or high-resistance ground or reference voltage
- Failed sensor heater or blown fuse for the heater circuit
Fault status
Status
PCM detected an abnormal or out-of-range signal in the Direct Ozone Reduction Catalyst Temperature Sensor circuit (open, short, intermittent, or sensor/heater failure).
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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