P2567

Code

Generic P — Powertrain

Direct Ozone Reduction Catalyst Temperature Sensor Circuit

Brand: Generic

Type: P — Powertrain

Views: UK: 19 EN: 34 RU: 24

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Page language: EN

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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