P24C7: Particulate Matter Sensor Temperature Circuit Range or Performance

What it means

Same as P24C6 with the signal in plausible range yet not matching the engine model.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The PM sensor measures exhaust soot, while its temperature element tells the control module whether the sensor has reached a suitable operating temperature after regeneration. This code sets when the temperature signal is electrically plausible but its reported temperature does not behave as expected for the engine and exhaust conditions.

Common causes

Most likely first.

1. Temperature sensing element drift or failure
2. Damaged sensor wiring
3. Loose or corroded connector
4. Exhaust conditions affecting the reading

Symptoms

• Check-engine light on
• Particulate matter sensor or aftertreatment warning
• Emissions inspection failure

How to diagnose it

1. Review freeze-frame data and PM-sensor temperature live data alongside engine load and regeneration status to see when the reading diverged from expected behavior.
2. Inspect the PM sensor and its exhaust-side wiring for heat damage, loose connectors, corrosion, or harness contact with hot components.
3. Check whether the temperature reading changes smoothly as the sensor warms, rather than remaining implausible or lagging behind exhaust conditions.
4. Inspect for exhaust leaks or abnormal exhaust conditions near the PM sensor that could affect its temperature reading.
5. Test the temperature circuit and sensor response against the manufacturer’s specification, then replace the sensor only if the circuit and exhaust conditions check out.

Common fixes

• Repair a loose or corroded PM-sensor temperature-circuit connector.
• Repair heat-damaged or chafed wiring near the exhaust.
• Correct an exhaust leak or other confirmed abnormal exhaust condition affecting the reading.
• Replace a temperature element that responds incorrectly despite a sound circuit.

Can I keep driving?

You can generally drive if the vehicle behaves normally, but the PM-sensor warning may remain and the vehicle may fail an emissions inspection. Arrange diagnosis soon, particularly if other aftertreatment warnings appear.