What it means
A general circuit fault on the temperature element of the PM sensor - used to verify that the sensor is hot enough for measurement after regeneration.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The particulate matter (PM) sensor measures soot in the exhaust, and its temperature element helps the control module determine whether the sensor is hot enough to measure reliably after regeneration. This code sets when the temperature-element circuit has a general electrical fault, so the module cannot trust that temperature signal.
Common causes
Most likely first.
- Open or damaged temperature sensing element
- Damaged sensor wiring
- Loose or corroded connector
- Fault in the sensor circuit
Symptoms
- Check-engine light on
- Particulate matter sensor or aftertreatment warning
- Emissions inspection failure
How to diagnose it
- Read freeze-frame data and PM-sensor live data to note whether the temperature value is missing, implausible, or unavailable after regeneration.
- Inspect the PM sensor connector and exposed harness near the exhaust for looseness, corrosion, heat damage, or broken insulation.
- Check that the connector terminals are seated and clean, and look for a damaged or open temperature-sensing element.
- Using the wiring diagram, test continuity and shorts in the temperature circuit between the PM sensor and control module.
- If wiring and connections pass, test the sensor circuit and temperature element against the manufacturer’s specification before replacing the sensor.
Common fixes
- Reconnect or clean a loose or corroded PM-sensor temperature-circuit connector.
- Repair damaged wiring or restore a poor terminal connection in the temperature circuit.
- Replace the PM sensor if its temperature element or internal circuit is faulty.
Can I keep driving?
The vehicle may remain driveable, but the PM sensor or aftertreatment warning can stay on and emissions monitoring may be incomplete. Avoid ignoring the warning for long, especially if additional aftertreatment or drivability symptoms appear.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.