Particulate Matter Sensor Temperature Circuit Intermittent

Where it lives

For P24CA, the circuit described runs through the sensor. The description of P24CA reports a fault at the sensor.

Check these first

• Loose PM sensor connector causing an intermittent signal
• Chafed PM sensor wire rubbing on the exhaust or frame
• Intermittent internal failure in the PM sensor
• Moisture in the PM sensor connector

What to do next

1. Wiggle-test the PM sensor harness while watching live data
2. Inspect the PM sensor connector for moisture or corrosion
3. Check the PM sensor wiring routing for chafe points
4. Re-seat the PM sensor connector and retest
5. Replace the PM sensor if the signal keeps dropping out
6. Clear the code and retest

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