Particulate Matter Sensor Heater Control Circuit High

Where it lives

For P24B6, the circuit described runs through the sensor. The description of P24B6 reports a fault at the sensor.

Check these first

• A short to voltage in the particulate matter sensor heater wiring
• A heater element inside the sensor that has failed
• A pinched or rubbed harness on the heater feed
• Water or corrosion in the sensor connector

What to do next

1. Inspect the heater wiring for a short to voltage
2. Check the connector for water intrusion and corroded pins
3. Measure the heater element resistance against a known-good value
4. Command the heater on with a scan tool and watch for the fault to set
5. Replace the particulate matter sensor if the element is out of range
6. Clear the code and retest

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