What are the common causes of P24B7?

PM sensor heater element resistance drifted out of spec. Damaged or chafed PM sensor heater wiring. Contaminated or wet PM sensor heater connector.

Measure PM sensor heater resistance and compare to spec. Inspect the PM sensor heater wiring for damage. Check the PM sensor connector for water or soot. Confirm heater supply voltage at the PM sensor. Replace the PM sensor if heater resistance is out of spec. Clear the code and retest.

P24B7

Particulate Matter Sensor Heater Resistance

System: Auxiliary emission controls (P code)
Lamp: Check Engine Light
Category: Powertrain - Auxiliary Emissions Controls

What it means

P24B7 means Particulate Matter Sensor Heater Resistance.

Where it lives

For P24B7, start at the sensor the description names.

Check these first

PM sensor heater element resistance drifted out of spec
Damaged or chafed PM sensor heater wiring
Contaminated or wet PM sensor heater connector

What to do next

Measure PM sensor heater resistance and compare to spec
Inspect the PM sensor heater wiring for damage
Check the PM sensor connector for water or soot
Confirm heater supply voltage at the PM sensor
Replace the PM sensor if heater resistance is out of spec
Clear the code and retest

Look up another code

Code or symptom

Enter a full code or a symptom. Press / to search. How to read a code

Type a code above, or start from a symptom or a common code.

Updated

Generic SAE J2012 definition. Last updated 2026-10-10.