P24FC
Particulate Matter Sensor Heater Control Circuit Driver Current/Temperature Too High
The PM (soot) sensor heater is driven by a current-limited stage so it can burn off accumulated soot before each measurement. The driver reports current or junction temperature above the safe limit and disables itself. Often a partial short across the heater or sensor element after coolant intrusion.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Partial short across the heater elementCommon
- Driver overheating due to poor cooling on the modulePossible
Parts involved
- Pm Sensor Heater
- Heater Driver
P24FC is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.