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.
Affected components
- Pm sensor heater
- Heater driver
Common causes
- High likelihood: Partial short across the heater element
- Medium likelihood: Driver overheating due to poor cooling on the module
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.