P20D9 - Exhaust Aftertreatment Fuel Supply Control Circuit Low
- Faulty Exhaust Aftertreatment Fuel Supply Control
- Exhaust Aftertreatment Fuel Supply Control harness is open or shorted
- Exhaust Aftertreatment Fuel Supply Control circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P20d9 DescriptionThe exhaust fuel addition injector assembly is mounted on the outlet of the turbocharger sub-assembly, and low-pressure fuel is supplied to the exhaust fuel addition injector assembly by the feed pump in the supply pump assembly. The exhaust fuel addition injector assembly adds fuel by a control signal from the Engine Control Module (ECM). This injector is used for two different controls: Particulate Matter (PM) forced regeneration and PM reduction.
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