P20DB Code: Meaning, Causes, and Symptoms | OBD2 Codes

P20DB – Exhaust Aftertreatment Fuel Supply Control Stuck Open

 

P20DB Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

P20DB Possible Causes

 

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

 

P20DB Description

 

The 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.