P009F Code: Meaning, Causes, and Symptoms | OBD2 Codes

P009F – Fuel Pressure Relief Control Stuck On

 

P009F Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

P009F Possible Causes

 

Faulty Fuel Pressure Relief Valve,Fuel Pressure Relief Valve harness is open or shorted,Fuel Pressure Relief Valve circuit poor electrical connection

 

P009F Description

 

The Engine Control Module (ECM) uses the Fuel Rail Pressure (FRP) sensor to monitor the high side fuel pressure and the fuel rail pressure relief valve performance. The fuel rail pressure relief valve is designed to release fuel pressure in the event of an overpressure condition. This diagnostic looks for excessive fuel rail pressure decay to detect an open fuel rail pressure relief valve.