P009F Fuel Pressure Relief Control Circuit Stuck On

P009F Fuel Pressure Relief Control Circuit Stuck On

OBD-II DTC Datasheet

Fuel Pressure Relief Control Circuit Stuck On

What does this mean?

This Generic Transmission Diagnostic Trouble Code (DTC) typically applies to all OBD-II vehicles. This may include, but is not limited to, Dodge, Ram, Chevy, Ford, GMC, Saturn, etc. Although generic, specific repair steps may vary depending on the brand / model.

The P009F OBD-II trouble code is one of five possible codes that indicate that the powertrain control module (PCM) has detected a malfunction and operation in the fuel pressure relief control circuit.

Codes associated with fuel pressure relief device: P009B, P009C, P009D, P009E and P009F.

The purpose of the fuel pressure relief control circuit is to control the amount and pressure of fuel supplied to the engine for proper operation. The PCM monitors the fuel pressure regulator and opens the fuel pressure relief valve to return excess fuel back to the fuel supply system.

P009F is set by the PCM when the fuel pressure relief control circuit is stuck on.

What is the severity of this DTC?

The severity of this code is usually moderate depending on the specific problem.

Example of a fuel pressure relief valve:

What are some of the symptoms of the code?

Symptoms of a P009F engine code may include:

• The engine will not start
• Poor engine performance
• Check Engine light is on
• Fuel dripping from the exhaust pipe
• Increased fuel consumption

What are some of the possible reasons for the code to appear?

Reasons for this code may include:

• Defective fuel pump
• Defective fuel pressure relief valve
• Fuel pressure regulator malfunction
• Corroded or damaged connector
• Faulty or damaged wiring
• Defective PCM

What are some steps to troubleshoot the P009F?

The first step in troubleshooting any problem is to review the vehicle-specific Technical Service Bulletins (TSBs) by year, model, and powerplant. In some cases, this can save you a lot of time in the long run by pointing you in the right direction.

Locate all components related to the fuel pressure relief control circuit. This will include the fuel pump, fuel pressure regulator, fuel pressure relief valve and PCM in a simplex system. Once these components are found, a thorough visual inspection should be performed to check all associated wiring and connectors for obvious defects such as scratches, scuffs, bare wires, or burn spots.

Fuel pressure tests

The appropriate fuel pressure will vary depending on the specific engine and the configuration of the fuel delivery system. To obtain the correct fuel pressure range and gauge mounting locations for accurate pressure testing, reference must be made to the technical data.

Advanced steps

The additional steps become very vehicle specific and require appropriate advanced equipment to be performed accurately. These procedures require a digital multimeter and vehicle-specific technical reference documents. Voltage requirements depend on the specific year of manufacture, vehicle model and engine.

Checking circuits

Voltage requirements will vary based on the specific engine, fuel pressure relief control circuit configuration, and components included. To obtain the correct voltage range for each component, refer to the technical data.

If this process reveals that there is no power source or ground connection, a continuity check may be required to check the condition of the wiring. Continuity tests are always performed with power disconnected from the circuit, and normal readings should be 0 ohms of resistance unless otherwise specified in the datasheet. Resistance or no continuity indicates faulty wiring or connectors that need to be repaired or replaced.

What is a routine repair?

• Replacing the fuel pump
• Replacing the fuel pressure relief valve
• Replacing the fuel pressure regulator
• Cleaning connectors from corrosion
• Repair or replacement of wiring
• Flashing or replacing PCM

Hopefully the information in this article has helped point you in the right direction for solving the problem with your fuel pressure relief circuit. This article is for informational purposes only and specific technical data and service bulletins for your vehicle should always take priority.

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