Technical Description of OBD-II Trouble Code
The circuit controlling the relief of fuel pressure is experiencing a high voltage condition.
What does that mean?
This diagnostic trouble code (DTC) is a generic code that applies to all OBD-II vehicles, including Dodge, Ram, Chevy, Ford, GMC, Saturn, and others. The specific repair steps may vary depending on the make and model of the vehicle.
The P009D DTC indicates that the Powertrain Control Module (PCM) has detected a malfunction in the Fuel Pressure Relief Control Circuit.
Other codes associated with fuel pressure relief malfunctions include P009B, P009C, P009D, P009E, and P009F.
The Fuel Pressure Relief Control Circuit is responsible for controlling the amount and pressure of fuel delivered 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.
Code P009D is set by the PCM when the Fuel Pressure Relief Control Circuit has a high voltage condition.
What is the severity of this DTC?
The severity of this code is typically moderate, depending on the specific malfunction.
Here is an example of a fuel pressure relief valve:
What are some of the symptoms of the code?
Symptoms of a P009D engine code may include:
What are some of the possible causes of the code?
Possible causes for this code may include:
What are some P009D troubleshooting steps?
The first step in troubleshooting any malfunction is to research the Technical Service Bulletins (TSB’s) for the specific vehicle based on the year, model, and power plant. This can save time by providing guidance in the right direction.
Locate all of the components associated with the Fuel Pressure Relief Control Circuit, including the fuel pump, fuel pressure regulator, fuel pressure relief valve, and the PCM. Perform a thorough visual inspection of the wiring and connectors for any obvious defects such as scraping, rubbing, bare wires, or burn spots.
Perform Fuel Pressure Tests
The appropriate fuel pressure range and locations for installing a fuel pressure gauge to perform accurate pressure tests can be found in technical data specific to the engine and fuel supply system configuration.
Advanced Steps
Advanced troubleshooting steps are vehicle-specific and require the use of advanced equipment, such as a digital multimeter, and specific technical references for the vehicle. Voltage requirements will vary based on the year, model, and engine of the vehicle.
Perform Circuit Checks
Voltage requirements for the Fuel Pressure Relief Control Circuit and its components will vary. Technical data should be referenced to obtain the correct voltage range for each component.
If a power source or ground is absent, continuity testing may be necessary to check the condition of the wiring. Continuity tests should be performed with the power removed from the circuit, and normal readings should be 0 ohms of resistance unless otherwise specified by the technical data. Resistance or no continuity indicates faulty wiring or connectors that need to be repaired or replaced.
What Are Some Common Repairs?
We hope that the information in this article has been helpful in addressing the problem with your Fuel Pressure Relief Control Circuit. However, please note that the specific technical data and service bulletins for your vehicle should always take priority.
