P009B
Fuel Pressure Relief Control Circuit/Open
Open circuit at fuel pressure relief solenoid (used to bleed off rail pressure during certain operating modes).
Open circuit at fuel pressure relief solenoid (used to bleed off rail pressure during certain operating modes).
Common causes
- high
Wiring break
One of the most commonly reported causes for this code — check this first.
Typical part cost: $90-550
- low
Pin pushed back out of connector body
Less common, but worth ruling out after the more likely causes.
Typical part cost: $90-550
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P009B.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for P009B.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for P009B.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does P009B mean?
P009B means "Fuel Pressure Relief Control Circuit/Open". It is a generic OBD-II code that points to a fault in the fuel & air metering / auxiliary emission controls.
What are the most common causes of P009B?
wiring break; pin pushed back out of connector body; cracked solder joint inside the module or sensor — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full P009B diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.