As we all know that Fuel Pressure Relief Control Circuit performs the function of controlling the amount and pressure of the fuel to be delivered to the engine to function efficiently. This P009B code will be set by the PCM when the Fuel Pressure Relief Control Circuit is open. What causes this problem with Fuel Pressure Relief Control Circuit? A defective fuel pump can cause this problem If your vehicle’s fuel pressure relief valve is faulty, it can become another potential cause Failure of the fuel pressure regulator can be another cause Vehicle’s corroded or damaged connector and wirings PCM issues can too become a potential cause More Info About OBD Code P009B: https://partsavatar.ca/p009b-obd-ii-trouble-code-fuel-pressure-relief-control-circuit-open-fuel-pressure-regulator If you face another OBD Error Code then click this link: https://partsavatar.ca/check-engine-light-scan-read-all-obd-2-trouble-codes-p0-powertrain-p1-p2-diagnose-repair-fix-engine-error