The OBDII trouble code P0455 is a pretty common fuel evaporative system error, and it’s usually related to your gas cap. Many late model vehicles like our 2006 Infiniti G35 come with a gas cap that features a blow by port for excess fuel pressure. When this one way valve goes bad or loses it’s seal, this trouble code can be triggered, lighting your Malfunction Indicator Lamp (MIL).
Today we’ll be showing you what the evap system is comprised of, how to service Infiniti evap system and where it’s located. Our test vehicle is a 2006 Infiniti G35 with a six speed transmission and the VQ35DE.
Possible causes of DTC P0455
- Bad gas cap
- Evap canister leak
- Evap system leak
- Fuel tank damaged
Before we get started on our How To Service Infiniti Evap System Guide, it’s a good idea to understand what the evaporative system in your Infiniti does. This fuel control system is meant to reduce emissions and cut down on hydrocarbons that can be generated from your fuel system.
Because the fuel in your gas tank and fuel lines creates fuel vapor, there needs to be a system to reclaim and relieve this vapor. This is what your Evap canister is for. The EVAP canister is located under your vehicle and mounted near your gas tank, if you need a How To Test your EVAP canister guide, check here.
Your EVAP system stores the vapors in your canister, which uses carbon to filter out the vapor. When you turn on your VQ35DE, there’s a line that runs from the intake manifold to the EVAP system, and is controlled by your VQ35DE EVAP canister purge volume solenoid valve. This vapor is pushed then into the intake manifold by the canister purge volume control valve, and as the engine runs, the flow rate of vapor is regulated as the air flow increases.
How To Resolve your P0455 DTC trouble code
Step 1 : Tighten your gas cap or replace it – As easy as it gets right? Simply purchase a replacement gas cap and see if that will do the trick. Because your Infiniti gas cap has a one way relief valve in it, should this valve become damaged or no good, this will cause your P0455 code.
Step 2 : Check your EVAP canister purge volume control solenoid valve. This valve is located in your VQ35DE engine bay and is mounted on the passenger side of the engine near the intake manifold.
There’s a set of vacuum hoses that run off the intake manifold to the controller as shown below.
To locate your EVAP canister purge volume control solenoid, simply follow the vacuum line from your intake manifold to the bracket shown below.
Unplug the two pin weatherproof connector and we’ll be showing you how to test this connector for proper power and signal. First unplug the connector and inspect the hoses for any leaking. Use a small bottle filled with soapy water to gently spray on the hoses for signs of leakage.
Next move down the vacuum line until you find the EVAP resonator, the plastic one way valve shown in the image below. This will lead to your EVAP service port, which should be covered by a green cap.
Unscrew this green cap and connect a pressure tester and pressurize your EVAP system to 0.2 – 0.4 psi worth of air. Remove the EVAP service port adapter and the pressure tester to commence looking for your leak.
Once you’ve located the leak in question, simply replace the vacuum line to fix your P0455 OBDII trouble code. You now know how to service Infiniti EVAP system, if you have any questions or comments please feel free to leave them below!