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!
Ok so my truck won’t take more than $32 if gas. But once it gets to half way it says I have gas but really there isn’t any, the car won’t go. But shows I’m half full. Any idea if this is the reason as to why? Can’t really afford to take to infinity so i’d like to do it myself. Any help or recomandations would be greatly appreciated
Hi Lumie, thanks for reading our Nissan / Infiniti EVAP DIY guide. So quick question, when you say you are putting in 32 dollars worth of gas, how many gallons are you putting in? It may be a problem with your fuel tank floater, the unit that sends the fuel level to your instrument cluster. Let us know and we can help you out. Thanks!
I have a question that I’m hoping I can get a resolution to. I have a ’06 G35 coupe AT and was recently rear ended. I did the repairs myself and thought that replacing the evap can was gonna be straight forward , and it was. Except that I’m still throwing the same DTC saying that the valve is closed. I checked the plug for voltage just as I was told. One lead to the power and other to ground on the car. 12v is there ( actually 11.9v) but it’s not engaging. I removed the solenoid and put 12v to it directly and it engages no problem. I checked the plug with one lead on each of the wires and had 9v. I left the power wire plugged to the solenoid and grounded the other connection and the solenoid engaged as it should with the ignition. Left it that way and test drove it but still put me in limp mode, but gave me a P0448 code. Please help
Hi Chris, thanks for commenting.
If the power and ground at your EVAP in your Infiniti is good, have you considered damage or a break to the housing or the line from this unit? There could be a leak present, which seems likely considering the rear end accident. If there is one in place, your ECU will think that the EVAP valve is still malfunctioning. Check that out first and let me know!
What if there is no pressure
Hi Chris, thanks for reading and commenting on the Infiniti EVAP system guide.
If you have no pressure then that means there’s a leak or puncture somewhere in the system. Using a dye system should help you track down the leak and repair it.