Code P0456 what gives? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Andryuha · 05-16-2018, 01:54 PM

I searched, but couldn't find any solutions. Last week, I started my car in the morning and CEL came on. I pulled the code and P0456 came up (minor leak in EVAP system). The first thing I checked was the gas cap. It was on tight with no visible damage to the rubber. The only thing I noticed was that a metal flap on the filler neck was missing (maybe it was never there to begin with on our cars?). The car seems to run just fine, but the MPG has definitely dipped a bit. What else can I check? The car is a 2013 BRZ with 45,000 miles on the clock.

Thanks in advance!

Tcoat · 05-16-2018, 02:10 PM

Check all your hoses and fittings in the system.
All the info you need is here:
https://demos.starbase7.net/t3Portal..._rm_index.html

humfrz · 05-16-2018, 03:14 PM

Quote:

Originally Posted by Andryuha

I searched, but couldn't find any solutions. Last week, I started my car in the morning and CEL came on. I pulled the code and P0456 came up (minor leak in EVAP system). The first thing I checked was the gas cap. It was on tight with no visible damage to the rubber. The only thing I noticed was that a metal flap on the filler neck was missing (maybe it was never there to begin with on our cars?). The car seems to run just fine, but the MPG has definitely dipped a bit. What else can I check? The car is a 2013 BRZ with 45,000 miles on the clock.

Thanks in advance!

Welcome to ...... The Forum ......

You might consider erasing the code and see if it comes back ...... maybe it was just a hiccup ........

humfrz

Andryuha · 05-16-2018, 04:47 PM

Quote:

Originally Posted by humfrz

Welcome to ...... The Forum ......

You might consider erasing the code and see if it comes back ...... maybe it was just a hiccup ........

humfrz

Thanks! I've been lurking on here since I got the car in '14. I did try erasing the code, but it came back the next day.

Andryuha · 05-16-2018, 04:48 PM

Quote:

Originally Posted by Tcoat

Check all your hoses and fittings in the system.
All the info you need is here:
https://demos.starbase7.net/t3Portal..._rm_index.html

Awesome. I'll check it out. I figured that maybe this was something more or less common on our cars.

Tcoat · 05-16-2018, 04:52 PM

Quote:

Originally Posted by Andryuha

Awesome. I'll check it out. I figured that maybe this was something more or less common on our cars.

Wouldn't call it "common" but it can happen to any car. Usually some little leak someplace but they can be hard to track down.

gravitylover · 05-17-2018, 05:49 PM

Yeah I've been trying to figure out a small evap leak on my 06 Durango for a year now. Usually the gascap message pops a few miles before the cel so chances are it's something towards the tank or filler tube but there's nothing wrong visually. I did have someone say to change the vent solenoid, it apparently controls the pressure release between the tank and charcoal canister. Might be something for OP to look at in this case.

Andryuha · 05-17-2018, 11:49 PM

I should also mention that I my have an exhaust leak. I haven't had a chance to get under there, but I have an UEL header that may be leaking (Borla). I am wondering if there could be some correlation. Although I would think that an exhaust leak around the header would result in an O2 sensor code.

Andryuha · 05-22-2018, 03:29 PM

UPDATE: The code went away a few days ago and has not come back yet.

05-16-2018, 01:54 PM	#1
Andryuha Junior Member Join Date: Feb 2016 Drives: '13 BRZ Location: Cleveland Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Code P0456 what gives? I searched, but couldn't find any solutions. Last week, I started my car in the morning and CEL came on. I pulled the code and P0456 came up (minor leak in EVAP system). The first thing I checked was the gas cap. It was on tight with no visible damage to the rubber. The only thing I noticed was that a metal flap on the filler neck was missing (maybe it was never there to begin with on our cars?). The car seems to run just fine, but the MPG has definitely dipped a bit. What else can I check? The car is a 2013 BRZ with 45,000 miles on the clock. Thanks in advance!

05-16-2018, 02:10 PM	#2
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,841 Thanks: 61,656 Thanked 108,294 Times in 46,456 Posts Mentioned: 2499 Post(s) Tagged: 50 Thread(s)	Check all your hoses and fittings in the system. All the info you need is here: https://demos.starbase7.net/t3Portal..._rm_index.html Attached Images __________________ Racecar spelled backwards is Racecar, because Racecar.

05-17-2018, 05:49 PM	#7
gravitylover Senior Member Join Date: Nov 2014 Drives: 2013 BRZ Premium 6MT White Location: SE NY Posts: 1,503 Thanks: 1,218 Thanked 669 Times in 474 Posts Mentioned: 7 Post(s) Tagged: 1 Thread(s)	Yeah I've been trying to figure out a small evap leak on my 06 Durango for a year now. Usually the gascap message pops a few miles before the cel so chances are it's something towards the tank or filler tube but there's nothing wrong visually. I did have someone say to change the vent solenoid, it apparently controls the pressure release between the tank and charcoal canister. Might be something for OP to look at in this case. __________________

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05-17-2018, 11:49 PM	#8
Andryuha Junior Member Join Date: Feb 2016 Drives: '13 BRZ Location: Cleveland Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I should also mention that I my have an exhaust leak. I haven't had a chance to get under there, but I have an UEL header that may be leaking (Borla). I am wondering if there could be some correlation. Although I would think that an exhaust leak around the header would result in an O2 sensor code.

05-22-2018, 03:29 PM	#9
Andryuha Junior Member Join Date: Feb 2016 Drives: '13 BRZ Location: Cleveland Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	UPDATE: The code went away a few days ago and has not come back yet.

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