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How I fixed a P0456 code

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NotACop
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Joined: Tue Jun 02, 2015 8:08 am

How I fixed a P0456 code

Post by NotACop » Tue Jun 02, 2015 10:04 am

Just wanted to post this in case anyone else with the same issue could benefit.

I got a P0456 code from a check engine light awhile back. It was intermittent, and kept going on and off. I would also get a notification of "Check Fuel Fill Inlet".

I did some research, and found that a common issue with the EVAP system has to do with a faulty capless fuel inlet. So I followed some online instructions and cleaned the inlet to make sure there was no debris obstructing it from creating a tight seal. Still had the check engine light 200+ miles later.

I called my local ford dealership and found that another common issue was the fuel vapor purge valve. If it starts to malfunction and leaks, it will cause the PCM to throw a code.

I followed the great instruction from this video in order to check if the valve was leaky:

https://www.youtube.com/watch?v=qR0Dm7IqgNA

Found that it was and replaced it, and could tell a huge difference in testing after replacing.

In the 3.7L the valve is right on top of the engine to the right of the intake manifold next to the throttle body. It was a $37 part, and an easy fix.

Ford part # 9C915: http://www.amazon.com/Genuine-Ford-9U5Z ... B0031B11GW

I figured I'd try to save someone the $120+ diag fees that the dealership will charge.
2014 Police Interceptor Sedan
- Silver Grey Metallic
- 3.7L TiVCT
- Setina PB400
- Motorola Laird TRABT1500 Trunk
- Browning BR-2427 Top


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Re: P0456

Post by Webmaster » Tue Jun 02, 2015 10:30 am

Thanks for the info!
2000 Ford Taurus SEL (excellent car, sold to a friend)
1992 Mercury Sable GS (good car except for the tranny, sold)
Current: 03 F150 King Ranch SuperCrew
Other Fords owned: 02 F150 SuperCrew 4x4, 11 F150 EcoBoost, 07 Ranger, 01 F150 XLT, 98 F150 XLT, 96 Thunderbird LX, 95 Escort GT, 86 Mustang LX, 82 Mustang

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NotACop
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Posts: 32
Joined: Tue Jun 02, 2015 8:08 am

Re: P0456

Post by NotACop » Wed Nov 25, 2015 9:50 am

Update: this worked for about 2,000 miles, then it came back on. After bringing it to Ford and having them smoke test it (and misdiagnose it), I ended up figuring out it was where the rubber hose from the fuel inlet pipe meets the tank.

They attach it with a hose clamp...so I removed it, cleaned it and lubricated it to make sure there was a tight seal, and reinstalled. *knock on wood* I haven't had an issue with it since.

Just beware...the Ford dealer was trying to convince me I had a leaky inlet pipe (the actual inlet pipe is welded aluminum) and wanted me to replace the whole thing ($400+). I'm not trying to say that they were trying to scam anyone, but they might not always investigate as much as they should, and might cost you a bit of money. For me, their $400+ fix ended up being a $0 fix.
2014 Police Interceptor Sedan
- Silver Grey Metallic
- 3.7L TiVCT
- Setina PB400
- Motorola Laird TRABT1500 Trunk
- Browning BR-2427 Top

Daveja50
New Member
Posts: 1
Joined: Sat Jul 13, 2013 1:25 pm

Re: P0456

Post by Daveja50 » Mon Jul 09, 2018 1:35 pm

I had the same problem with my 2013 Taurus Limited: 3.5 L engine, 34K miles.

Took it to Autozone for a error analysis and they recommended replacing the filler tube assembly (about $300). I sprayed WD40 in the gas cap assembly then cleaned it but it didn't clear the error.

I then tested the purge valve and found it was leaking. Cleaned it with WD-40 and a Q tip. That cleared the error. A replacement valve is in the $30 price range so it may be better to replace rather than clean.

Dave

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