P0456 - MBWorld.org Forums

Mar 6, 2020 | 05:25 PM

WinterPark321

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Joined: Jul 2016

Posts: 112

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From: Orlando, Florida

2009 E550, 2011 GL550, 2013 GL550

P0456

I was driving home today and the "check engine" light appeared on the dash. Scanned it and got the code P0456:
Has anyone experienced this code?

Last edited by WinterPark321; Mar 6, 2020 at 08:39 PM.

Mar 7, 2020 | 09:48 PM

chassis

Out Of Control!!

Joined: Sep 2018

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From: unbegrenzt

2017 GLE350 4MATIC

Possibly a fuel fill cap not tightened sufficiently?

Mar 7, 2020 | 10:58 PM

WinterPark321

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Member

Joined: Jul 2016

Posts: 112

Likes: 24

From: Orlando, Florida

2009 E550, 2011 GL550, 2013 GL550

I checked fuel cap and it was tightened.....

Mar 8, 2020 | 09:34 AM

Miguk_Saram

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Joined: Apr 2004

Posts: 625

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From: Germantown, MD

'07 GL450

Quote:

Originally Posted by WinterPark321

I checked fuel cap and it was tightened.....

Check again.

Clean the fuel cap gasket with silicon grease (or replace it); and the metal contact on the vehicle with petroleum jelly. Wipe dry, and ensure it is free of any rubber debris. Do not clean the gasket with petroleum jelly since it will eventually eat through the rubber.

When your fuel cap is properly sealed, you should hear a bit of a suction sound when you release the cap to refuel (this is indicative of proper vacuum),

It will take a couple of cold starts for the MIL to reset.

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