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GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

Code P0455

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Old Apr 1, 2021 | 08:29 PM
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2012 gl450
Code P0455
Hello I was wondering if someone could help me today my engine light went on and the code came out P0455 could someone please tell me what that means thank you pete
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Old Apr 1, 2021 | 08:48 PM
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Did it come on after fueling up, and is your gas cap on secure?

9/10 times this is the culprit for 0455 - generically called a large evap leak.
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Old Apr 2, 2021 | 10:01 AM
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Ok it just came up yesterday while I was driving I got gas a couple of days ago. What should I do I tightened the gas cap will the light eventually go away?
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Old Apr 2, 2021 | 11:50 AM
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Originally Posted by Pmanc
Ok it just came up yesterday while I was driving I got gas a couple of days ago. What should I do I tightened the gas cap will the light eventually go away?
Often 0455 is the evap valve, located on the filler neck. If you are handy, you can remove, disassemble, clean, and grease with silicone, and you will not have the problem anymore.

If you are not handy, you can buy a replacement valve. They aren't very expensive.

If you are not handy, and are broke, you can put tape over the CEL.

This is why you should never top off. The liquid gasoline washes away the grease and makes the rubber seals stop working.
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Old Apr 3, 2021 | 04:11 PM
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OK I replaced it with a new gas cap the light is still on will it eventually go away
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Old Apr 3, 2021 | 04:47 PM
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Get yourself a bluetooth OBD adapter. Then you can install Torque on your phone, and reset those codes.

I was on a road trip and found it annoying enough that the CEL would come on (cat converter errors) and figured out how to reset them while I'm driving.

If you had a problem with the gas cap, you probably would see it in the condition of the o-ring. Odds are you need to service the evap control valve as I described earlier.
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Old Apr 5, 2021 | 10:32 PM
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Good news I did a lot of driving yesterday and the light just went away Perhaps it was the gas cap. Thanks everyone for your help 👍🏻
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Old Apr 6, 2021 | 09:25 AM
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If the condition that triggered the CEL no longer persists it will go away after three cold to hot cycles.
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Old Apr 6, 2021 | 06:47 PM
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Originally Posted by eric_in_sd
Often 0455 is the evap valve, located on the filler neck. If you are handy, you can remove, disassemble, clean, and grease with silicone, and you will not have the problem anymore.

If you are not handy, you can buy a replacement valve. They aren't very expensive.
Could be what is wrong with mine. When I refill, it won't start until it sits for some time. Wouldn't happen to have a part number? Do you access via the right wheel liner?
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Old Oct 6, 2025 | 09:49 PM
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Originally Posted by BlownV8
Could be what is wrong with mine. When I refill, it won't start until it sits for some time. Wouldn't happen to have a part number? Do you access via the right wheel liner?
Did you find the root cause? I seem to have the same issue, it will go away for a while and then come back up after the fuel tank goes to around 75% I have already replaced the fuel cap, purge valve and the whole vapor canister as the smoke test showed a leak on its valve but the check engine is still there times to times.
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Old Yesterday | 10:33 PM
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Just FYI … you can google Mercedes P0455 (or any other code you encounter) and get real informationhttps://search.yahoo.com/search?p=me...+p0455&fr=ipad



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