CL-Class (W216) 2007-Present: CL 500, CL 600

Question about error P0456

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Old Jun 16, 2019 | 04:43 PM
  #1  
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1989 560 SEC, 2008 SL65 AMG
Question about error P0456

Hi all,

I bought a 07 CL600 with almost 100k miles with all history records and in very good shape. I picked it up from Philly 2 weeks ago and drove it home with no issues at all but last night driving back home the following light came on the dashboard:



I ran icarsoft mb2 for ECM module and the following came up:



I couldn't tell any difference in driving to be honest, but the question is what is that about? how can I fix it? and if it's safe to keep driving it in the meantime?

Thanks in advance,
Leo
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Old Jun 16, 2019 | 04:44 PM
  #2  
thphon's Avatar
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From: FL
1989 560 SEC, 2008 SL65 AMG
Oh didn't realize the pictures were so big, I'll keep that in mind next time
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Old Jun 16, 2019 | 11:41 PM
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'10 CL550, '12 GL550
You can just google these codes ...

https://www.carobdcode.com/p0456-mer...tem-small-leak
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Old Jun 17, 2019 | 02:17 AM
  #4  
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E250
Originally Posted by thphon
Hi all,

I bought a 07 CL600 with almost 100k miles with all history records and in very good shape. I picked it up from Philly 2 weeks ago and drove it home with no issues at all but last night driving back home the following light came on the dashboard:


I ran icarsoft mb2 for ECM module and the following came up:

I couldn't tell any difference in driving to be honest, but the question is what is that about? how can I fix it? and if it's safe to keep driving it in the meantime?

Thanks in advance,

For best OBD scan tools click here

Leo
Hi Leo.

Start with the obvious: the fuel tank cap. Check if it is tight enough, and also check if the gasket is intact.
After that, you can check the EVAP lines for cracks.

However, small leak can be hard to trace. This is where smoke generator helps, as you fill the system with smoke and see where it goes out.
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Old Jun 17, 2019 | 11:05 AM
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1989 560 SEC, 2008 SL65 AMG
thanks for the link, I'll start using it
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Old Jun 17, 2019 | 11:10 AM
  #6  
thphon's Avatar
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1989 560 SEC, 2008 SL65 AMG
Originally Posted by GabrielMacht
Hi Leo.

Start with the obvious: the fuel tank cap. Check if it is tight enough, and also check if the gasket is intact.
After that, you can check the EVAP lines for cracks.

However, small leak can be hard to trace. This is where smoke generator helps, as you fill the system with smoke and see where it goes out.
I'll check the fuel tank cap, I think the rest is beyond my level of expertise (which is almost nonexistent hehe). But thanks a lot, at least I know what the mechanic should look for.
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Old Jun 20, 2019 | 08:45 PM
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1989 560 SEC, 2008 SL65 AMG
Originally Posted by thphon
I'll check the fuel tank cap, I think the rest is beyond my level of expertise (which is almost nonexistent hehe). But thanks a lot, at least I know what the mechanic should look for.
I checked the fuel tank cap and it looked ok. I cleared the codes and it was fine for a couple of days but when the fuel gauge got to half the light came on again. I just refilled the tank and cleared the codes again, just wondering if getting to half triggers a check.
But anyways I'll take it to the mechanic next week, at least I know I can drive in the meantime without any risks.
Thanks!
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