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dabber
Member
Date registered: Oct 2012
Location: NJ
Vehicle(s): 2002 G500
Posts: 18
| CEL P0455
I've been told that the code refers to a vap leak.
It started with the loose filler cap, then CEL. I've reset the code about 3 times since January. A new gas cap (during summer 13', returned in fall) helped temporarily but now it comes back every other week it seems.
People that had similar issues seemed to try and replace some hoses or maybe the purge valve, but most cases the CEL came back. I heard of bent valves stuck in an open position near the back well of the (l) or (r) tire, but i cannot clarify.
So I'm here just looking for the best possible advice because this seems like an extremely vague error code and I want try my best not to go on a huge string of unnecessary part replacements.
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dabber
Member
Date registered: Oct 2012
Location: NJ
Vehicle(s): 2002 G500
Posts: 18
| Re: CEL P0455
Edit gonna go through this list with the mechanic
a) the cap is off
b) the EVAP purge solenoid is not sealing (under the hood),
c) the lines are broke or disconnected
d) the canister is cracked, or,
e) the EVAP canister vent valve (behind the rear passenger wheel, in the canister) is not working properly.
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Titus Pullo
Elite Veteran
Date registered: May 2007
Location: Ottawa, ON, Canada
Vehicle(s): '90 Wolf 240GD, '06 G270 CDI.
Posts: 1010
| Re: CEL P0455
Got P0453 - purge solenoid stuck open. Where is the solenoid located? |
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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| Re: CEL P0455
It is at the back of the driver's side engine cylinder bank between the engine and the firewall, just to the right of the brake booster and above the exhaust manifold. The heat from being in this location causes the valve to deteriorate and fail.
 (Purge Valve.JPG)
Attachments
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 Purge Valve.JPG (210KB - 0 downloads)
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| Re: CEL P0455
Floobydust - 1/21/2017 6:57 PM
It is at the back of the driver's side engine cylinder bank between the engine and the firewall, just to the right of the brake booster and above the exhaust manifold. The heat from being in this location causes the valve to deteriorate and fail.
That sure looks a lot like the Crankshaft Position Sensor. |
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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| Re: CEL P0455
DUTCH - 1/21/2017 7:03 PM
That sure looks a lot like the Crankshaft Position Sensor.
I know it's the purge valve because I recently replaced it. It does look a lot like the CPS in the photo, but you can see the blue vacuum line and its elbow going into one side of the valve. The CPS is actually under the purge valve in the view captured in this photo.
Edited by Floobydust 1/22/2017 10:18 AM
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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| RE: CEL P0455
Well, no good deed goes unpunished - my G just threw a P0455 (gross leak) code today (after a gas cap loose warning message). Since I replaced the purge valve, the gas cap, and the canister vent valve last spring when I had the minor leak code, it will be interesting to see what this turns out to be. I'm betting on either the pressure transducer or a cracked charcoal canister. Anyone have any other thoughts?
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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| RE: CEL P0455
I think I have found this issue with my leak - the hose (#70 in the EPC diagram) that connects the fuel filler neck to the fuel shut off valve (#5, sometimes referred to as the roll over valve) is loose at the valve. The problem I'm having is, how is the Sam H do you get at the hose/vale to change the clamp? Is there an access door somewhere? I took the inner fender well off and took the charcoal canister out and with that you can see the hose and valve back in there, but it is so tight I can't really get at it to change the clamp. I was also going to change the pressure sensor as well, but that is under the hose and even more difficult to get at. Has anyone done either the hose or the pressure sensor? Does anyone have any suggestions.
Thanks!
 (fuel shut off valve EPC.JPG)
Attachments
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fuel shut off valve EPC.JPG (167KB - 4 downloads)
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| RE: CEL P0455
Can you access it from the inside of the truck by removing the inner panel(s)? |
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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| RE: CEL P0455
The affected parts are located within the right rear fender hump (as viewed from the inside) so they are below the removable plastic interior panel. Is it possible that there is an access panel under the carpet that is glued to the fender well? The left side houses the CD player and there are several relays behind that, so there is some precedent. |
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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| RE: CEL P0455
DUTCH - 2/7/2017 8:51 PM
Can you access it from the inside of the truck by removing the inner panel(s)?
I checked today and there is no access to that area from inside the truck.
My computer with the WIS on it it broken so I can't look it up. It is probably the same procedure as replacing the evap pressure sensor. Does anyone have the procedure they can post?
Thanks!
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djdinaz
Extreme Veteran
Date registered: Jun 2007
Location: Arizona
Vehicle(s): 03 G55
Posts: 439
| Re: CEL P0455
Unfortunately, the WIS docs are vague under group '47 Fuel System'. The only R&R docs deal with dropping the tank, removing the charcoal canister (which lists nothing more than a couple steps to remove fender liner, remove hoses and unbolt it), removing the filler neck (same as the canister - remove the fender liner, unhook the hoses and remove), Fuel pump (through the center port hole in the rear compartment), and swapping the venting valve (it's found inside the cabin under the carpet on the right).
There is nothing specific for pressure sensor or for fuel shutoff valve.
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BlueG
Elite Veteran
Date registered: Aug 2009
Location: DC
Vehicle(s): 2003 G500
Posts: 714
| Re: CEL P0455
DUTCH - 1/21/2017 7:03 PM
Floobydust - 1/21/2017 6:57 PM
It is at the back of the driver's side engine cylinder bank between the engine and the firewall, just to the right of the brake booster and above the exhaust manifold. The heat from being in this location causes the valve to deteriorate and fail.
That sure looks a lot like the Crankshaft Position Sensor.
Crank position sensor is on the bellhousing and deep in there. In fact I believe when I had to replace mine you were the one who posted and told me that! The other tip I got was to let the engine be stone cold to replace the crank position - glad that tip was stressed.
I believe I had that code under warranty. If I am not mistaken it was a software update that I lacked. Mine was flashing the low fuel light (in red if im remembering correctly). |
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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| Re: CEL P0455
Thank you for the detailed information, djdinaz. It looks like there is going to be some making it up as I go along on this.
I am curious about the the vent valve located inside the cabin. When you say it is under the carpet, do you mean the carpet on the floor of the rear area or the carpet that is glued to the right rear fender well? I peeled the glued on carpet back and there is no valve or access panel that I can find underneath it.
Also, does the WIS show that the filler neck is bolted on and if so, how many bolts does it show (I can't see any, but it does seem to be firmly attached).
Thanks again! |
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djdinaz
Extreme Veteran
Date registered: Jun 2007
Location: Arizona
Vehicle(s): 03 G55
Posts: 439
| RE: CEL P0455
Here's a pic of the vent valve from the WIS. By all appearances, it looks to be under the side lining above the fender hump. Carpet in the picture is probably the wheel well hump and NOT the floor.
Also attached is the doc for the fuel neck. Like most WIS docs, the instructions for removal look to be slightly abridged...
Edited by djdinaz 2/10/2017 9:38 AM
 (vent_valve.jpg)
Attachments
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vent_valve.jpg (120KB - 6 downloads)
AR47.10-P-7542GR.pdf (488KB - 12 downloads)
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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| RE: CEL P0455
Thank you very much, djdinaz! Even though the WIS info seems to be based on non-MBUSA trucks it gives me the general direction that I need to go to get at it.
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Titus Pullo
Elite Veteran
Date registered: May 2007
Location: Ottawa, ON, Canada
Vehicle(s): '90 Wolf 240GD, '06 G270 CDI.
Posts: 1010
| Re: CEL P0455
I got a new sign of something going wrong with the emission system - while driving yesterday a red message suddenly came on the screen out of nowhere, saying 'gas cap open'. No CEL. Pulled over, turned off the engine, checked the gas cap (closed tight of course), started again, no message and did not came any more. Any ideas where to start from?
BTW, the P0453 code did not came back since I erased it 2-3 weeks ago. |
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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| Re: CEL P0455
In practice I have found that the Evap system on the G can sometimes "glitch" where you get an error once in a great while, but there is no real fault. In your case, with two different Evap errors I would tend to think there is indeed a problem somewhere.
The OBDII Evap test will trigger the "gas cap warning" message (along with flashing the low fuel light) the first time it finds a large leak. If a second test finds a large leak within a certain number of drive cycles from the first one, it will display the gas cap message again and set a P0455 code which will turn on the CEL light. If this happens and you have already replaced the purge valve, I would suspect either the gas cap seal or the canister vent valve (number 140 in the diagram I posted). The only real way to diagnose, however, other than by trial and error, is to use a smoke machine which would involve a shop.
Edited by Floobydust 2/16/2017 7:10 PM
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NHDave
Extreme Veteran
Date registered: Dec 2013
Location: Seacoast NH.
Vehicle(s): 2004 AMG
Posts: 464
| Re: CEL P0455
Thank you Floobydust and all, watching this post!
Carry on. |
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