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Old 01-14-2020, 03:50 PM   #1
neurotopia
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2005 L-Series 3.0L Sedan
2002 L-Series 2.2L Sedan
Default 05 L300 ECM codes

Getting a P0440 and a P0455. Minor loss of fuel economy and some slight stumbling on acceleration (not consistent). Any ideas? I'm gonna start by looking for damage to the fuel filler neck assembly. It was pretty corroded last I checked and might've cracked.

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Old 01-14-2020, 04:24 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: 05 L300 ECM codes

P0440 - https://www.obd-codes.com/p0440

P0455 - https://www.obd-codes.com/p0455

These two error codes points to several areas related to the evap system. Keep a broad perspective while checking things. Some may or may not be obvious.

If this car resides in the rust belt states, check for severe corrosion on the smaller vent pipe running next to the fuel feed pipe between the fuel filler and tank. My L300 popped either the P0440 or other code indicating a small evap system leak. I replaced the gas cap but that didn't fix it as time passed. I think P0455 occurred next and checking the service manuals for evap system piping and components led me to the fuel pipe and adjacent vent pipe. The vent pipe corroded from winter salting until breaking at a bracket mount, allowing fuel vapors to escape. The fuel and evap pipe run between the fuel fill door to the tank and exposed to road salts. The fuel and evap system are sealed when the engine's running as evap system tests are performed during every engine run. Fuel vapor pressures and vacuum are tested to determine if the evap system is intact, leaking or if electrically operated valves are faulty.

I posted my dilemma in a thread a few years ago with snapshots of salt corrosion.

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Old 01-14-2020, 08:21 PM   #3
neurotopia
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2005 L-Series 3.0L Sedan
2002 L-Series 2.2L Sedan
Default Re: 05 L300 ECM codes

Thanks for the info. My mistake, the first code was P0442, but I'm assuming that doesn't really change the calculus any.

Quote:
Originally Posted by fdryer View Post
P0440 - https://www.obd-codes.com/p0440

P0455 - https://www.obd-codes.com/p0455

These two error codes points to several areas related to the evap system. Keep a broad perspective while checking things. Some may or may not be obvious.

If this car resides in the rust belt states, check for severe corrosion on the smaller vent pipe running next to the fuel feed pipe between the fuel filler and tank. My L300 popped either the P0440 or other code indicating a small evap system leak. I replaced the gas cap but that didn't fix it as time passed. I think P0455 occurred next and checking the service manuals for evap system piping and components led me to the fuel pipe and adjacent vent pipe. The vent pipe corroded from winter salting until breaking at a bracket mount, allowing fuel vapors to escape. The fuel and evap pipe run between the fuel fill door to the tank and exposed to road salts. The fuel and evap system are sealed when the engine's running as evap system tests are performed during every engine run. Fuel vapor pressures and vacuum are tested to determine if the evap system is intact, leaking or if electrically operated valves are faulty.

I posted my dilemma in a thread a few years ago with snapshots of salt corrosion.

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Old 01-14-2020, 09:26 PM   #4
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2003 L-Series 3.0L Sedan
Default Re: 05 L300 ECM codes

There are so many codes related to the evap system. P0442 (small evap system leak) is another one and may be the first one occurring in my L300 before turning into P0455 (large evap system leak). Here's my tale of woe; http://www.saturnfans.com/forums/sho...d.php?t=222339

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Old 01-14-2020, 09:48 PM   #5
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2003 L-Series 3.0L Sedan
2002 L-Series 3.0L Sedan
Default Re: 05 L300 ECM codes

P0442 SATURN - Evaporative Emission Control System Leak Detected Small Leak

Read more: https://www.autocodes.com/p0442_saturn.html
P0442 SATURN Possible Causes Missing or loose fuel cap Incorrect fuel filler cap used Fuel filler cap remains open or fails to close Foreign matter caught in fuel filler cap EVAP canister or fuel tank leaks EVAP system hose leaking Fuel tank leaking

Read more: https://www.autocodes.com/p0442_saturn.html

P0455 SATURN - Evaporative Emission Control System Leak Detected Gross Leak

Read more: https://www.autocodes.com/p0455_saturn.html

P0455 SATURN Possible Causes Missing or loose fuel cap Incorrect fuel filler cap used Fuel filler cap remains open or fails to close Foreign matter caught in fuel filler cap EVAP canister or fuel tank leaks EVAP system hose leaking Fuel tank leaking

Read more: https://www.autocodes.com/p0455_saturn.html


I would say look at your fuel filler neck and see if the small line return isn't rusted out this can also cause the error codes as well. Saturn are known to rust this line. So look there as well-you will have to jack the Saturn and also remove the right rear tire to remove the Wheel well guard to see these lines. But my money is if you never changed or look at this line then it's rusted out. I had two Saturn a LS2 '00 with the return line evaporator rusted out and the same with my 2nd Saturn L300 '02. Once I replaced the fuel filler neck that fixed the error code.

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Old 01-14-2020, 11:51 PM   #6
neurotopia
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2005 L-Series 3.0L Sedan
2002 L-Series 2.2L Sedan
Default Re: 05 L300 ECM codes

Thanks for the info.

Yeah I know about those, I replaced the assembly on my daughter's last year. I figure that's the most likely place to begin, I know it was also highly rusted on my car. Sounds like it is most likely also the end point.

I replaced the rear struts and some of the suspension bushings a couple weeks ago so it is quite likely that I managed to crack it during that time. Well, might as well just swap it out cuz it's gonna go at some point....

Quote:
Originally Posted by Russet View Post
P0442 SATURN - Evaporative Emission Control System Leak Detected Small Leak

Read more: https://www.autocodes.com/p0442_saturn.html
P0442 SATURN Possible Causes Missing or loose fuel cap Incorrect fuel filler cap used Fuel filler cap remains open or fails to close Foreign matter caught in fuel filler cap EVAP canister or fuel tank leaks EVAP system hose leaking Fuel tank leaking

Read more: https://www.autocodes.com/p0442_saturn.html

P0455 SATURN - Evaporative Emission Control System Leak Detected Gross Leak

Read more: https://www.autocodes.com/p0455_saturn.html

P0455 SATURN Possible Causes Missing or loose fuel cap Incorrect fuel filler cap used Fuel filler cap remains open or fails to close Foreign matter caught in fuel filler cap EVAP canister or fuel tank leaks EVAP system hose leaking Fuel tank leaking

Read more: https://www.autocodes.com/p0455_saturn.html


I would say look at your fuel filler neck and see if the small line return isn't rusted out this can also cause the error codes as well. Saturn are known to rust this line. So look there as well-you will have to jack the Saturn and also remove the right rear tire to remove the Wheel well guard to see these lines. But my money is if you never changed or look at this line then it's rusted out. I had two Saturn a LS2 '00 with the return line evaporator rusted out and the same with my 2nd Saturn L300 '02. Once I replaced the fuel filler neck that fixed the error code.

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