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Code P0456?

Tiny
JEFF BERGERON
  • MEMBER
  • 2003 DODGE NEON
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Check engine light came on just days before emissions test was due to get new tags.

Watched this video:

https://www.youtube.com/watch?v=UBCxrizsN1E&t=53s

Decided to call a mobile mechanic to replace it turns out it is not like the video the location is under the battery. He replaced it and check engine was off and passed emissions test after two weeks of driving one morning I was heading out to shop light is back on and same code comes up, can this canister be accessed from underneath with the front end on ramps?
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Tuesday, March 28th, 2023 AT 10:50 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,562 POSTS
Thanks for the video, it helps. Code P0456 indicates that a leak in the evaporative (EVAP) emission system has been detected so it could just be the gas cap with a bad O ring. I would check all other lines from the tank to the canister and to the engine. I have included diagrams of the hoses you should check. Check out the images (below). Please let us know what happens.
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Wednesday, March 29th, 2023 AT 11:10 AM
Tiny
JEFF BERGERON
  • MEMBER
  • 5 POSTS
Probably will be a week or more before I can get to it because we will be getting a roof replacement soon, thanks for your help. Is it common for the purge valve to cause the code as well?
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Wednesday, March 29th, 2023 AT 3:22 PM
Tiny
KEN L
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It will if there is a connection problem and only sometimes if there is a mechanical error. Good luck with your roof.
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Thursday, March 30th, 2023 AT 1:20 PM
Tiny
JEFF BERGERON
  • MEMBER
  • 5 POSTS
The code went away after the emission vapor canister was replaced, and the Neon passed emissions just over two weeks later the same code came up when the speedometer passed the 150,000 mark and now check engine light is back, does that happen at 150,000 as a reminder for maintenance?
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Tuesday, April 25th, 2023 AT 8:22 AM
Tiny
KEN L
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Not really, there sound like there is another code. Please run the scan to see if it is the same one and if not, please start a new question.
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Wednesday, April 26th, 2023 AT 9:17 AM
Tiny
JEFF BERGERON
  • MEMBER
  • 5 POSTS
Last tank full I added one bottle of Tectron, had to fill up again two days ago nothing added and now the light is out, weird? The gas cap pressure test they did during emissions test showed it was fine, maybe the car is haunted.
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Thursday, May 4th, 2023 AT 2:56 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,562 POSTS
It could be a sticking EVAP purge solenoid, here is the location so you can change it out if the problem arises again. Check out the images (below). Please let us know what happens.
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Friday, May 5th, 2023 AT 9:59 AM

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