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Ron Z.
Ron Z., - Hyundai Tech -
Category: Hyundai
Satisfied Customers: 18966
Experience:  18+yrs experience. State Inspector and Hyundai Diagnostics
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Hyundai 2010 code 456 vent valve replaced code came back

Customer Question

Hyundai 2010 code 456 vent valve replaced code came back smoke test shows no leak
Submitted: 1 year ago.
Category: Hyundai
Expert:  Ron Z. replied 1 year ago.

May I have the model and engine size of this Hyundai?

Customer: replied 1 year ago.
2.4 elantra
Expert:  Ron Z. replied 1 year ago.

Great, thanks!

The P0456 is actually a fairly common Hyundai problem. The most common fail item here is the Purge Control Solenoid Valve. They're very well-known fail items. It's located on the driver's side, rear of the engine, just behind and below the throttle. Carefully inspect the vacuum lines for any cracks, holes or disconnections. Inspect the electrical connector and wire harness for any loose, broken or damaged wires. If the visual inspection checks ok, replacing the PCSV usually solves the problem. For an image view of the PCSV location, click here:

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Customer: replied 1 year ago.
gonna try will let you know thank you
Expert:  Ron Z. replied 1 year ago.

You should be all set. I've seen this all too many times. Glad I could be of some help. Please remember to leave a rating! Have a great day!

Expert:  Ron Z. replied 1 year ago.

Hi! I noticed this thread was still open and wanted to check-in and see how you made out. Was the PCSV the problem? Did you have any other questions?

Expert:  Ron Z. replied 1 year ago.