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Gatores

2003 Silverado Check Engine

7 posts in this topic

I had a check engine come on over the weekend and checked this morning. Truck runs fine, but the code came back P0430 on bank 2. The guys at advanced said most likely a catalytic converter getting plugged. Would that be right? Any insight would be greatly appreciated. It has 149,000 miles on a 5.3

Thanks

Rick

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Its ability to reduce emissions has decreased to the point where it no longer meets federal emissions standards.

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Its ability to reduce emissions has decreased to the point where it no longer meets federal emissions standards.

More times than not that is correct, as long as we are assuming that the O2 sensor itself is performing satisfactorily and there are no exhaust leaks. Its still worth a look at the readings of both upstream and downstream to see if they are functioning properly. wink

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I should have added there's a little more to it than reading a code.

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Is your gas cap on correctly. This has happened to me. Try redoing your gas cap and re start. If that is it it will go away in a minute.

G.C.

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This code has nothing to do with the gas cap. It is specific to the emissions system and even more specific to the integrity of one of the cats.

What you are referring to would be true if he was dealing with an Evaperative emissions code, which is a completely separate system. P0455 comes to mind which I think is Evap large leak detected which can pop up if you leave the gas cap off.

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Just an update. It was the passenger side catalytic converter. The local muffler shop did it for 200. Thanks for the responses.

Rick

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