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Still getting the p0430 code

Still getting the p0430 code

Postby Jbenedetto34 [OP] » Jan 12 2021, 12:28am

Ok so here it goes. My check engine light has been coming on for about a year. It will go off after about a week. It's the p0430 code every time. So I've been trying everything to get this fixed but I'm at my wits end. I've replaced the cats, I've put new downstream o2 sensors, new dual cat back exhaust, New plugs and wires. What am I missing. What else can it be? Please help. Truck is Sierra 1500 slt. 130k miles. Has k&n cold air intake.

Please please please help.
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Re: Still getting the p0430 code

Postby GBSierraSLE » Jan 12 2021, 12:35am

According to this site https://www.engine-codes.com/p0430_chevrolet.html one of the things that can cause that code is an intake air leak. I would get rid of the K&N. It really does nothing for you anyway.
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Re: Still getting the p0430 code

Postby Chevy-SS » Jan 12 2021, 2:05am

Yeah, I would also say to ditch the K&N. When I bought my current Silverado, it had K&N setup on it, which I promptly removed and replaced with factory CAI.

And if the K&N filter is oiled (which they usually are) then some of that oil works its way onto the MAF sensor, which is just downstream of the air filter. The MAF is an incredibly sensitive piece of kit and will always respond negatively to contamination. It's possible your whole problem is a dirty MAF. You may want to clean the MAF, which involves removing it (handling it gently and carefully) and spraying it numerous times with the appropriate MAF cleaner, let it dry, and re-install (correctly oriented so that air flows over the sensor in the right direction!). That might fix you up.
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Re: Still getting the p0430 code

Postby B52Bombardier1 » Jan 12 2021, 2:02pm

Yep. Jettison the CAI. It can cause chaotic air at the MAF which makes the PCM think it needs to change the fueling.

Take a look at your Bank 1 and Bank 2 Long and Short Term Fuel Trims to see whats going on here.

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Re: Still getting the p0430 code

Postby Jbenedetto34 [OP] » Jan 17 2021, 4:52pm

Put cai back in and cleaned the maf. Still the same p0430 code.
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Re: Still getting the p0430 code

Postby esox07 » Jan 17 2021, 5:08pm

Did you clear the code with the code reader after you put the CAI back in?
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Re: Still getting the p0430 code

Postby Jbenedetto34 [OP] » Jan 17 2021, 5:10pm

Yes. Drive around Ang or another 150 miles on too
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Re: Still getting the p0430 code

Postby Jbenedetto34 [OP] » Jan 21 2021, 8:39pm

I meant I put the factory intake back in and same problem. Code still showing up. I just replaced the 2 upper O2 sensors now so all O2 sensors are replaced. I cleaned the MAF.

Dealership suggest flashing the ecm. Any thoughts? I am just skeptical as to keep throwing money that isn't doing anything but replacing good working parts.

I really dont know what to do at this point.
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Re: Still getting the p0430 code

Postby Chevy-SS » Jan 21 2021, 9:51pm

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Re: Still getting the p0430 code

Postby Silverado2021 » Jan 26 2021, 4:49am

GBSierraSLE wrote:According to this site https://www.engine-codes.com/p0430_chevrolet.html one of the things that can cause that code is an intake air leak. I would get rid of the K&N. It really does nothing for you anyway.
hers what I thinkmis happening. No offensev to anyone...but the K&N open air filter may be the culprit. no offensive to anyone but the k&n open air filter may be the problem. after you fix or remove the k&n filter issue. your engine computer codes have to be reset for that error code not to return. a good gm service evh / dept can do that for a small fee.. one time I had an old F*** tarus. the engine check light would not go out. everything was checked and replaced. passed im without a problem..check engine light still on. I put a piece of black elect tape over the light. problem fixed.
ps. a higher calibrated open filter system for the gm trucks are: www.coldairinductions.com
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