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Old 06-29-2020, 01:37 AM   #1
LTjuan_16
 
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Drives: 16’ m6 Ss
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P0420/p0430 Permanent codes stumped

Hey yall,
I’ve been doing drive cycle after drive cycle to clear these only two codes I have left after long tubes install. My question is in hpt can I set the DTC to no error reported and leave the ses enabled box checked? Will that help or do nothing for me? I’ve set the tune back to stock and ran it for the last 300 miles and it’s done nothing. They are preventing me from passing emissions and I’ve searched the forums with no luck so any help I can get is much appreciated y’all thanks!



2016 Camaro SS
Kooks Longtube Headers with green cats
MBRP cat back
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Old 06-30-2020, 08:08 PM   #2
GTO_Gregory
 
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Here's my two-cents.

1. In HPTuners VCM Scanner connect to the vehicle while running and look for errors. If any are listed, click on the little engine in the tool bar with the pop out label of "Diagnostics and Info." A small window will open with the DTC (fault(s) listed). Highlight the items and press the red X at the top of the menu. This will erase the fault and give you a blank slate. Scan again and see if you get the same faults. If you do, erase the faults again, then make the suggested change below to turn off the sensor.

2. Leaving a check in the box keeps the sensor enabled. Hence, it will report something.

3. If anything set the Error Mode item to "No MIL Light." This will turn off any "check engine" light from the fault.

4. Check the HPTuners forum to verify this, but you should be okay.

If Utah doesn't sniff your exhaust for carbons you should be okay.

MIL stands for Malfunction Indicator.

P0420 Catalyst System Efficiency Below Threshold (Bank 1)

p0430 Catalyst System Efficiency Below Threshold (Bank 2)
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Old 06-30-2020, 10:07 PM   #3
Joshinator99

 
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Drives: 2017 Camaro 2SS A8
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Quote:
Originally Posted by GTO_Gregory View Post
Here's my two-cents.

1. In HPTuners VCM Scanner connect to the vehicle while running and look for errors. If any are listed, click on the little engine in the tool bar with the pop out label of "Diagnostics and Info." A small window will open with the DTC (fault(s) listed). Highlight the items and press the red X at the top of the menu. This will erase the fault and give you a blank slate. Scan again and see if you get the same faults. If you do, erase the faults again, then make the suggested change below to turn off the sensor.

2. Leaving a check in the box keeps the sensor enabled. Hence, it will report something.

3. If anything set the Error Mode item to "No MIL Light." This will turn off any "check engine" light from the fault.

4. Check the HPTuners forum to verify this, but you should be okay.

If Utah doesn't sniff your exhaust for carbons you should be okay.

MIL stands for Malfunction Indicator.

P0420 Catalyst System Efficiency Below Threshold (Bank 1)

p0430 Catalyst System Efficiency Below Threshold (Bank 2)
If you uncheck the SES light, your monitors will never show ready. That’s how you fail in states that plug into your ALDL port. You have to leave it checked, but set the drop down menu to “No Error Reported”.

Permanent codes will not go away on ‘17-up cars unless you’ve fixed the problem. To avoid P0420/P0430, you must set those to “No Error Reported”... *BEFORE* you install the headers! Otherwise, the permanent codes will not go away, even with a full ECM write. You would have to reinstall the OEM cats, wait for the permanent codes to clear, then set it to “No Error Reported”, then reinstall the headers. If someone is more knowledgeable about this than me, please feel free to chime in. But living in a smog nazi state (MA) has taught me the hard way. Lol

My understanding is that 2016 cars can shut the codes off afterward and just do a full ECM write, and that will erase the permanent codes. But I cannot verify that as I have a ‘17.
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Old 07-01-2020, 06:28 AM   #4
ember1205
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Quote:
Originally Posted by GTO_Gregory View Post

MIL stands for Malfunction Indicator.
MIL = Multifunction Indicator Lamp

(I suspect your brain was ahead of your typing and you skipped it without realizing.
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Old 07-01-2020, 06:45 PM   #5
cmitchell17
 
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Quote:
Originally Posted by Joshinator99 View Post
If you uncheck the SES light, your monitors will never show ready. That’s how you fail in states that plug into your ALDL port. You have to leave it checked, but set the drop down menu to “No Error Reported”.

Permanent codes will not go away on ‘17-up cars unless you’ve fixed the problem. To avoid P0420/P0430, you must set those to “No Error Reported”... *BEFORE* you install the headers! Otherwise, the permanent codes will not go away, even with a full ECM write. You would have to reinstall the OEM cats, wait for the permanent codes to clear, then set it to “No Error Reported”, then reinstall the headers. If someone is more knowledgeable about this than me, please feel free to chime in. But living in a smog nazi state (MA) has taught me the hard way. Lol

My understanding is that 2016 cars can shut the codes off afterward and just do a full ECM write, and that will erase the permanent codes. But I cannot verify that as I have a ‘17.
Yeah I wish I would have thought about this before I installed my cam, but I didn't expect my cam to be as bad on unburnt hydrocarbons as it is, my guess is that it's just got too much overlap and let's too much unburnt fuel out the exhaust valve, but it still dosent make sense that after calculating my exhaust valve closing and even with my injection timing the injector should be spraying only after it's closed. So I guess it also could be poor combustion from having to much exhaust gas in the cylinder on the compression stroke that's interfering with complete combustion.
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Old 07-01-2020, 07:46 PM   #6
Joshinator99

 
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Quote:
Originally Posted by cmitchell17 View Post
Yeah I wish I would have thought about this before I installed my cam, but I didn't expect my cam to be as bad on unburnt hydrocarbons as it is, my guess is that it's just got too much overlap and let's too much unburnt fuel out the exhaust valve, but it still dosent make sense that after calculating my exhaust valve closing and even with my injection timing the injector should be spraying only after it's closed. So I guess it also could be poor combustion from having to much exhaust gas in the cylinder on the compression stroke that's interfering with complete combustion.
What codes are you getting?
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2017 Chevy Camaro 2SS A8 Whipple 8.00/3.50, Mast Motorsports Black Label LT1 heads, CamMotion custom blower cam, Katech VVT & AFM delete covers, Rotofab Big Gulp, Katech 103mm TB, DW400 in tank pump, Johnson 2110R lifters, GPI forged pistons & rods, LT4 HP fueling, AWE Touring CB with PLPs, Katech 160 TS, DSX E85, GForce 3.5” Al DS, GForce Outlaw axles, 2” ceramic coated Dynatech headers w/3” cats, Velossa Tech RA, MM Wild CC, LPE check valve
2019 Toyota Sequoia Limited 4WD (daily driver)
2018 Alfa Romeo Giulia Ti Sport Q4 (hers)
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