06-29-2020, 01:37 AM | #1 |
Drives: 16’ m6 Ss Join Date: Apr 2020
Location: Utah
Posts: 4
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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 |
06-30-2020, 08:08 PM | #2 |
Drives: 2016 Camaro Join Date: Oct 2017
Location: Texas & Uncle Sam's Choice
Posts: 123
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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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2024 Chevrolet 3500HD Z71, LTZ, 4x4, 6.6 ltr. L5P long-bed.
2016 Camaro 2SS Six-speed, Hotchkis sway bars, Eibach .750" drop springs, Mamo throttle body, E85, BMR stuff. 2006 Quicksilver 6-speed GTO ERL LS3-430, All-Pro 285cc heads, 262/273 .758/.742 116+3 cam, Sheet-metal Intake, 70lb Siemens injectors, SLP, GMM Ripshifter, QA1 Coil-overs front and rear, nylon suspension bushings, Hotchkis, RPM Trans, SPEC twin clutch, SpinTech, Kooks 1 7/8 -2.0", BMR drive train, Kaaz 3.91, Lingenfelter CAI, Baer brakes, mini-tubs, E85. |
06-30-2020, 10:07 PM | #3 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,700
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Quote:
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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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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07-01-2020, 06:28 AM | #4 |
Hot Camaro
Drives: '20 2SS Convertible 6MT Join Date: May 2020
Location: CT
Posts: 3,532
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07-01-2020, 06:45 PM | #5 | |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,196
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Quote:
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07-01-2020, 07:46 PM | #6 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,700
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Quote:
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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07-09-2020, 03:25 PM | #7 |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,196
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P0300 (pending) and P0420 (permanent), I need to adjust the misfire threshold table, I am thinking about just maxing it out below 1000 rpms, since in theory I should only have misfire trouble with my cam below 1000 rpms since thats the only place I can feel it run rough.
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07-17-2020, 06:40 PM | #8 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,700
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Quote:
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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07-17-2020, 08:03 PM | #9 |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,196
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No headers just cam and heads, but I did drop a socket into the headers when I was putting in my cam and it started ratteling. So eventually I pulled the downpipe back out and got it out, but when looking down into the primary cat on the downpipe I could see the driver's side header was cracked. Maybe it was enough to cause the code to come up and maybe that why my unburnt fuel smell is so bad given that the cam I installed only has 4 degrees of overlap and is not that big 228/236?
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07-17-2020, 08:15 PM | #10 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,700
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Quote:
__________________
2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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