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Duramax 6600 Welcome to the Internet's first Duramax 6600 diesel discussion forum for the LB7, LLY, LBZ, LMM, LML, LGH & L5P RPO code engines. Tips on performance, fuel economy, troubleshooting and more.

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  #1  
Old 03-09-2019, 04:27 PM
chessy56 chessy56 is offline
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Default 2017 L5P with P20EE code

2017 Silverado, L5P w/81K miles. Starting to get code P20EE which suggests a "low catalyst efficiency". I can clear the code with my Edge and drive for a certain number of miles without the code reappearing- but, it eventually returns. I've seen some owners claim the #2 NOx sensor or the DEF injector may be the culprit.

Question: is there a problem driving this thing in the near term without major problems? I can force a "mobile regen" via my Edge, so I believe my DPF is being serviced. Maybe a flakey NOx sensor? A carboned/dirty DEF injector nozzle?

Where on the exhaust stream are these injectors and sensors physically mounted (any pics/diagrams) available? Any thoughts or suggestions?
Thanks!
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"Chessy56"
So. Milwaukee, WI
'01 2500HD, LB7, 440K miles
"Stock" engine. Dual fuel filtration system with Kennedy lift pump, BF Goodrich Commercial T/A Traction tires (sold to a dude from Texas- it's living a warmer life just fine down there now!).

'17 2500HD, L5P (Happy Birthday/Merry Christmas to me!!! Not excited about loan and insurance costs though...). Bone stock, 81K miles.

"Socialism is a philosophy of failure, the creed of ignorance and
the gospel of envy. Its inherent virtue is the equal sharing of misery."
Winston Churchill
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  #2  
Old 03-09-2019, 10:17 PM
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DmaxMaverick DmaxMaverick is offline
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The NOx sensor and DEF are not related to the "catalyst" monitoring. They deal with NOx alone. An O2 or temp sensor, or failed Cat is more likely. The sensors can read erroneously before they actually fail enough to cause complaints. Start by removing your electronic power mods (completely, not just disabled). Diagnostics with it/them in place will have you (and the PCM) chasing wild geese.
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  #3  
Old 03-10-2019, 02:55 PM
chessy56 chessy56 is offline
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For what it's worth, the P20EE code is no longer appearing and the check engine indicator has reset itself. I'm currently not reading any DTC codes. I recall having this failure long before I reached the first 30K miles. I had the dealer's tech look into this and there were no active codes for him to work from at that time either.

A temp or O2 sensor was mentioned- I've forced 2 "mobile regens" now (with my Edge) and the exhaust temps came up to what I've seen before. Problem appears to be hidden again, unless the sensors are indeed flaky.

Thanks Maverick!
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"Chessy56"
So. Milwaukee, WI
'01 2500HD, LB7, 440K miles
"Stock" engine. Dual fuel filtration system with Kennedy lift pump, BF Goodrich Commercial T/A Traction tires (sold to a dude from Texas- it's living a warmer life just fine down there now!).

'17 2500HD, L5P (Happy Birthday/Merry Christmas to me!!! Not excited about loan and insurance costs though...). Bone stock, 81K miles.

"Socialism is a philosophy of failure, the creed of ignorance and
the gospel of envy. Its inherent virtue is the equal sharing of misery."
Winston Churchill

Last edited by chessy56; 03-10-2019 at 02:56 PM. Reason: typo correction
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  #4  
Old 03-10-2019, 03:06 PM
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An off-the-cuff thought is an O2 sensor. Not necessarily failed or failing, but possibly being plugged. This has been an issue, often intermittent, since they showed up on vehicles. There's usually an underlying cause, such as a "rich" condition (as it applies to gassers), or overfueling (as it applies to Diesels with a failed charge-air system, or power mods). A completed regen may explain the disappearance, with the soot cooked out of the sensor. A sensor that's out of range, but not enough for the system to see it as a failed sensor, often causes the PCM to assume an erroneous condition. It doesn't mean that something is actually broken, only that the PCM isn't getting the data it expects. That's my best guess.
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  #5  
Old 03-11-2019, 08:50 AM
Kennedy Kennedy is offline
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Quote:
Originally Posted by chessy56 View Post
For what it's worth, the P20EE code is no longer appearing and the check engine indicator has reset itself. I'm currently not reading any DTC codes. I recall having this failure long before I reached the first 30K miles. I had the dealer's tech look into this and there were no active codes for him to work from at that time either.

A temp or O2 sensor was mentioned- I've forced 2 "mobile regens" now (with my Edge) and the exhaust temps came up to what I've seen before. Problem appears to be hidden again, unless the sensors are indeed flaky.

Thanks Maverick!
Are you monitoring soot levels?

Are you monitoring miles since last regen?
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  #6  
Old 03-11-2019, 03:48 PM
cabletech cabletech is online now
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There is a recall associated with P20EE on the 17 & early 18 L5P trucks. Have you had the recall (ECM/TCM programing) done? That code is related to an NOx issue. The programing also addressed some odd 2nd to 1st shifting issues. Also soot levels are in percentage, not grams of soot as was used on previous models.
FYI there are no oxygen sensors on the L5P diesel.

Jay
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  #7  
Old 03-14-2019, 06:14 PM
chessy56 chessy56 is offline
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I am not monitoring soot levels. I'd have to check my edge, but I don't recall seeing a PID for that (is that a monitored variable that is available on a Tech II or EFI Live?). And while I do see the mobile regen occurring on occasion, I have not been paying attention to the miles in between. Probably a good idea to be doing so.

As to the recall on the P20EE, I wasn't aware of any and logging into the MyChevy site, there's nothing listed for recalls on my '17 Silverado. However, I had been dogging the dealership on a P140B code. I was getting that code when driving in heavy rain or if my induction system ingested a bunch of snow. GM finally resolved that problem and the most recent flash supposedly covered several updates. The P20EE may have been one of the issues addressed.

I got the P20EE a couple of times when my truck was still under warranty, but the problem was always cleared by the time my dealer tech looked at it. Until recently, I hadn't had this code in nearly 60K miles.
Thanks guys!
Gary
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"Chessy56"
So. Milwaukee, WI
'01 2500HD, LB7, 440K miles
"Stock" engine. Dual fuel filtration system with Kennedy lift pump, BF Goodrich Commercial T/A Traction tires (sold to a dude from Texas- it's living a warmer life just fine down there now!).

'17 2500HD, L5P (Happy Birthday/Merry Christmas to me!!! Not excited about loan and insurance costs though...). Bone stock, 81K miles.

"Socialism is a philosophy of failure, the creed of ignorance and
the gospel of envy. Its inherent virtue is the equal sharing of misery."
Winston Churchill
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  #8  
Old 03-14-2019, 06:49 PM
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You should still be under warranty. Either the 100K Diesel engine warranty, or the emission system warranty (varies, depending on state and RPO).
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2014 Chevy Cruze Diesel - Fabulous car, no problems at all, but sold Nov. 2016 @ 55K miles.
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  #9  
Old 03-15-2019, 06:40 PM
chessy56 chessy56 is offline
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The dealership hosed me over $100 to have my PCM flashed a few weeks ago. I called Chevy customer disservice and bitched, as I thought the flash addressed a failure which involved the emission system- which I thought was covered under warranty until 5 yr/100K miles. They told me that reflashing the PCM was "not covered under warranty", given the 79K miles I had on the truck at that time. They're claiming they'll cover the drive train and any mechanical failures on the engine, but not reprogramming! I asked to speak to the district manager and I was told to take it up with the dealership.

Thank you Mary Barra for reducing the warranty coverage on these trucks. That L5P cost me a lot more than the old LB7 I used to have and the warranty on my '01 was better than what I've got now.
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"Chessy56"
So. Milwaukee, WI
'01 2500HD, LB7, 440K miles
"Stock" engine. Dual fuel filtration system with Kennedy lift pump, BF Goodrich Commercial T/A Traction tires (sold to a dude from Texas- it's living a warmer life just fine down there now!).

'17 2500HD, L5P (Happy Birthday/Merry Christmas to me!!! Not excited about loan and insurance costs though...). Bone stock, 81K miles.

"Socialism is a philosophy of failure, the creed of ignorance and
the gospel of envy. Its inherent virtue is the equal sharing of misery."
Winston Churchill
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  #10  
Old 03-15-2019, 07:46 PM
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DmaxMaverick DmaxMaverick is offline
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Any calibration installed to address a valid drivetrain or emission system complaint is absolutely covered by the warranty(ies). At the very least, the emission system warranty. If a calibration was installed to correct an otherwise warranty covered complaint, then the calibration was covered. Did the calibration installation correct anything you complained about? Did you ask for it, not related to a valid complaint? If not, they're still on the hook for it.
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1985 Blazer 6.2
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2014 Chevy Cruze Diesel - Fabulous car, no problems at all, but sold Nov. 2016 @ 55K miles.
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