2014 lml p0420 code - Page 2 - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #11 of 33 (permalink) Old 11-21-2019, 05:26 PM
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Quote:
Originally Posted by Ron Nielson View Post
Has your truck gone thru the regen process on a regular basis?



This information is published for my 2008 LMM truck - yours may be different:
  1. Inspect for the following conditions, which may cause a diesel oxidation converter (DOC) to degrade:
[LIST]
  • Off Road Fuel or Red Dye Fuel
  • Low quality B-20 fuel
  • Fuel Containing high sulfur content
  • Engine oil or coolant consumption
  • Leaking fuel injectors
Non-ULSD fuel was a concern back in 2008, but it is not illegal to manufacture or sell it in US or Canada.
During the conversion of the N.A. fuel supply there was a period of time both were available, the as the conversion was 'phased', there was a period of time when non-taxed (and usually dyed to identify it) fuel was LSD while rod fuel was ULSD.

Today, all US/Can fuel is ULSD.
Non-taxed fuel is still typically dyed so the 'revenuers' can identify it if/when they are doing roadside checks.

(Diesel that is not ULSD can still a concern for those that might be travelling in some areas of Mexico)

2018 GMC 2500 L5P CCSB 4x4 Denali - Mineral Metallic; previous '11 LML, '10 LMM and 04.5 LLY
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post #12 of 33 (permalink) Old 11-21-2019, 07:20 PM Thread Starter
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No the truck is not registered in an inspection State. Diesels are still exempt. Nox sensor turned into box sensor by Google keyboard. Sorry about that.

2014 silverado crew cab 2500 w/t
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post #13 of 33 (permalink) Old 11-21-2019, 07:51 PM Thread Starter
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That is the plan for now. If they replace nox sensor 2 and do a forced regen, do you think 1200 miles will be possible on Wednesday? Assuming I get it back by Wednesday.

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post #14 of 33 (permalink) Old 11-22-2019, 06:47 AM Thread Starter
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Thanks. I will take your advice. My scan tool did show a percentage on the dpf at 48 to 52. That is after a normal regen. It was at 100 before the regen when the fault first came up. At my job we have protocols as well, but it is my experience that techs take the easy path. Experience also tells you what the most likely fix will be that vary from the protocol standard. Maybe my tech will have some experience on a Duramax.

2014 silverado crew cab 2500 w/t
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post #15 of 33 (permalink) Old 11-22-2019, 07:26 AM
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How many miles are on your truck? I've repaired numerous P0420 codes with a new 9th injector or indirect injector and a stationary regen after the replacement. I've replaced the indirect injector on 4 different LML trucks at around the 120,000 mile mark and it's repaired every one of them. Just did one on Tuesday. Not saying that's the issue on yours but it's possible. The injector gets clogged up and dribbles fuel into the exhaust stream instead of spraying and then it can't get hot enough to do a successful regen.

Turning wrenches 5 days a week.
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post #16 of 33 (permalink) Old 11-22-2019, 07:43 AM Thread Starter
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99985 miles when the codes first came up. It has been 3000 miles since I've added any def and it still says ok. Maybe I should top it off to see if it is using any.

Most of the trucks life has been on the highway. But this summer I was hauling logs out of the woods. It idled a bit to keep the ac on while I loaded the trailer. Maybe that is how this issue started. I am just now reading that idling is not a good idea.

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post #17 of 33 (permalink) Old 11-26-2019, 02:21 PM Thread Starter
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Well they indeed replaced nbr 2 nox sensor and indeed failed after just under 100 miles. Good thing I was able to dump the trailer and gear off before taking it back to the same service center in Oshkosh.

Same codes: u029d u029e p0420 p220b these are pending and permanent codes.

Have to fly home for work so we will see how it goes in a couple of weeks.

Thanks GM, thanks EPA!

2014 silverado crew cab 2500 w/t
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post #18 of 33 (permalink) Old 11-26-2019, 03:50 PM Thread Starter
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My son asked me if my def spray could be plugged up, making the regens useless. He ran into this at the bus shop.

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post #19 of 33 (permalink) Old 11-30-2019, 04:35 AM Thread Starter
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Two wires rubbing together near x107 may be the cause. This large connector came loose from its mount and caused damage to two wires , either b10 and c10 or b1 and c1. These are nox sensor power and ground wires for nox 1 and 2. No word from the dealer yet. I may just go there on Tuesday and pick it up ready or not. I did tell them about the two wires.

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post #20 of 33 (permalink) Old 11-30-2019, 09:47 AM
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Quote:
Originally Posted by Los1wing View Post
My son asked me if my def spray could be plugged up, making the regens useless. He ran into this at the bus shop.
Not being able to inject DEF as nothing to do with regen success or lack of.

Plugged def injector could cause high NOx level problems, but the 9th injector would still be able to inject diesel for the regen's to occur and burn soot from the DPF.


The so called '9th injector' injects fuel into the exhaust for regen.
The 'DEF injector' injects DEF for NOx reduction -- whenever it is running.

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