2014 lml p0420 code - Page 4 - 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 #31 of 33 (permalink) Old 12-29-2019, 09:13 AM Thread Starter
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Quote:
Originally Posted by poosniffer View Post
OP, I'm sorry to hear about the troubles that you are having. I was thinking about getting a 2015 LML Duramax but I'm not willing to take the chance on the emissions system. Going to look at a LMM instead. I'm curious to hear what the ultimate resolution was for your issue. Good luck.
No more pending codes. I still have the perm code p0420. I need another trip or two to hopefully clear it.

2014 silverado crew cab 2500 w/t
Manual transfercase
Rollup windows
Stock configuration
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post #32 of 33 (permalink) Old 01-21-2020, 10:36 AM Thread Starter
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Well the p0420 code came up as a current code today.

So today I am doing a forced regeneration myself. The grams of soot started at 44g. I now have it down to 14g. Anyone know how low I can get it?

2014 silverado crew cab 2500 w/t
Manual transfercase
Rollup windows
Stock configuration
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post #33 of 33 (permalink) Old 02-16-2020, 03:48 PM Thread Starter
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Still dealing with the p0420 code. Nox2 ppm levels are half of nox1. Nox 1 and nox 2 percent levels are near the same most of the time. So what does this tell me?

Is there a calibration of nox sensor with a tech 2? If so how do I do it? I did see a reset but I have no clue of the procedure.

The dpf is down to 9g. The dp is .0007 when cold and .3 when warmed up. I think the dpf is clean and the 9th injector is working properly. The last 3 egts get to 1000+ during a regen.

Nox2 sensor takes a long time to respond from a cold start. I definitely have to drive the truck to get it to start showing values. Nox1 responds after a few minutes of idling.

2014 silverado crew cab 2500 w/t
Manual transfercase
Rollup windows
Stock configuration
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