Jump to content

2020 3.0 Duramax - Code P2002

akawally
 Share

Recommended Posts

akawally Enthusiast

akawally

Posted
Posted

I bought my 2020 GMC AT4 back in early December.  I took delivery up in Montana so my first drive was a 750 mile trip home.  I have driven it very little since and it currently has about 1500 miles on it.  I noticed the CEL on the other day so I plugged my ODB scanner into to reveal a Code P2002 Diesel Particulate Filter Efficiency Below Threshold.  It was running fine, no other apparent symptoms.  Read more at: https://www.obd-codes.com/p2002

 

I took it into the dealer two days ago.  They called me later that afternoon and said that it was a new situation and that they were working with GM Engineers to determine a proper course of action but they would like to keep it overnight.  I wasn't surprised, in fact I expect that out of a new power plant and I have a daily driver.  Yesterday they let me know they were Fed-Exing an "exhaust pressure differential sensor" from Lansing.  They said the truck was OK to drive and that I could pick it up if I wanted.  I elected to wait until the repair was completed and hope to have it back today.  

 

I didn't see this code posted on the forum so I thought I would drop this information here for others to search.  I will provide another update when I get the truck back.  I will also ask what this would cost if it wasn't under warranty because I think that is useful information for evaluating the total cost of owning the LM2 diesel plant.  I did get an extended warranty but cost/risk and warranty coverage will be a inevitably be a huge factor in deciding how long to keep this particular rig.  I really really like driving it, more than the 6.2 and ALOT more than the 5.3.   I haven't towed with it yet but I hope to try that out this weekend.


WALLY

20200223_134401.jpg

Screenshot_20200223-170456.jpg

akawally Enthusiast

akawally

Posted
  • Author
Posted

Just got an update...  The sensor arrived but the technician won't have time to install it until tomorrow by EOD so I will have it for the weekend.  I asked them to check for recalls and they initially confirmed that it was all up to date, but today they said that two new updates were just released so they are going to get those done also.  I will find out more info on those when I pick it up.

 

On a side note, it seems like they have a HUGE number of T1's in for service right now, and the diesel specialists are especially highly constrained.  I think TSB's and recalls have the service department running hard.  Now I know where a good portion of my $61k is going.

 

WALLY

tlaw91 Enthusiast

tlaw91

Posted
Posted

I like your truck, nice color/option combo.

The new 3.0’s are fascinating, I can’t get over the mpgs and how quiet they are.


Sent from my iPhone using Tapatalk

akawally Enthusiast

akawally

Posted
  • Author
Posted
On 2/27/2020 at 4:38 PM, tlaw91 said:

I like your truck, nice color/option combo.

The new 3.0’s are fascinating, I can’t get over the mpgs and how quiet they are.


Sent from my iPhone using Tapatalk

Thanks!  I think its perfect :) 

 

UPDATE:  I picked up my truck yesterday, one of the DPF sensors was failing.   The cost to diagnose and replace would have been about $800 without the warranty.  I have had two of these fail on my 2016 Colorado (2.8 TD).   This indicates a potential for higher maintenance for a diesel over the long term unless some delete options emerge.  I got an extended (120k mile) warranty so I am not worried about it, but still just kinda interested in those costs overall.  I do love this truck.

 

They also applied the two latest updates that were released while it was in the shop - one was for the braking system and the other was for infotainment. 

Firetrout Enthusiast

Firetrout

Posted
Posted

Just had to drop mine off at dealership for Check Engine Light CODE P213A.  Waiting on a call back to let me know what issue is.  DIC showed 175 miles to reduced speed, service emission system.  Will keep yall updated.  

afterburner82 Enthusiast

afterburner82

Posted
Posted
On 2/29/2020 at 10:14 AM, akawally said:

Thanks!  I think its perfect :) 

 

UPDATE:  I picked up my truck yesterday, one of the DPF sensors was failing.   The cost to diagnose and replace would have been about $800 without the warranty.  I have had two of these fail on my 2016 Colorado (2.8 TD).   This indicates a potential for higher maintenance for a diesel over the long term unless some delete options emerge.  I got an extended (120k mile) warranty so I am not worried about it, but still just kinda interested in those costs overall.  I do love this truck.

 

They also applied the two latest updates that were released while it was in the shop - one was for the braking system and the other was for infotainment. 

Can you elaborate on the infotainment update at all?

akawally Enthusiast

akawally

Posted
  • Author
Posted
14 hours ago, afterburner82 said:

Can you elaborate on the infotainment update at all?

Yes!  Here is a photo of the service sheet which specifies updates.  I assumed that one was infotainment because when I picked up the truck it ejected the NAV SD card and then loaded an update before I drove it home.  Looking closer it seems like the two updates were for the brake system issue and a reductant control module update which is specific to the Diesel emissions stuff. 

 

WALLY

20200302_185159.jpg

Firetrout Enthusiast

Firetrout

Posted
Posted

They were able to clear the code and check engine light with the redundant control mod update..............hopefully that takes care of that problem.  

gone_fishing Enthusiast

gone_fishing

Posted
Posted
4 hours ago, Firetrout said:

They were able to clear the code and check engine light with the redundant control mod update..............hopefully that takes care of that problem.  

Thank you for the update. Hopefully this fixed your issues. Keep us posted with any other issues. I'm interested in this motor and will be in the market in the next year. BTW, what color is your Sierra and do you have any more pics? Don't think I have seen that color on the road.

 

Thanks!

  • 5 months later...
nickchodge New Member

nickchodge

Posted
Posted

I had this same problem with my 2020 AT4 3.0 diesel. Picked up in June. At 1900 miles the check engine light came on. Took it to dealer and they said the same thing: this is something new and they had to contact GM headquarters for info. I was told it was a diesel particulate sensor. They've had my truck 7 days. Am supposed to get it back today. I am in Spokane, WA. 

  • 4 weeks later...
SWBuckeye Enthusiast

SWBuckeye

Posted
Posted

Hi all.

 

I had the Brake Control Module and the ECM & Reducttant Control Module as well (3.765 miles). Then I have the exhaust back pressure valve go out and had to be replaced (code p2b97) (3,870 miles).  All has been good since, at 10,445 miles now. 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • newdude
      2027 3.0 l Duramax

      By newdude · Posted

      Thrust bearing is a very small window.  But nice try.   Turbo oil filter?  Haven't seen any failures.  Change your oil more frequently.  Use a better oil than the factory oil.  
    • newdude
      2026 sierra bad brake controller

      By newdude · Posted

      There is a p/n called out in the one PI that GM has.  Curt 57003 inline load adapter that is used for LED trailers that are having trouble with these newer trucks.  No cutting, no splicing, etc.  GM did update the lighting module around 2023 to better pick up trailers with LED lighting, but it still can happen.     Here's the link to the Curt site for it - 7-Way RV Blade LED Electrical Adapter (Not a Wiring Extension) SKU #57003 by CURT   The PI I am referencing - MC-10208985-9999.pdf   Its not just a GM deal either.  Newer Fords and Rams have this same problem.       In another PI, they recommend that the trailer has a Pollock brand 7 way on it as that is who makes the truck sides for the OEMs.  GM is also big on making sure the trailer is trouble free.  So no wiring issues, all lights are functional, better quality 7 way plug, etc.     The other PI I am referencing - MC-10178359-9999.pdf   The model year range is older but it is the current PI for 2014-2026.  It calls out the Pollock RV HD 7 way they recommend.  
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      That's part of the problem...the EGR has already been replaced, and I've already had the complete intake assembly removed, and the EGR passages were clear at that time. That leaves wiring, PCM, or another variable that I wasn't expecting. Best I can tell, it's not wiring or the PCM, so I'm grasping for straws.   The PCM uses the MAP reading to confirm the requisite loss of vacuum in the manifold when the EGR activates. Since that's vacuum related, it involves a lot of other systems which could play a role.   The overall diagnosis has to be considered too. The fuel lines in the intake had rubbed through and were dumping fuel into the intake, drowning the cylinders in fuel, and putting raw fuel into the sump and cat converter. The fuel system has been fixed but the complete path of damage may not be. If the cat was damaged and melted the internals, it could be partially obstructed and also playing into the EGR issue.   I'm retracing my steps; trying to go back to thinking thinking Horses not Zebras based on the clues I've been given. These engines aren't *that* complex.   Could it be, now that the truck is running well, that carbon and crud from being run with the fuel system in disarray is now dislodging and clogged my clean EGR passages where I can't see?  That's what the code is actually saying. The flow is restricted, dummy. Retrace step 1.   I may just need to remove the lower intake again. Before I do that I'm going to try removing the EGR and running the engine for a few seconds to see if it will blow anything lodged in the egr passages out through the open ports.     That's been helpful in the past. For the spider injector, there's no guarantee I'll get a working one. The spider I have seems fine now that the high pressure fuel line isn't making an early delivery via large hole. SO at least I'm not marooned and looking for one of those.   Row52 (dot com) is also a good one for watching for vehicles at local yards.  
    • Grumpy Bear
      Some Assembly is Required

      By Grumpy Bear · Posted

      Disassembly may be Required!   Every blender makes claims but do  you ponder those claims? What was really said? Was it true?  Motive for saying it? What does in infer?  Is that inference true?    Let's do one.    Claim: Made from shear stable base oils.    What was said: Base Oils are shear proof.   Was it true: Yes.  ALL base oils are Newtonian.    Motive / Inference: To imply the fully formulated product is Shear Proof.    Is the Inference true?: Most fully formulated multigrade oils contain Viscosity Modifiers or VM's, sometimes called VII or Viscosity Index Improvers. There are four types. One is in fact shear proof but it also has a bad effect on extreme cold flow and is restricted to use in specialty oils. A second has limited shear called a 0-5 SSI polymer. Meaning its shear is limited to a range of zero to five percent as reported by the ASTM D6278 Shear Stability Index test. A few high end oils, like Torco SR-5, use them and brag about it profusely. Actually all that use it point it out. The last two shear dramatically and are often marketed as a 'feature' of the product aiding the oil to meet fuel standard requirements of ever stricter rules. One shears more than 5% and the other up to 20%. As you make guess, cost is directly linked to shear down and as such the majority of oils use the cheapest organic polymers sold to make grade and pass stringent tests.    PPD's or Pour Point Depressants also shear a bit, only a few percent and hide inside the 0-5 SSI capabilities.    The blender knows he can not out engineer Stribeck. Physics is not a suggestion. But he can wordcraft the unsuspecting toward believing a false claims INFERENCE. This is LEGAL. It is COMMON, and it is EFFECTIVE.         
    • Jsdirt
      2006 Silverado HVAC sensor location in dashboard

      By Jsdirt · Posted

      I don't recall ever dealing with one on an '06 and back. It may not even exist on that. I can't remember for sure.   Any kind of ice in or after the evaporator is normally due to low charge with both a clutch-cycling orifice tube system, and a TXV system.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...