Jump to content

2020 GMC Sierra 2500HD Error Code P20EE

slimjim7772
 Share

Recommended Posts

slimjim7772 New Member

slimjim7772

Posted
Posted

Purchased a brand new 2020 Sierra 2500HD 6.6L Diesel. The truck had ~400 miles on it when I left the dealership. I drove it for ~200 miles and the check engine light came on. Called Onstar for a diagnosis and they told me it was a P20EE error code. Took it to the dealer and was told this was a known issue and there was no solution although they had a Service Bulletin that said to reset the sensors, set it up for a regen and clear the code. The dealer said the code may or may not come back on. The next day the check engine light came on and I called Onstar again. They told me the same code P20EE. Called the dealer and was told to continue driving it, they said it would not hurt anything else and as long as the truck was running okay then everything was okay. In my opinion if the check engine light is on then the truck is not running okay. Contacted the GM Service Center and was told the same thing, that GM is working on a solution and to keep driving it until GM can resolve.

 

Now a couple of question: Has anyone else had this happen? Will it cause any damage or other issues in the future if I continue to drive the truck? 

slimjim7772 New Member

slimjim7772

Posted
  • Author
Posted

Okay...I guess I can’t find the “many many” posts. So I guess the answer to my first question is “yes”, that’s simple. But what about the second question? Since you have seen/read many many posts maybe you could be helpful and answer it. 

sdelam Enthusiast

sdelam

Posted
Posted (edited)

I've seen several posts for it. Some here, more on the duramax forum, and on a Banks idash facebook group. All have got the same result from dealers, reset, ignore and drive. Down side is that with a check engine light on, your remote start will be disabled. I have been fortunate, 5 k miles without an issue. (Knocks on wood).

 

Someone posted a copy of the service bulletin for reference. 

 

20190924_074203.jpg

Edited by sdelam
Shawn T Enthusiast

Shawn T

Posted
Posted

Mine is going back in again next week.  All the dealer does is clear the code and give it back, what a hassle.  Mine SES light was on for 3 days and went off yesterday.  What sucks is that while we are waiting for GM to fix this we have not remove start via the key fob or the MyGMC app. 

 

https://www.gm-trucks.com/forums/topic/226839-check-engine-light/page/2/#comments

 

BB&Chiveon Enthusiast

BB&Chiveon

Posted
Posted
8 hours ago, slimjim7772 said:

Okay...I guess I can’t find the “many many” posts. So I guess the answer to my first question is “yes”, that’s simple. But what about the second question? Since you have seen/read many many posts maybe you could be helpful and answer it. 

 

powerhaulic Enthusiast

powerhaulic

Posted
Posted

  

 

i have had P0700, general trans code. It is a loss of communication between modules, truck operated fine.

I also have a Banks Idash, nice to have as i can usually clear and check codes with it.

Shawn T Enthusiast

Shawn T

Posted
Posted

Picked it up last night, the current solution is a software update.  They reset the NOx sensor and uploaded the software, not fully confident it will work but I imagine the software update may take a few revisions.

DVohs3 Enthusiast

DVohs3

Posted
Posted

I had this same problem with mine too. About 750 miles and it came on. It used a half tank of def in that time period too. Has anyone else had the extreme def usage too?

DVohs3 Enthusiast

DVohs3

Posted
Posted

I had this same problem with mine too. About 750 miles and it came on. It used a half tank of def in that time period too. Has anyone else had the extreme def usage too?
UPDATE:  Took my truck to the dealership and they said that there was a recall (tsb) for the def system. They reset the check engine light and flashed the ecm with an updated software. I’ll do another update if it comes back or if it stays off for a month or so. 

xsvn2o New Member

xsvn2o

Posted
Posted

Mine has 6000 miles on it . Its been using a ton of DEF (30 plus gal so far) . after a few dealer visits I am about ready to try a ford . 

davester Senior Enthusiast

davester

Posted
Posted
On 9/30/2019 at 5:37 AM, powerhaulic said:

  

 

i have had P0700, general trans code. It is a loss of communication between modules, truck operated fine.

I also have a Banks Idash, nice to have as i can usually clear and check codes with it.

P0700 is just a generic error code meaning "the tcm has signaled the ecm that it's noticed a problem".

 

You need a more advanced code reader to get codes from the TCM, indicating the actual problem...

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

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,965
    Total Members
    8,960
    Most Online
    DaleB
    Newest Member
    DaleB
    Joined

  • Who's Online   4 Members, 1 Anonymous, 1,503 Guests (See full list)

  • Latest Articles

  • Posts

    • Atlas
      No Software Updates - Old Build

      By Atlas · Posted

      If there are updates/fixes you want, you could pay to have the updates applied by the dealer.
    • DaleB
      No Software Updates - Old Build

      By DaleB · Posted

      Hi all - my current truck is a 2022.5 1500 High Country 3.0. I bought the truck used last year. After doing some digging, I noticed that my truck's software is stuck on the original build from 2022. I have no available software updates. I talked to my dealer about this and they recommended not trying to force an update since the 36,000 mile warranty is expired. This is a big bummer since there have been many major releases since that have fixed small issues and improved speed/usability.   For reference, the current software build number is: full_gminfo37_gb-user 10 W158E-W164.4.2-QIH22B-563.3 158 release-keys Has anyone had a similar experience? Should I just forget about it and move on, or try a different dealer?
    • B07
      Needing this part.

      By B07 · Posted

      Sure. Buy it for me 🤣
    • B07
      Needing this part.

      By B07 · Posted

      Using zip ties but 2-3 they snap due to sharp edges. Just using a shoestring. Last longer. 🤣
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      I ordered the Snap On...waiting for it to come in later this week or early next week.   New front cover, new crank seal and new balancer are on. Water pump, pulley, fan, hoses, and plastics reinstalled. I can move forward knowing all my timing marks are dead on and the front engine is hopefully sealed better than it was. Take 2 with the water pump...trying high temp thread sealer on the lower bolts.   Rebuilt injector and new-new regulator is in, it looks like new. Top intake reassembled and all the bits are reconnected and snugged down.   Thinking about knock sensors again, I located both of mine and, there's your problem, Francis... The driver's side one is broke, plastic is bashed in, part of the wire is bare, and it appears to have been damaged like that for a long time. I saw the wire but didn't think anything of it. The knock sensor might not be my pulled timing issue, but it sure looks suspect. It must still be conducting, otherwise I'd expect a CEL. But perhaps with its sacred crystal inside exposed, jilted and dirty, maybe it's sending mixed signals. So I'm waiting for one of those and a new pigtail to come in. Pass side sensor looks good, except for the spark plug wire resting on it (!). The plug wires are healthy so it shouldn't be causing an issue, but I separated them and added zip ties to nearby looms to keep everything well apart.   So, I'm down to installing a knock sensor AND, oh, replacing the exhaust and cat. I actually think that's going to be fairly easy, it's all bolt-together, all new stuff from Walker is laid out on the shop floor ready to go. Hopefully have this thing on the road again for the weekend.   My luck? It will still be leaking oil, coolant, pulled timing, intermittent CEL for running rich, or it probably won't run at all -- because that's how this project has gone.   I've never worked on a vehicle so ...hurt? ...cursed? in my life. Everything has been effed with SO HARD, but I think...knock on wood...I've managed to undo all the backyard stuff and we're almost reset back to "just" an 80k mile, 30 year old Blazer.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...