Jump to content

!#@%* Emissions System

426ted
 Share

Recommended Posts

426ted Enthusiast

426ted

Posted
Posted

Hey everyone, back in May the check engine light came on and I got the warning in the DIC (pictures attached are from today but it read the same). Took it to the dealer. Tech could not find anything wrong though he did pull 2 codes. All summer it was fine until last week. The check engine light and notice came on for a bit but went out before I could get to the dealer. I have a big road trip planned tomorrow and guess what, it's back. I have noted that this truck pushes blue smoke occasionally when accelerating. Dealer was told last year and they indicated no oil loss between changes. Anyways, I am curious if other members have experienced this. Truck is a 2024 3500 Duramax. Cheers.

20251001_164938.jpg

20251001_164939.jpg

Dunn Senior Enthusiast

Dunn

Posted
Posted

did you miss a cpl of regens?

do you have a guage to tell you when?

 

mine had this first week I had it, since then I bought an I dash and have completed regens when they came up and no issues since......

EXSlider400 Senior Enthusiast

EXSlider400

Posted
Posted (edited)
4 hours ago, Dunn said:

did you miss a cpl of regens?

do you have a guage to tell you when?

 

mine had this first week I had it, since then I bought an I dash and have completed regens when they came up and no issues since......


This would also be my suggestion. I had the previous generation L5P and if I was making a lot of short trips, taking a good long road trip always seemed to help the regen do its thing. Also make sure you’re using good DEF….(not old stock as it degrades quickly) If you’re getting it out of a box/container, check the date (there’s a way to decipher the printed code on the box …just google it.). If you’re just pumping it in, make sure it’s a good high-use busy station.

Edited by EXSlider400
426ted Enthusiast

426ted

Posted
  • Author
Posted

I take it on quite a few long trips, plus highway speeds in the lower mainland, so I didn't think it was a regen problem. I got it back today. Error code P122D. They replaced the throttle plate as there were numerous chips on the backside along the sealing edge. Like, WTF, chipped throttle blade? Anyways, glad to have the truck back, but I don't trust it yet.

PBNB Enthusiast

PBNB

Posted
Posted

It might be a good time to grab a Banks monitor. I saw them on sale recently.

 

I have one and it tells me what is going on with regens and other info. I have it set to track trans and oil temps mostly and regens. Could the message on your dash just be telling you that the DEF is low? 

  • 2 weeks later...
426ted Enthusiast

426ted

Posted
  • Author
Posted

I think I should update this thread. Got it back from the dealer a few weeks ago. Here is the breakdown from the worksheet I got from the dealership:

 

P122D Current code. Followed P122D-00 diagnostic steps, clear code, repeat.

Inspect throttle plate assembly for damage/obstruction/coking. Found carbon build-up by nothing restricting the throttle plate.

Remove for more thorough inspection. Backside of throttle plate is chipped in multiple spots along the sealing edge.

Clean area and install replacement throttle plate.

 

WTF is carbon building up on the throttle plate? Do these trucks need a catch can? Mileage is 53000km.

 

 

 

customboss Senior Enthusiast

customboss

Posted
Posted
6 minutes ago, 426ted said:

I think I should update this thread. Got it back from the dealer a few weeks ago. Here is the breakdown from the worksheet I got from the dealership:

 

P122D Current code. Followed P122D-00 diagnostic steps, clear code, repeat.

Inspect throttle plate assembly for damage/obstruction/coking. Found carbon build-up by nothing restricting the throttle plate.

Remove for more thorough inspection. Backside of throttle plate is chipped in multiple spots along the sealing edge.

Clean area and install replacement throttle plate.

 

WTF is carbon building up on the throttle plate? Do these trucks need a catch can? Mileage is 53000km.

 

 

 

Use better fuel. Can you access Canadian CO-OP diesel? 

426ted Enthusiast

426ted

Posted
  • Author
Posted

I'd say I fill up at Chevron 95% of the time. We do have a Co-op locally. Better Diesel you think? I've started adding Hot Shot diesel treatment since I got the truck back.

customboss Senior Enthusiast

customboss

Posted
Posted
11 hours ago, 426ted said:

I'd say I fill up at Chevron 95% of the time. We do have a Co-op locally. Better Diesel you think? I've started adding Hot Shot diesel treatment since I got the truck back.

The CO-OP fuel is better in refining and additives that are hot blended. Use it. Change fuel filters more often if needed. 
What region of Canuck land are you located? 

426ted Enthusiast

426ted

Posted
  • Author
Posted

Located in Ladner. Paying $1.74/liter last fill. Bloody crooks. Where abouts are you?

  • Thanks 1
  • 2 weeks later...
customboss Senior Enthusiast

customboss

Posted
Posted
On 10/22/2025 at 8:09 AM, 426ted said:

Located in Ladner. Paying $1.74/liter last fill. Bloody crooks. Where abouts are you?

Southern Colorado USA, 40 miles east of Alamosa up mountain. 

customboss Senior Enthusiast

customboss

Posted
Posted
On 10/22/2025 at 8:09 AM, 426ted said:

Located in Ladner. Paying $1.74/liter last fill. Bloody crooks. Where abouts are you?

Vancouver BC. 

customboss Senior Enthusiast

customboss

Posted
Posted
On 10/22/2025 at 8:09 AM, 426ted said:

Located in Ladner. Paying $1.74/liter last fill. Bloody crooks. Where abouts are you?

Each Province in canuckland is different on accessibility of high quality locally refined fuels so do some footwork. 

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

    • JohnRoy
      2020 Sierra 2500 windows rolling down

      By JohnRoy · Posted

      Hey thanks yall for the info. It apparently was the key fob - the "reserve" key fob works just fine. Yall were all over it. Great input! JRD
    • PunchT37
      Wow I'm in a pickle. (Broke down truck) and a story.

      By PunchT37 · Posted

      I just bought one of these.   https://www.topdon.us/collections/diagnostic-tools/products/artidiag-pro   Yeah, it`s got a cable. $250/year after 2 years. Do I want more? Yep. But, I`m not working any more and can`t afford a whirlpool in my tool box.
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      Why don't I have a good scanner? I've always wanted one when I've needed one.   My latest reading says I don't need to do a relearn on the ckp sensor on a 1995 with OBD 1.5. The relearn is prescribed for the later-model 1995's which shipped with actual OBD II when GM completed the transition in prep for the 1996 MY. I need to confirm that. Did you know forums are disappearing? Knuckleheads on Facebook... it's not the same. It's just not.   So, scanners. Again, shooting myself in the foot for having eBayed my Snap On MT2500 "brick" with all the adapters. Not that I couldn't buy another but those are getting quite old, and mine wasn't new enough to work on 2000's vehicles.   Damn it (as I'm scanning my email between paragraphs here). Did you know there's a 2000 Jimmy 2-door on BaT that's ending this morning? It's local. I want it. 14k miles. Absolutely beautiful.   Back to scanners. MT2500's are old. Solus, now that could be a contender. There's a ~2008 Verus with a system error that's basically new in box for cheap. Hmm...I'm not sure about a scanner that runs an archaic version of windows (95 or CE, I can't tell).   I want the ability to reset and rotate TPMS, test individual modules, bleed ABS, electronic parking brake controls for servicing brakes, relearn procedures and other bidirectional controls.   Snap On does an MT2600. It's a new model as of last year, marketed as their "entry" scanner. Entry? Only where $1900 gets you through the doorway plus, I'm guessing, $1000/year if you wish to keep it current. So goes scan tools actually designed for production environments. Want decent products with excellent support, you pay for it.   Everyone is raving about Autels and TopDons and Foxconns and all these newer brands that are selling the $500 "prosumer" scanners for backyard hacks like me. They're tempting...honestly. Updates are cheaper, base prices are remarkably cheaper... And you get to deal with bugs and translation whoopsies and, well, just don't use it on anything expensive, OK? Having a dealer replace an ECU because it needs to be re-imaged after an adventure in scanning is no joke. But I think most people are getting by OK with these units.   eBay on a scratch-and-sniff pro-model oldie, a shiny new TopDon, or???   God dang it, I can't stop looking at this Jimmy. I'm ready! I'll Bring The TRailer! It's beautiful.
    • Texasdeere
      What have you done to your K2 today?

      By Texasdeere · Posted

      I removed the OE running boards.  It looked so much better.  I wish I took them off a long time ago.     I had to put something back on for my wife.  I wanted Westin Sure Grip Running Boards but they are very pricey, like $600 plus.  I was going to go with the Ionic 41's like I had on the 2019 Silverado but went with Westin Outlaw Drop Steps instead, about $200 cheaper.  They are sturdy and functional but not super crazy about the look, but it works.  
    • Atlas
      Gas Prices

      By Atlas · Posted

      It's all a crock of 💩

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...