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23' 3.0 Duramax emissions issues

Joe Prestella
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Joe Prestella New Member

Joe Prestella

Posted
Posted

Hi Team, 

 

I just bought a 23'  3.0 Duramax Silverado LT Z71 this past October.  I have had frequent issues and had the truck in the shop going on 3x inside of 1500 miles for  "Service Emissions System". I ran the trouble code and it came back with P2B97: Exhaust pressure control valve A position exceeded learning limit. This light and message goes on and turns itself off intermittently, but warns me that my max speed will be limited. On the second time time in the shop, they replaced the part FP: 400009243- SPAC C04108161, an part described as Actuator 3.67.

 

The trouble code/check engine light popped up in the following sequence.

11/2 On- within the first tank of gas from the dealer.

11/6 turned off, took to dealer and explained the code found. Dealer kept a few days, but told me I could pick up and drive because they didn't have the part.

11/11 light on again

11/16 took to dealer for repair, light on at time of drop off.

11/17 got the truck back

11/18, light goes on again, same message

11/20, light turns itself off

11/30, light goes on again... time to take back to the dealership...

 

My concern here is I am in CA and want to own this truck for a long time, but this is the type of issue that would fail a smog test when I have to renew registration down the line and I will then be stuck with the repairs.

 

I don't want a lemon, but this is getting ridiculous and I have some remorse over buying the truck at this point.

 

Any feedback is appreciated.

 

 

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Screenshot 2023-11-30 213814.png

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Phantom 4D Enthusiast

Phantom 4D

Posted
Posted

I haven't heard anyone else with the problem. I have the 2023 Sierra with the same engine. Close to 2,000 miles. No issues. You might consider contacting GM customer service and file a complaint. Send them the same photos along with the dealer name. Hold their feet to the fire. 

redwngr Senior Enthusiast

redwngr

Posted
Posted

Keep at them.

Eventually they'll get far enough down the diagnostic tree to get it corrected.

 

I follow several forums that follow 6.6 and 3.0 dmax trucks.

What you're describing is not something I recall reading about before. 

 

If you push the onstar button when it has the cel they can get the code

Joe Prestella New Member

Joe Prestella

Posted
  • Author
Posted

Thanks guys. I appreciate the comments and the feedback. Makes me feel like I am not on an island over here. The light turned off again this afternoon 🤦‍♂️- Go figure. I think it is somehow tied to the drive cycle. We will see. Taking it to the dealership again tomorrow....

SVG Enthusiast

SVG

Posted
Posted

OP, Just to give you some hope. I had an emissions issue within the first 7,500 miles (If I'm remembering correctly).

 

The dealer replaced a NOX sensor and a CAT.

 

Currently just under 50K miles and have had zero issues since.

Mshawn Enthusiast

Mshawn

Posted
Posted
On 12/1/2023 at 8:48 AM, Rick Davenport said:

There is an ECM update for the 2023 3.0. It covers a lot of codes. Take it in to the dealer and see if it applies. Here's the info on the TSB:

https://www.gm-trucks.com/critical-fix-released-for-silverado-sierra-3-0l-duramax-with-check-engine-lightfrom working in the diesel industry on heavy duty trucks, this was the first thing that comes to mind is a calibration problem( ecm or emission control module update. I opened prodemand and read this bulletin as this sounds like a solution to this problem.when you go back to the dealership take this bulletin number with or print it of ( the TSB listed in this article) ask for this update to be installed. Per GM training the bulletin should have been the first thing done. I think this might just solve your problem. 

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