2017 6.2 stutter, shake and stall

[6.2Midnight]

I was driving down the road, the truck started to stutter , shake , and then stall out. Sometimes it will run on its own (not very well) for a few seconds, sometimes it is very hard to start. With the codes I have and knowledge of the engine, I started to diagnose the issue.

So far I have replaced the following;

High pressure fuel pump and fuel line that goes to the fuel rail

Intake manifold gaskets to the heads

MAP sensor

I pulled the valve covers to check that the rockers were still moving as should, they do, so with that I believe the lifters are still good

I checked the in line fuel pressure from the tank, it is bouncing between 57-68, that is normal.

 

I have the following codes

P0106  MAP Stored

P0068 Throttle Body Air Flow Performance Permanent

P0097 IAT Sensor 2 Circuit Low Voltage Permanent

Mis-Fire on cylinder 8

 

I pulled all four O2 sensors to see if the CAT's were plugged, no better. I wasn't able to get my scope in there to see if the CAT's are plugged, I'll probably pull the "Y" pipe to see directly into the CAT's.

 

The wiring for the MAP, MAF test out correctly for function on my meter. I even pulled the MAF with the harness connected and pulled a vacuum, it worked correctly. I am thinking of swapping the TB's between my '23 and my '17 to see if anything changes.

 

I may have forgot some other things I have either checked or done.

 

Tonight, I pulled the power from the battery to see if that helps at all. I'll install them tomorrow morning and see what comes.

I am at a loss so far, and would appreciate any good help.

 

[rav3]

Have by chance check/cleaned your grounds?

 

Is your '23 6.2 under that GM recall?

Edited May 25, 2025 by rav3

[6.2Midnight]

9 hours ago, rav3 said:

Have by chance check/cleaned your grounds?

 

Is your '23 6.2 under that GM recall?

I'm trying to find a schematic that shows wherethe common ground is. And, unfortunately yes, my '23 is under that recall for the motor.

[rav3]

43 minutes ago, 6.2Midnight said:

I'm trying to find a schematic that shows wherethe common ground is. And, unfortunately yes, my '23 is under that recall for the motor.

Check these video out. I also have a 2017 Silverado LTZ & I did the "upgrades" shown in this video.

 

 

 

Edited May 25, 2025 by rav3

[6.2Midnight]

Anyone else?