Sounds like you have a good shop working the problem. Can you give any specifics as to how the truck was used, idle time, type of oil and change interval?Verdict is in.....
Cam shaft failure. Engine is being replaced under warranty. Will be a few weeks before I get the truck back.
Sounds like you have a good shop working the problem. Can you give any specifics as to how the truck was used, idle time, type of oil and change interval?
I realize not the same but the L5P does share similar camshaft and valve train design from the LS engine family. Our work trucks with the 6L have had lifter issues from all the idle time we put on them. I do believe that more frequent oil changes would have prevented or prolonged some of these failed lifter/camshafts.
Good luck, keep us in the loop.
I have a 2018 Sierra 2500HD L5P with around 53k miles on it.
I am at my wits end with the incompetent dealership I have been working with and still don't have resolution with this. They have replaced harmonic balancer, water pump, both smooth idler pulleys, serpentine belt, and I STILL have this noise that sounds like a bearing squeal.
Since they weren't honest on their service invoice notes, I have just removed the accessory belt and started the truck and the noise is still there, so that I have confirmed.
Here is the video of the noise.You will hear the higher pitched metal on meal squeal sound.
Have any of you replace that fan bearing pulley yet. That seems to be the only next culprit or its something else internal to the motor, which I don't think is the case since I would have seen other issues with engine performance. Thanks for your input and taking a look!