Lifter issue: TSB PIP5776E - published June 18

Firehawk99 · September 1, 2021

5 minutes ago, bigbulls said:

Sorry it took so long my contact was on vacation. Your engine was built in Spring Hill Tennessee.

Thanks Firehawk99 I just crawled under and took a picture of my Julian tag and it starts with N and I was going to ask the same question. May 12th 2021 for me and Vin build date is 6/21 so it looks like it's running about 3 weeks to a month difference from engine build to truck build. Thanks again for all your info.

Anytime! Happy to help out.

jayoco · September 1, 2021

5 hours ago, Firehawk99 said:

Sorry it took so long my contact was on vacation. Your engine was built in Spring Hill Tennessee.

Thank you, Firehawk99!

Philbert · September 5, 2021

Back in the shop, after all lifters and a bent pushrod were replaced I picked it up and started shaking badly at about 40 mph and on light acceleration or when coasting. Was able to get it home, called my local dealer who said no appointments until 9/20 or drop it off and they will get to it when they do. Continued driving it as it wasn't horrible and no check engine light until I started smelling burning oil. Look under the hood and see oil pooling on the the intake manifold dripping down onto the exhaust manifold. Didn't have a choice but to drop it off at the point. Now waiting 5 days as it's a holiday weekend to be looked at without a loaner. Take as long as you want to repair it, once it reaches a total of 30 days I will get and attorney and proceed with lemon law. GM is useless and their " senior rep" never picks up her phone. Horrible customer service.

20SierraL8T24 · September 9, 2021

On 8/5/2021 at 3:31 PM, Firehawk99 said:

Any trucks built after 3-4-21 should be fine. That is the break point.

My question is, what changed? Hardware or software?

Firehawk99 · September 9, 2021

2 hours ago, 20Denali21 said:

My question is, what changed? Hardware or software?

Hardware. Bad batch of supplier parts.

Scott W .Kennedy · September 9, 2021

I bought my trail boss in March , just over 7000 miles , was told they are going to replace all lifters. They won't send me a copy of the bulletin. Anyone know the exact cause for the lifter failure , they said the springs but I read somewhere it was from bent push rod.

Swerve-n-protect · September 15, 2021

I have a 2021 Denali w/6.2 that has a truck built date of 02/21.... have 13k miles on it... I haven't noticed any issues yet, should I get the Pulsar sooner rather than later? thanks!!

SSGUNNER · September 23, 2021

On 8/5/2021 at 12:31 PM, Firehawk99 said:

Any trucks built after 3-4-21 should be fine. That is the break point.

On 8/5/2021 at 1:26 PM, Firehawk99 said:

I work for GM at the Tonawanda engine plant. We build the 4.3, 5.3, 6.2 and the 6.6.

can you confirm is this the lifter sound of a possible issue? This is on a 2021 Tahoe with the 5.3

https://youtu.be/4XMoY7Y1e1k

Firehawk99 · September 23, 2021

can you confirm is this the lifter sound of a possible issue? This is on a 2021 Tahoe with the 5.3

https://youtu.be/4XMoY7Y1e1k

It sure sounds like it to me. I would park it and have the dealer come pick it up.

SSGUNNER · September 23, 2021

2 hours ago, Firehawk99 said:

It sure sounds like it to me. I would park it and have the dealer come pick it up.

Cool, thanks luckily it’s on a vid I pulled from another forum. I asked here because at first to me it sounded like injectors similar to this video at 5:20+

Desrunner · November 14, 2021

@Firehawk99 Thanks for checking on these plant codes. I have K121193, so it looks like a July 12 build but where??

Edited November 14, 2021 by Desrunner

Firehawk99 · November 16, 2021

On 11/13/2021 at 9:59 PM, Desrunner said:

@Firehawk99 Thanks for checking on these plant codes. I have K121193, so it looks like a July 12 build but where??

Your engine was built in Canada at the St. Catharines powertrain plant.