GM how can they do this?

[76 Hondo]

General Motors,
Currently 2017 GMC Sierra radiator failure, transmission failure at 73,000 miles, now lifters making noise OK I’ve heard of this problem, dealer can’t look at it for 3 weeks.
Shop pulls off the heads and this is what we find! Explains why the lifter was noisy, but how does this happen?
Bent push rod, bent lifter, & broken rocker!!

 

[Bigbore500r]

General Motors,
Currently 2017 GMC Sierra radiator failure, transmission failure at 73,000 miles, now lifters making noise OK I’ve heard of this problem, dealer can’t look at it for 3 weeks.
Shop pulls off the heads and this is what we find! Explains why the lifter was noisy, but how does this happen?
Bent push rod, bent lifter, & broken rocker!! View attachment 1193270 View attachment 1193272

AFM lifter failed, resulting in bending the pushrod and ultimately breaking the rocker up top.
That lifter in the photo is one of the AFM lifters, you can tell by the spring at the top with the oil activated plunger

 

[Gelcoater]

Too much Ralley drifting?
Stay off the rev limiter, man.

 

[JDKRXW]

Now's a perfect opportunity to delete all the AFM stuff.

 

[liquid addiction]

I had a 2016 that had ticking noise since new. I took it back to the dealer and the service adviser told me its the oil pump making that noise and that his did the same thing. It didn't make sense to me, but I don't know much about them. It got totaled with 114,000 mils on it, and that noise had got bad. The "add oil" light would also come on after about 2500 miles after every oil change since new also.
Glad its gone.

 

[Baja 252]

I'm so glad my old 2010 6.2 doesn't have AFM.

 

[boatpi]

I don’t want to badmouth one brand , because I don’t do that. I own a lot of different vehicles and makes, it’s been many years since I purchased a GM vehicle, and this is another reason why I don’t. Air Cond controls to go out after a year alternators that fail and seize up the belt, paint that peels off, ac compressors that have. 100k built in life span, bad transmissions, now bad lifters when does it end.

I avoid.

 

[TPC]

A/C controls is most definitely still a GM weak point. I replaced all of it in our 2001 and all is good now.

 

[rivermobster]

They have been doing it forever, and people keep buying them!

That's how.

 

[LargeOrangeFont]

They have been doing it forever, and people keep buying them!

That's how.

When the other option is to buy a Ford… it’s easy to see why

 

[LargeOrangeFont]

Change oil on any AFM GM vehicle at 5k miles max.

And delete the entire system if you can.

 

[JDKRXW]

Change oil on any AFM GM vehicle at 5k miles max.

And delete the entire system if you can.

That's part of the problem .... the ENTIRE system has to be removed and replaced - including removing the pan to change the oil pump.
What a pain in the ass.

 

[RCDave]

General Mailase!

 

[WYRD]

I had an 01 z71 that was a royal pia for a couple of years. In 04 I replaced it with a ram 2500 and my issues went away

 

[LargeOrangeFont]

That's part of the problem .... the ENTIRE system has to be removed and replaced - including removing the pan to change the oil pump.
What a pain in the ass.

Yea it totally sucks to remove.

 

[jetboatperformance]

I look at at least one a week (Chevy and GMC) for either Trans or lifter pushrod issues for my warranty companies , one this AM (Happy F150 owner here)

 

[fastenuff3]

That's part of the problem .... the ENTIRE system has to be removed and replaced - including removing the pan to change the oil pump.
What a pain in the ass.

you have a tuner shut it off.my 2008 Suburban 302000 .mobil one every 5000.uses no oil

 

[D19]

I have disabled AFM via SuperChip Tuner on 6.2. Royal Purple oil. Burns no oil.

Another great mod is the Transgo trans fluid bypass. Dropped the trans temp 60+ degrees on average and shifts a lot better.

Basically, get rid of all the stuff that's supposed to make it more fuel efficient, because in reality it doesn't anyways.

 

[DarkHorseRacing]

I have disabled AFM via SuperChip Tuner on 6.2. Royal Purple oil. Burns no oil.

Another great mod is the Transgo trans fluid bypass. Dropped the trans temp 60+ degrees on average and shifts a lot better.

Basically, get rid of all the stuff that's supposed to make it more fuel efficient, because in reality it doesn't anyways.

GM issued a TSB for the trans bypass in Dec 2021. It’s now a dealer fix as well.

I plan to get it done since I tow and it should really help that out.

 

[Gripside80]

GM issued a TSB for the trans bypass in Dec 2021. It’s now a dealer fix as well.

I plan to get it done since I tow and it should really help that out.

Do you have a link for this TSB for the trans bypass? I couldn’t find anything. Thanks in advance.

 

[DarkHorseRacing]

Do you have a link for this TSB for the trans bypass? I couldn’t find anything. Thanks in advance.

21-NA-199 Chevrolet Engine Control System TSB

21-NA-199 Chevrolet Engine Control System TSB

www.tsbsearch.com

 

[hman442]

I had an 01 z71 that was a royal pia for a couple of years. In 04 I replaced it with a ram 2500 and my issues went away

On the other hand, I've had a '03 GMC 1500HD 6.0 since '04 & haven't had to replace anything to speak of besides brakes & batteries, + one C/V axle, but it is lifted 4". It does only have 170k though. Seems like they all make good ones and bad ones, but I agree the AFM lifter deal, for only 7% alleged economy gain, and only under perfect circumstances is a joke, for all the added complexity.

 

[hman442]

That's part of the problem .... the ENTIRE system has to be removed and replaced - including removing the pan to change the oil pump.
What a pain in the ass.

On my '15 5.3, I didn't have to do anything with the oil pump. Still plenty of parts though. Cam & lifters, oil galley plugs, and seems like a zillion bolts. Seems like almost every bolt in that entire engine is allegedly not to be used more than once. Computer tune as well. Seems like I read that the earlier ones might have needed the pump replaced

 

[Gripside80]

21-NA-199 Chevrolet Engine Control System TSB

21-NA-199 Chevrolet Engine Control System TSB

www.tsbsearch.com

I’m assuming since this is a TSB and not a recall…. It’s out of customers pocket correct?

 

[DarkHorseRacing]

I’m assuming since this is a TSB and not a recall…. It’s out of customers pocket correct?

I'm assuming so, but my GMC Yukon Denali XL is way out of warranty. If you still have a warranty it sounds like it could be added as part of any trans warranty work (and you just make something up that falls under CCND - Customer Complaint Not Duplicated).

I was wondering if it could be done with the Trans service (fluid change) as I don't know where this TBV is located. I don't know if they have to pull the trans completely for this. If they do it might really be pricey, but then again, its probably cheap compared to a whole new trans.

 

[HydroSkreamin]

I bought this 2015 GMC Sierra Denali 6.2L w/8-speed automatic with 132k miles off the back lot of a local car dealer. It was out there for a few weeks so I called to see what the deal was with it and learned it had a noisy lifter.

This truck was to replace my 2007 GMC Yukon Denali that I drove from 142k miles to 320k miles and finally sold it to an engine builder friend of mine for engine and trans cores. He also supplied a cam, LS7 lifters, AFM delete kit, new chain and oil pump and I absolutely could not be happier. I also got the AFM delete module that plugs into the OBDII port from Summit. A bit pricey but works great.

Having changed jobs recently and needing to move from WI to LOTO necessitated a truck that could pull the 24’ enclosed trailer.

From Memorial Day 2022 to Labor Day 2022 I put 25,000 miles on this truck, and 2/3 to 3/4 of those miles were pulling the enclosed trailer doing laps, where it pulls 9-12 mpg depending on load, wind, and my right foot. If I keep it 73 mph or under I stay above 10 mpg and rarely turn over 3200 RPM. Occasionally it gets to 3700 loaded on steeper inclines, but is way better than the Ram 2500 I rented to tow my boat down before this was fixed. I looked at my buddy as we got 7 mpg and turned 5000+ going up hills and commented that I hoped they torqued the rod bolts because we were testing them.

It pulls 19 mpg daily driving between home and work, and as shown below, it’ll pull 22-23 mpg on trips. Stock torque is 465 lb-ft, and I’ll bet it’s at 500 now by the way this thing pulls. Never chassis dynod it or anything but on the street it’ll pull 4-5 truck lengths on a stocker 2 years newer.

The only real disappointing thing was the fact that you either have to pull the engine or drop the front crossmember to get the pan off to change oil pump/crank sprocket/cam timing chain.

I’m never concerned about towing anything reasonable with this thing, it’s the best truck I’ve ever owned.

 

[WYRD]

On the other hand, I've had a '03 GMC 1500HD 6.0 since '04 & haven't had to replace anything to speak of besides brakes & batteries, + one C/V axle, but it is lifted 4". It does only have 170k though. Seems like they all make good ones and bad ones, but I agree the AFM lifter deal, for only 7% alleged economy gain, and only under perfect circumstances is a joke, for all the added complexity.

Agreed, I was just making light of it. Chevy, dodge, and yes even ford makes a better truck than I can. So I suppose I'll put down the stones and just relax in my glass house

 

[Orange Juice]

General Motors,
Currently 2017 GMC Sierra radiator failure, transmission failure at 73,000 miles, now lifters making noise OK I’ve heard of this problem, dealer can’t look at it for 3 weeks.
Shop pulls off the heads and this is what we find! Explains why the lifter was noisy, but how does this happen?
Bent push rod, bent lifter, & broken rocker!! View attachment 1193270 View attachment 1193272

You got kids?

 

[CarolynandBob]

21-NA-199 Chevrolet Engine Control System TSB

21-NA-199 Chevrolet Engine Control System TSB

www.tsbsearch.com

Will never buy a gm product again. I had this problem with my Silverado. They told me it was normal after they replaced 90+ parts in the trans and it still had the problem. I probably have the paperwork somewhere with them saying it was normal. Glad I sold it and got almost what I paid for it.

 

[76 Hondo]

You got kids?

No, just me that drives it, my go to work truck, go to the River truck( no not towing), go on vacation truck!

 

[Water Romper]

Sooooo, I'm in the market for a newer 2020 (or close to that) 1500 GMC 4x4. After reading this thread- do I need to re think my purchase and go over to a Ford F 150? Ive been a Chevy / GMC owner all my life but maybe I need to look at the Fords.
Seems no matter who you talk to, all trucks (GM, Ford , Dodge) have problems. You would think spending 40k - 60k on a truck would get you some peace of mind.
There's lots of joking around in the RDP threads stating "Should of had a F 150".... maybe there is truth to this.

 

[monkeyswrench]

It isn't one manufacturer, otherwise I'd have no means of income. Guy called me up, 2016 Cummins powered Freightliner. Baby Cummins, 6.7. It's a detuned lazy version of the Dodge motor. Same motor, different tuning...240hp?
Truck has a miss, dead hole. Injectors ohm out good, scan tool kills cylinders...#3 just along for the ride. Pull valve cover for a compression test, and see the problem.

80k on a motor that is governed and can't float valves...found one keeper on top of the lifter. I think the valve is swedged in the guide like a rivet.

 

[rush1]

It isn't one manufacturer, otherwise I'd have no means of income. Guy called me up, 2016 Cummins powered Freightliner. Baby Cummins, 6.7. It's a detuned lazy version of the Dodge motor. Same motor, different tuning...240hp?
Truck has a miss, dead hole. Injectors ohm out good, scan tool kills cylinders...#3 just along for the ride. Pull valve cover for a compression test, and see the problem. View attachment 1193504
80k on a motor that is governed and can't float valves...found one keeper on top of the lifter. I think the valve is swedged in the guide like a rivet.

Can you say CHINAH ! ( say it like Trump does) LOL , In all seriousness I really think that's the problem steel outsourced or recycled metal. On a stock application like this back in the day it was very rare, but not today.

 

[monkeyswrench]

Can you say CHINAH ! ( say it like Trump does) LOL , In all seriousness I really think that's the problem steel outsourced or recycled metal. On a stock application like this back in the day it was very rare, but not today.

I know the head casting said Brazil I think, and know I've seen India on castings....never see it on 80yo flatheads though.

 

[rivermobster]

Sooooo, I'm in the market for a newer 2020 (or close to that) 1500 GMC 4x4. After reading this thread- do I need to re think my purchase and go over to a Ford F 150? Ive been a Chevy / GMC owner all my life but maybe I need to look at the Fords.
Seems no matter who you talk to, all trucks (GM, Ford , Dodge) have problems. You would think spending 40k - 60k on a truck would get you some peace of mind.
There's lots of joking around in the RDP threads stating "Should of had a F 150".... maybe there is truth to this.

Truth is...

All machines break down.

GM builds their products as cheaply as they possibly can. They always have and always will.

Fords are more expensive for a reason.

Dodge power train might last a long time, but the truck itself will self destruct.

Choose wisely.

 

[ham&cheese]

Sooooo, I'm in the market for a newer 2020 (or close to that) 1500 GMC 4x4. After reading this thread- do I need to re think my purchase and go over to a Ford F 150? Ive been a Chevy / GMC owner all my life but maybe I need to look at the Fords.
Seems no matter who you talk to, all trucks (GM, Ford , Dodge) have problems. You would think spending 40k - 60k on a truck would get you some peace of mind.
There's lots of joking around in the RDP threads stating "Should have had a F 150".... maybe there is truth to this.

Take a look at the F150’s and go with the 5.0

 

[bk2drvr]

I had a 2012 Escalade with the 6.2 with AFM and it went 199k miles without an AFM related issue. The 6L80 trans in it did however fail at 130k miles.

I currently have a 2018 GMC Sierra 1500 w/ 127k miles and I changed the oil last night in it after reading this thread.

 

[boatpi]

My 2020 RAM 1500 diesel just hot 41,000 miles. No issues but the fuel pump is waiting upgrade per recall.

 

[D19]

GM issued a TSB for the trans bypass in Dec 2021. It’s now a dealer fix as well.

I plan to get it done since I tow and it should really help that out.

The Transgo kit is like $60 and it took me about an hour to install. I figured better than dropping my truck off at the dealer for a day or so.

Here’s the part # if anyone is interested.

 

[D19]

I want to know what pencil neck engineer said…

“Let’s put the air intake bolt (something that needs accessed often) right under a hard line.”

 

[coolchange]

Can you say CHINAH ! ( say it like Trump does) LOL , In all seriousness I really think that's the problem steel outsourced or recycled metal. On a stock application like this back in the day it was very rare, but not today.

Friend of mine builds race car parts. Cost of steel is a real issue. Supplier says here try this. Chinese steel. Specs out exactly the same. Decided to try it. Blended it in with the normal parts. Went through all machining process. Machinist called him and said the pins were done. But there’s a problem, weirdest thing, one batch of pins won’t harden. Enough said.

 

[pronstar]

The Transgo kit is like $60 and it took me about an hour to install. I figured better than dropping my truck off at the dealer for a day or so.

Here’s the part # if anyone is interested.

View attachment 1193821

How tough was the install, let’s say on a scale from 1-10 with 10 being “only engineers need apply”?

 

[Riverbottom]

Humans ain’t perfect. Anything made by man is gonna have

How tough was the install, let’s say on a scale from 1-10 with 10 being “only engineers need apply”?

I used the one from Shift Technology Products. It is all on an external manifold that is on the side of the transmission. Remove the cooler lines, take the little manifold and remove the thermostat and install piston with spring, check ball for bypass. It is probably a 30 minute job. I spent longer, as I studied the part and instructions since it was my first one.

 

[DarkHorseRacing]

The Transgo kit is like $60 and it took me about an hour to install. I figured better than dropping my truck off at the dealer for a day or so.

Here’s the part # if anyone is interested.

View attachment 1193821

I’m stuck with the dealer. I neither own the tools nor possess the know-how when it comes to the jigsaw puzzle the way they put cars together and I can’t be messing up my only ride to work.

Boats are fine with me because they are easier and simpler to work on and it’s not my source of income.

 

[monkeyswrench]

Friend of mine builds race car parts. Cost of steel is a real issue. Supplier says here try this. Chinese steel. Specs out exactly the same. Decided to try it. Blended it in with the normal parts. Went through all machining process. Machinist called him and said the pins were done. But there’s a problem, weirdest thing, one batch of pins won’t harden. Enough said.

Years ago, I was installing a replacement door on a 68 gmc. First run from Taiwan, big repro supplier. Looked right, even mic'ed out the right thickness...was about 20lbs lighter. Needed a ton of shims too. I guess the density of the "steel" was different.

 

[Mcob25rg]

The 10 year olds running the melting mill don’t care - they’re just trying to stay alive. Where do you think most of the scrap in the US goes - buy American made, much better chance of success

 

[D19]

How tough was the install, let’s say on a scale from 1-10 with 10 being “only engineers need apply”?

2-3 for someone who is mechanically inclined.

There are videos on YT on how people modify the t-stats to give you a better idea of the process but I highly recommend using the Transgo kit and not plugging the t-stat like some do.

See attached