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GM 6.2L Engine Issues

Boozer

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Anyone having ongoing issues with their 6.2?

I have a 2016 Escalade, last summer it started idling rough and the problem progressed. After taking it to the dealer they informed me that 2 of the lifters came apart and they repaired the issue. They claimed to have replaced the lifters and done some type of rebuild to the engine.

I took a drive this evening and the problem appears to be happening again. This time it seems to be even worse. When I was leaving the grocery store the truck didn’t even want to start and it stalled on me twice trying to get home.

This is a $100K car. Seriously, WTF???


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DRYHEAT

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I can’t imagine a dealership trying to do an internal minor repair like that, I just don’t think there’s anyway to get it clean if in fact a couple of lifters came apart. That really sucks I hope they get the problem figured out and GM takes care of you. :(

How many miles are on this engine?
 

Boozer

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I can’t imagine a dealership trying to do an internal minor repair like that, I just don’t think there’s anyway to get it clean if in fact a couple of lifters came apart. That really sucks I hope they get the problem figured out and GM takes care of you. :(

How many miles are on this engine?

60K and only 6K since the last rebuild. I’m reading the Caddy forums and they’re saying this is a common issue with the 6.2 because of the active fuel management.


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DRYHEAT

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60K and only 6K since the last rebuild. I’m reading the Caddy forums and they’re saying this is a common issue with the 6.2 because of the active fuel management.


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That sucks, hope they get it resolved. Sounds to me like they should’ve given you a new engine.
 

Carlson-jet

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How can this be. Roller cams never fail.
Hope you get a new motor.
The one between your frame rails is toast.
True story. ;)
 

Carrera205

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I had a 2010 Silverado lost a lifter due to AFM and had to have the engine rebuilt as it lost a cylinder and fucked it all up. Thankfully it was covered by the power train warranty. Then I got a 2015 Silverado and was told the new eco whatever engines wouldn’t have this lifter fail issue. I didn’t have any issues with the 2015 but now I have a 2016 Denali with the 6.2 and it’s making me scared. Half tempted to get a tuner and shut the afm off. There shouldn’t be any issue with failure if it’s shut off or so I’ve read.
 

BingerFang

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AFM fucks everything up on Chevy motors according to the forums. I replaced a 5.3 with 110k on it and as soon as I had the new motor installed I bought an AFM disabler that plugs into the to OBD2 port full time.
 

monkeyswrench

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From what I have found the AFM is really picky about oil life and type of oil used. If the motor junked a lifter, the glitter factory goes everywhere. If they swapped a couple "bad lifters", they owe you a motor. There is no way to flush the oil galleries in the block without pulling it down to bare block and tanking it.
 

pronstar

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Half tempted to get a tuner and shut the afm off. There shouldn’t be any issue with failure if it’s shut off or so I’ve read.

If you don’t want to muck with your factory computer, and just want to disable the AFM, you can plug one of these into your OBDII port.

25A0E232-E4B7-4D25-B15F-CD6A1B218E44-7810-0000092CD97F1534.jpg


Remove it when you take your car to the dealer and no one will ever know.


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Taboma

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It was seriously disappointing to read an article on the new C8 Vette and discover it too has AFM. Apparently the C7's did as well, at least in the Auto version or in Eco-mode with a stick. Then of course the lovely manual tranny Skip-Shift and my Raptor Eco-Boost with the POS Stop/Start feature that's the first button I hit each new start. :mad:
 

Big B Hova

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Disabling the AFM wont fix it, you need to replace the AFM lifters with regular lifters.

On 07-13 trucks there is a oil screen under the oil pressure sensor that SHOULD be cleaned regularly. It is called a filter, but GM does not consider it part of any service.

Kinda bullshit if you ask me. My 07 6.0 lost oil pressure but It was the screen clogged, I caught it in time and it didn't fuck up any lifters. When that screen blocked, it blocks oil flow too.
 

redone76

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Funny this thread came up. Doing a AFM delete on a buddies '08 silverado tomorrow.
 

Havaduner

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Just received a letter from GM talking about what I assume is this issue on my 2017 Silverado. Says they know they have a possible injector issue on the 5.7 and 6.2. Letter says they are giving us 10 years, or 150,000 mile cover for this issue. Letter says if you've already paid for repairs, there is a form to fill out for re-imbursement. Maybe you should push harder on the dealer ( or another) to see if your engine serial# falls into this coverage?
 

Rsqfxr

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No issues, my 08 6.2 doesn’t have afm


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Boozer

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Just got off the phone with the dealer. They can’t get me in for a week and I have to it to have it towed to them on my dime even though it’s under warranty and this is now the second time this happened in just a little over 6K miles.

This will be the last GM product I own. Looks like I’ll be telling the local Chevy dealer to get bent and won’t be moving forward with a new C8 either. If this is how they treat someone who owns an SUV that cost $100K I can’t imagine how they’ll treat people spending a crap ton of money on a Vette.


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pronstar

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Just received a letter from GM talking about what I assume is this issue on my 2017 Silverado. Says they know they have a possible injector issue on the 5.7 and 6.2. Letter says they are giving us 10 years, or 150,000 mile cover for this issue. Letter says if you've already paid for repairs, there is a form to fill out for re-imbursement. Maybe you should push harder on the dealer ( or another) to see if your engine serial# falls into this coverage?

Can you scan the letter and post it?


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pronstar

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Disabling the AFM wont fix it, you need to replace the AFM lifters with regular lifters.

Two identical new trucks.
1. Stock
2. Electronically disabled AFM

Are both susceptible to AFM lifter collapse?
Does AFM actuation (or lack thereof) have anything at all to do with the issue?

I’ve got a ‘15 so shouldn’t have the clogged-screen issue...is that right?




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Big B Hova

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Two identical new trucks.
1. Stock
2. Electronically disabled AFM

Are both susceptible to AFM lifter collapse?
Does AFM actuation (or lack thereof) have anything at all to do with the issue?

I’ve got a ‘15 so shouldn’t have the clogged-screen issue...is that right?




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I dont know about the 14-up trucks.

The oil screen issue is the screen gets clogged and starves the lifters from oil is what I understood.
 

glamis0812

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I drove my wife’s 16 Escalade the other day and was like wow this thing has a rough idle. Looks like I need to call the dealer. Only has 45k
 

Big B Hova

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I drove my wife’s 16 Escalade the other day and was like wow this thing has a rough idle. Looks like I need to call the dealer. Only has 45k

MY wifes 16 tahoe was just at the dealer for the 3rd time in a month for a rough idle. Finally fixed. Replaced both motor mounts and performed a TSB on shimming the motor mounts. First 2 times dealer said there was no issue. Dealer stated since there was no check engine light everything was good. I called BULLSHIT
 

lbhsbz

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Just got off the phone with the dealer. They can’t get me in for a week and I have to it to have it towed to them on my dime even though it’s under warranty and this is now the second time this happened in just a little over 6K miles.

This will be the last GM product I own. Looks like I’ll be telling the local Chevy dealer to get bent and won’t be moving forward with a new C8 either. If this is how they treat someone who owns an SUV that cost $100K I can’t imagine how they’ll treat people spending a crap ton of money on a Vette.


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This is why I’ll never buy anything new from the big 3...lots of service dept horror stories.

I’ve worked as tech for both GM and Toyota...the manner in which the companies operate is completely different.

I bought a used 2003 4runner a couple years back with 200K miles on it. This model had an issue with the dashboard material degrading and becoming sticky. Toyota had a Campaign out on it and put a new dashboard in my 15 year old 200K mile truck under warranty. Even I couldn’t believe it. An idea like this would be completely foreign to the domestics.

Irrespective of vehicle quality, Toyota has proven themselves to stand behind their shit better than most...they’ll likely get my business if I can ever afford a new vehicle.
 

Ziggy

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Disabling the AFM wont fix it, you need to replace the AFM lifters with regular lifters.

On 07-13 trucks there is a oil screen under the oil pressure sensor that SHOULD be cleaned regularly. It is called a filter, but GM does not consider it part of any service.

Kinda bullshit if you ask me. My 07 6.0 lost oil pressure but It was the screen clogged, I caught it in time and it didn't fuck up any lifters. When that screen blocked, it blocks oil flow too.
I remember your thread about it and the tricky shortcut to reach the screen without doing the intake R&R.
My '08 Saab SUV has the 5.3 in it and so far all ok(knock on wood)
 

707dog

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I remember your thread about it and the tricky shortcut to reach the screen without doing the intake R&R.
My '08 Saab SUV has the 5.3 in it and so far all ok(knock on wood)
zig any chance you could point me in the direction of that screen cleaning post
 

Dalton

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I remember your thread about it and the tricky shortcut to reach the screen without doing the intake R&R.
My '08 Saab SUV has the 5.3 in it and so far all ok(knock on wood)

I worked at a Cadillac dealer for a bit and would get those Saab/trailblazers in, an oddball for sure


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Boozer

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I drove my wife’s 16 Escalade the other day and was like wow this thing has a rough idle. Looks like I need to call the dealer. Only has 45k

Is it throwing a check engine light? The check engine light in mine is blinking, from what I understand that’s an indication that it is misfiring.

The first time my Escalade ate a lifter I was up in the mountains and I got bad gas which was causing the engine to run like shit. That wasn’t the case.

At this point I’m just thankful it’s still under warranty. I was planning to keep it for several years but I’m trading it in as soon as it’s fixed. If it’s doing this crap with 60K I don’t even want to think what kind of problems it will have at 100K.




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lbhsbz

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Is it throwing a check engine light? The check engine light in mine is blinking, from what I understand that’s an indication that it is misfiring.

The first time my Escalade ate a lifter I was up in the mountains and I got bad gas which was causing the engine to run like shit. That wasn’t the case.

At this point I’m just thankful it’s still under warranty. I was planning to keep it for several years but I’m trading it in as soon as it’s fixed. If it’s doing this crap with 60K I don’t even want to think what kind of problems it will have at 100K.




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Don’t drive it if it’s blinking...that means it’s fucked up enough to damage the cats, which are not cheap
 

glamis0812

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Is it throwing a check engine light? The check engine light in mine is blinking, from what I understand that’s an indication that it is misfiring.

The first time my Escalade ate a lifter I was up in the mountains and I got bad gas which was causing the engine to run like shit. That wasn’t the case.

At this point I’m just thankful it’s still under warranty. I was planning to keep it for several years but I’m trading it in as soon as it’s fixed. If it’s doing this crap with 60K I don’t even want to think what kind of problems it will have at 100K.




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No check engine light, I need to check the motor mounts I had one go bad on our 2010.
 

Ziggy

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I worked at a Cadillac dealer for a bit and would get those Saab/trailblazers in, an oddball for sure


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They're just better looking than the Trailblazer/Envoy/Bravada models:D
 

BajaMike

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Does anyone know if the newer 6.2 Mercruiser have had this problem.....or any other engine issues?
 

Boozer

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Don’t drive it if it’s blinking...that means it’s fucked up enough to damage the cats, which are not cheap

It doesn’t even want to start now. I’m going to try and drive it to the dealer Tuesday night, if I can’t get it started it’s getting towed Wednesday morning.


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Boozer

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Does anyone know if the newer 6.2 Mercruiser have had this problem.....or any other engine issues?

It shouldn’t. The issue is caused by the AFM. The 6.2 Mercury doesn’t have AFM.


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lbhsbz

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It doesn’t even want to start now. I’m going to try and drive it to the dealer Tuesday night, if I can’t get it started it’s getting towed Wednesday morning.


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I’d tow it regardless.
 

Runs2rch

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zig any chance you could point me in the direction of that screen cleaning post

Buy the oil psi switch/sender socket. Remove the sender, small pick you can pull the screen/filter. I just replace them. Takes 15 min on a cold motor.
 

The Prisoner

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Is it throwing a check engine light? The check engine light in mine is blinking, from what I understand that’s an indication that it is misfiring.

The first time my Escalade ate a lifter I was up in the mountains and I got bad gas which was causing the engine to run like shit. That wasn’t the case.

At this point I’m just thankful it’s still under warranty. I was planning to keep it for several years but I’m trading it in as soon as it’s fixed. If it’s doing this crap with 60K I don’t even want to think what kind of problems it will have at 100K.




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I had a check engine light come on last year in Bullhead with rough idle and limped it to Findlay’s there because I didn’t want to chance it going up the hill back to Kingman. They put a new coil in and been fine ever since. 07 Escalade.
 

boatpi

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GM experts, I have a 2008 hummer H2 with a 6.2. What’s warm oil pressure runs under 40 pounds that seems awfully low do you think the screen somewhere that could be plugged ?
 

Runs2rch

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GM experts, I have a 2008 hummer H2 with a 6.2. What’s warm oil pressure runs under 40 pounds that seems awfully low do you think the screen somewhere that could be plugged ?

10 psi per 1000 rpm is all you need.
 

pull-on

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Just received a letter from GM talking about what I assume is this issue on my 2017 Silverado. Says they know they have a possible injector issue on the 5.7 and 6.2. Letter says they are giving us 10 years, or 150,000 mile cover for this issue. Letter says if you've already paid for repairs, there is a form to fill out for re-imbursement. Maybe you should push harder on the dealer ( or another) to see if your engine serial# falls into this coverage?


We just got the same letter for our 2016. So now, we have to wait for the problem to happen rather than prevent it.
 

Runs2rch

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We just got the same letter for our 2016. So now, we have to wait for the problem to happen rather than prevent it.

Might never happen. Or it could happen tomorrow. Who knows.
 

pull-on

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Might never happen. Or it could happen tomorrow. Who knows.

Totally true. And at least they've identified the issue and have a plan of action.

But what's the difference from this problem and the "lets wait and see", prior to repairing, rather than just issuing a recall and fixing a known problem? Especially before the problem leaves you stranded on the side of the road? This is more of a rhetorical question as I'm sure it's about the money.
 

4Waters

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Totally true. And at least they've identified the issue and have a plan of action.

But what's the difference from this problem and the "lets wait and see", prior to repairing, rather than just issuing a recall and fixing a known problem? Especially before the problem leaves you stranded on the side of the road? This is more of a rhetorical question as I'm sure it's about the money.
They don't actually have a fix so when it has a problem they will replace the engine but it will do it again, that's why there is no recall.
 
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I would call Cadillac road side and tell them it can’t be driven and under warrant. They should pick up the tow charges to the dealership.
 

Bigbore500r

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GM experts, I have a 2008 hummer H2 with a 6.2. What’s warm oil pressure runs under 40 pounds that seems awfully low do you think the screen somewhere that could be plugged ?
Under 40 at idle or when driving over 1500rpm?
 

Motoxxxloak

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Interesting thread. I was just reading about AFM on a Tahoe forum. We just picked up a 2017 with the 5.3. I am curious if I should buy that OBDII module.


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redone76

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If you don’t want to muck with your factory computer, and just want to disable the AFM, you can plug one of these into your OBDII port.

View attachment 800268

Remove it when you take your car to the dealer and no one will ever know.


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Tore down my buddie's truck yesterday and sure as shit...stuck AFM lifter. He has just over 200k on his truck when the lifter finally crapped out. I have 155k on my 5.3 and zero issues with the AFM. Since I don't have a current issue would this product help me from ever having a lifter failure since the AFM will be deactivated?
 
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