Jump to content

2016 6.2L Lost Compression

12ZL1-16Z71

Recommended Posts

12ZL1-16Z71 Enthusiast

12ZL1-16Z71

Posted
Posted

Started heading to work this morning and about a mile down the road my truck started misfiring. I pulled into a parking lot and checked the plug wires and tried again...still misfiring. Check engine light flashed and the stabilitrac light came on. No limp mode that i could tell, but I took it easy. Drove it back home and called for a tow into the dealer. I didn't get a chance to pull codes as I was late for work.

 

Couple hours later I get a call that I lost compression in one cylinder and they had to tear down the engine to figure out why.

 

Any others have this issue?

 

I'll update as I hear back in hopes it helps someone down the road.

 

2016 silverado 1500 LTZ, 6.2L, 8 speed, Crew, 16,500 miles

martinto Enthusiast

martinto

Posted
Posted

Traveling cross country, GMC SLT 6.2 w/max tow, pulling a 7200lb TT. 3800 miles on the truck. In Iowa, 8 miles after leaving campground. Heard "chatter" or ticking...thought it was spark knock. The dashboard lite up like yours. Lost power, but was able to roll at about 15-20 mph back to the campsite. Dealer 30 miles away thought injectors?? Replaced, but got at error code, had to call GM Tech Support. It was a failed lifter and some damage to the piston rod??? They replaced the bank of 4 lifters, the next day!!! On the road 1 day later. Nervous a bit with 12,000 ft elevations still ahead of me. Nary a problem...performed as it should.

 

Backstory:

 

I think GMC Customer Service "motivated" the dealer to get it fixed or get me a truck to continue my trip...WOW! Even said, if my truck gets laid up, they would provide a truck for the trip, fix mine and ship it back to South Carolina...I was impressed!

12ZL1-16Z71 Enthusiast

12ZL1-16Z71

Posted
  • Author
Posted

Luckily I wasn't on a long trip with the kids! I can't complain so far...called roadside assist and they were quick to pick it up. The dealer was out of loaners, but they pulled a brand new silverado off the lot with only 3 miles on it for me. I'm just hoping it didn't send metal shavings around the engine...or if so, it's so bad I get a new engine. I suppose worst case is I HAVE to get a new truck and trade it in again before the warranty is up!

amxguy1970 Senior Enthusiast

amxguy1970

Posted
Posted

Ouch!!

mines only at 7000 miles, I hope it's not a time bomb waiting to happen.....

 

:banghead: One or two people with an issue does not make it a "time bomb", come one man, don't go fishing for false rumors to spread....

 

Tyler

 

wonder if a lifter failed on the shitty AFM

 

Shitty AFM, yeah because every truck has a problem and it doesn't return better mpg than without it... :crackup:

 

Tyler

12ZL1-16Z71 Enthusiast

12ZL1-16Z71

Posted
  • Author
Posted

Just talked to the dealer and a lifter 'collapsed'. They're still inspecting parts so not sure what all will need to be replaced.

 

As far as I am able to tell this isn't all that common, so no need to be worried. I really just created this thread for someone else to find later on if they have the same symptoms. I tried searching after it happened and couldn't find much.

 

This is one of 5 new GM vehicles I've bought in the last 5 years, not to mention all the used I bought before them. This is the ONLY issue I have had on a non wear item other than a fule pressure regulator on 2002 that cost me $50 and 30 mins to replace. And the service I've had so far has been great.

12ZL1-16Z71 Enthusiast

12ZL1-16Z71

Posted
  • Author
Posted

Verdict is in....#6 intake valve stuck. Pushrod and rocker arm also damaged along with oil pressure sensor retaining tab broke off.

 

Barely 24 hours from when I called roadside assist and they called for me to pick up my truck.

 

Hopefully this is the last issue, but I can't complain at all.

Mark Diedrich Enthusiast

Mark Diedrich

Posted
Posted

 

:banghead: One or two people with an issue does not make it a "time bomb", come one man, don't go fishing for false rumors to spread....

 

Tyler

 

 

Shitty AFM, yeah because every truck has a problem and it doesn't return better mpg than without it... :crackup:

 

Tyler

Mark Diedrich Enthusiast

Mark Diedrich

Posted
Posted

Sorry that you feel I am fishing, just made a comment as in I hope​ it stays at​ small # and doesn't grow. My dealer has had 3 with the 6.2 in for lifter issues recently also.

I know my luck, and it's not great, so yes I'm hoping it's not bad. I've had lifter issue with my G8 just out of warranty time wise, not mileage as it had less than 50,000 ...

issues with a Ford 4.6 where the rod bearings spun at 100,000 very rare on that motor...

and a Bonneville 3.8l at 100,000 were the #1 cylinder connecting pin worked loose. Mechanic said he had only seen 3 do that on 3.8 motor all at the 100,000 mile mark and all on the#1 cylinder....... So basically if I can get a positive outcome on a motor for change, I'll be happy, but I seem to get the one offs! And it cost me$$$$

Dnt Senior Enthusiast

Dnt

Posted
Posted

Sid happens sometimes I guess. I like the 6.2 engine and I sure hope it holds up well. How much would the repair have been if it had been OUT OF WARRANTY?

12ZL1-16Z71 Enthusiast

12ZL1-16Z71

Posted
  • Author
Posted

I'm not sure what it would have cost if put of warranty. My invoice didn't list prices or hours. Since it was turned around so fast my guess would be $1,000 give or take. I can't imagine parts were too much...mostly dealership labor.

 

I've have three 5.3s and at this point would buy another 6.2 in a heartbeat. I get better has mileage in my 2016 6.2 than I did in my 2013 5.3 plus about another 110hp and 130ft lbs.

'17 Sierra Enthusiast

'17 Sierra

Posted
Posted

Verdict is in....#6 intake valve stuck. Pushrod and rocker arm also damaged along with oil pressure sensor retaining tab broke off.

 

Barely 24 hours from when I called roadside assist and they called for me to pick up my truck.

 

Hopefully this is the last issue, but I can't complain at all.

I like your attitude. Glad it went well and my bet is that it won't happen again.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.3k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,716
    Total Members
    8,960
    Most Online
    BDS my HD
    Newest Member
    BDS my HD
    Joined

  • Who's Online   4 Members, 0 Anonymous, 609 Guests (See full list)

  • Latest Articles

  • Posts

    • BDS my HD
      Brand new to this forum. Questions about re-gearing my 26’ HD

      By BDS my HD · Posted

      Hello hello looking forward to expanding my knowledge of the 2026 2500 HD that I just bought.   Truck has 3500 miles on it four-wheel-drive crew cab and I’m about to put a 6 1/2 inch BDS lift on it 18 x 10 -25 offset with 37’s   Already have the wheels and tires just waiting on the lift install in about three weeks   Question what surprises am I not gonna be happy with?  I’m not new to lifted trucks so I know that acceleration towing gas mileage all that is affected..   Question is those of you that have this truck this powertrain with a 10 speed Allison and have done the mods that I’m doing,,, how bad is it? Is that Allison constantly gonna be hunting for the right gear to go into? And what about towing, acceleration, fuel consumption as mentioned?    Lastly how come I can’t find any ring pinion gear set up for these axles and when could I expect to see them?   I apologize if there’s any typos I’m doing speech to text on my iPhone.    
    • linc45bn
      2013 2500HD 6.0L intermittent no crank no start

      By linc45bn · Posted

      I've got a 2013 2500 6.0L Flexfuel. Drove the truck earlier today with no issues. Went to run an errand tonight and noticed key fob wouldn't work. Figured battery was dead, so replaced fob batter. Still wasn't working. Grabbed my other set of keys with the other fob and that one wasn't working either. So I manually unlock truck and insert key. Interior lights come on, dashboard lights up, turn key and truck starts. Turn truck off, like a moron, and try starting again. This time no crank, no click, no nothing. Lights still come on and dash lights up, but now I'm getting a service 4wheel drive, service tire monitor, etc. Check voltage on battery and Im showing 12.2v. Throw my battery charger on it and give it 15 mins and try starting again. But still no crank no start. Decide maybe its a bad battery, run to autozone grab a new one and put it in. Same issue. Disconnect battery and let it sit for 15 mins. Try again and still nothing. I had managed to roll the windows down earlier as its a humid night, but now I can't get them to roll up. Power locks are also not working now. Then randomly I try the key again, and it fires right up. Immediately I roll up the windows as we have nothing but rain forecast this week. I shut it back off wait 30 seconds and start up again. Worked a 2nd time. So turn it off, start putting things back together. Try one more time, and back to no crank no start. And now the car alarm starts going off. Had to disconnect battery and leave it that way for the night as I don't think my neighbors would appreciate my alarm going off again tonight. Any thoughts or help would be appreciated. 
    • Grumpy Bear
      first oil change - 2026 2500HD gas

      By Grumpy Bear · Posted

      No one will care for you like you care for you. Do what you can for as long as you can. IMHO of course. 
    • Grumpy Bear
      Oil Consumption

      By Grumpy Bear · Posted

      How about them NICKS!!! 
    • Peoplemvr
      GMC 1500 Illuminated Front Grill Emblem REPLACEMENT.

      By Peoplemvr · Posted

      Hi there.  Long time lurker, first post.    i have read the previous posts regarding the water ingress problem with this emblem.  I bought my 1500 SLT the  summer of 2025 new and after reading the MANY problems with these emblems failing I decided to install one anyways.  As per a YouTube video, I sealed ( or tried to) this sign with silicone sealant around the outer perimeter joint and the holes that were already somewhat sealed on the rear plate of the emblem.  And installed the connector assembly using dielectric grease on the connectors. The installation looked great and worked well for about 4 months……then FAILURE.  Grrrrrr…… I live in the great white north and wash my truck weekly in an automatic car wash  to keep the salt off.  Let me tell you that removing the old, failed emblem is a whole different animal than removing the OEM individual letters without removing the grill assembly. Mainly because the illuminated logo is built differently than the original letters which  you can remove the red surface lettering with a knife or some kind of blade which gives access to the tabs which hold the logo onto the grill. So I had to essentially destroyed the old emblem to remove it. Doing so killed my chance of doing somekind of autopsy on the failed , old logo.  But there was plenty of water inside when I ripped it apart.  Prior to installing the new assembly I tried it with the old harness and it works fine.   Does anyone have any insight as to where the water is getting into this emblem? I intend to seal the new logo with slow curing epoxy this time around using a syringe.  I think this newer emblem may be an updated unit which I hope GM got the vendor to fix. It has an October 2025 date on it.    If this one  fails,  I am just going to revert back to the non-illuminated letters….AFTER PULLING THE GRILL.    Any thoughts on sealing with epoxy would be appreciated. Thx!   Doug  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...