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2016 6.2L Lost Compression

12ZL1-16Z71

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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.

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