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Where do I start.... my 16 was built in March of 16 and I purchased it in June of 16 with 24 miles on it. I paid $47,600 for it. I got ever option I could. Duramax, long bed, z71, trailboss package, navigation, big screen, Bose sound... blah blah. The issues never stop!
My first issue was at 3,000 miles with the 4 wheel drive. It was in and out of the shop for that issue till 26,000 miles before It was finally fixed it. and weeks at a time not having a vehicle! It took me going to 2 Different dealerships and them replacing the switch 3 times the actuator. And finally it was some bad wire between the switch and computer that was bad. I was getting “service 4 wheel drive“ light. Then it started locking itself into 4 wheel drive when ever it wanted. It also locked into 4 low randomly twice on me. 1 of those times I was doing 70mph down the interstate and the truck went into 4 low. Message popped up ”reduce speed to 3 mph in 4 low”. The rpms maxed out. Gears grinding! Other vehicles behind me locking their brakes up so we don’t have a big ass pile up! Of course gm didn’t believe me cuz they said it has to be in neutral before it will shift to low. Well I proved that wrong!
15,000 ish I had a cylinoide go out in the shifter. l couldn’t put the truck in park and turn the key off. Well the fix for that was a whole new shifter!
Next is loosing oil! I have took my truck in religiously for every oil change. I started getting low oil lights. I went thru 3 oil changes before they would investigate what was going on. They said it had to be documented. So with that said. All 3 oil changes the motor was
1 1/2- 1 3/4 quarts low on oil. They said it’s in gms spects of being ok. Oil pressure was also noted for dropping down to 8 psi when at ideal. That also was in gms spects cuz it wasn’t below 6 psi. And they could never find where oil was going. Outside of motor clean, no drips. Coolant was clean, turbo clean. I’m still having that issue at 76,000 miles. So months in and out of the shop. Weeks at a time.. Never fixed!
At 46,000 miles I was driving down the open highway, empty no load... cruising 55mph and ding ding ding! “Shut engine down overheating ” light popped up! then followed by steam and coolant all over the place. So towed to shop. They looked it over and said there was a hole in the coolant tank. (Note it’s a $300 plastic tank not under warranty) So they put a new tank on after my truck sat there a week waiting on it. They started it up and boom over heated again. The problem after having it 3 more weeks! A bad head! The dealer said when they took it off and all 4 cylinders had groves in in them. Their excuse was the head wasn’t centered right when the motor was assembled. Which that’s very hard for me to believe when everything is machined to the exact. So how can you get bolt holes off that much?? So I now have a rebuild $50,000 Colorado with 46,000 miles! I told gm I wanted a new motor not a rebuild in my new truck! Well they said.. we will put a new head on forr ref now and we have to send the bad one off for testing before any decision is made. Guess what? 2 years later and haven’t heard back on them test results!
4 case numbers later months not have a truck. 76,000 on the truck and now I’m having emission codes with reduced engine power. Truck is sitting in driveway. I don’t even care to get it towed And looked at. I’m tired of it!!!
The best full mileage I ever got was 26.3 1 time. I average 20-21 no matter where or how I drive it. So not sure how it’s so low to everyone else’s on the forum lol.. I’m sure I’m forgetting something.
 

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That’s got to be one of the worst lemon stories for our trucks I’ve ever heard. I don’t blame you. I would definitely be looking to get rid of it were it my truck. Especially after the cylinder and head issue at 46k. Would have tried to get them to do a buy back.
 

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Gm mentioned the buy back but they wasn’t and still to this day fighting my issues have not progressed with anything. They have to document and text stuff. They also like to send me to different gm certified service dealers when 1 cant figure anything out.
I told gm that’s bullshit to make me run around to different shops an hour farther away from my closest one when they are all GM certified! To me they should all be able to work on the vehicles they sell. The worst part is trying to not disregard the warranty by boing the work myself or other shops that I trust. Definitely don’t trust GM.
 

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Really sorry to hear about your truck, I have an early production 16 4X4 as well, 65K miles and had 2 issues, one frayed wire causing limp mode 30K and a bad emission sensor 36K. Purchased GM extended warranty to 120K mainly because of the emission and computer issues. Recommend you find a lemon law attorney, you definitely have a case. Most will take it on contingency and only collect if you get a settlement from GM.
 

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Where do I start.... my 16 was built in March of 16 and I purchased it in June of 16 with 24 miles on it. I paid $47,600 for it. I got ever option I could. Duramax, long bed, z71, trailboss package, navigation, big screen, Bose sound... blah blah. The issues never stop!
My first issue was at 3,000 miles with the 4 wheel drive. It was in and out of the shop for that issue till 26,000 miles before It was finally fixed it. and weeks at a time not having a vehicle! It took me going to 2 Different dealerships and them replacing the switch 3 times the actuator. And finally it was some bad wire between the switch and computer that was bad. I was getting “service 4 wheel drive“ light. Then it started locking itself into 4 wheel drive when ever it wanted. It also locked into 4 low randomly twice on me. 1 of those times I was doing 70mph down the interstate and the truck went into 4 low. Message popped up ”reduce speed to 3 mph in 4 low”. The rpms maxed out. Gears grinding! Other vehicles behind me locking their brakes up so we don’t have a big ass pile up! Of course gm didn’t believe me cuz they said it has to be in neutral before it will shift to low. Well I proved that wrong!
15,000 ish I had a cylinoide go out in the shifter. l couldn’t put the truck in park and turn the key off. Well the fix for that was a whole new shifter!
Next is loosing oil! I have took my truck in religiously for every oil change. I started getting low oil lights. I went thru 3 oil changes before they would investigate what was going on. They said it had to be documented. So with that said. All 3 oil changes the motor was
1 1/2- 1 3/4 quarts low on oil. They said it’s in gms spects of being ok. Oil pressure was also noted for dropping down to 8 psi when at ideal. That also was in gms spects cuz it wasn’t below 6 psi. And they could never find where oil was going. Outside of motor clean, no drips. Coolant was clean, turbo clean. I’m still having that issue at 76,000 miles. So months in and out of the shop. Weeks at a time.. Never fixed!
At 46,000 miles I was driving down the open highway, empty no load... cruising 55mph and ding ding ding! “Shut engine down overheating ” light popped up! then followed by steam and coolant all over the place. So towed to shop. They looked it over and said there was a hole in the coolant tank. (Note it’s a $300 plastic tank not under warranty) So they put a new tank on after my truck sat there a week waiting on it. They started it up and boom over heated again. The problem after having it 3 more weeks! A bad head! The dealer said when they took it off and all 4 cylinders had groves in in them. Their excuse was the head wasn’t centered right when the motor was assembled. Which that’s very hard for me to believe when everything is machined to the exact. So how can you get bolt holes off that much?? So I now have a rebuild $50,000 Colorado with 46,000 miles! I told gm I wanted a new motor not a rebuild in my new truck! Well they said.. we will put a new head on forr ref now and we have to send the bad one off for testing before any decision is made. Guess what? 2 years later and haven’t heard back on them test results!
4 case numbers later months not have a truck. 76,000 on the truck and now I’m having emission codes with reduced engine power. Truck is sitting in driveway. I don’t even care to get it towed And looked at. I’m tired of it!!!
The best full mileage I ever got was 26.3 1 time. I average 20-21 no matter where or how I drive it. So not sure how it’s so low to everyone else’s on the forum lol.. I’m sure I’m forgetting something.
I’ve had my 2016 Duramax since June 16
150000 miles average 26.3 max 32. Been a great truck no issues. Tows like a champ
sorry you have a bad one.
 

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Discussion Starter #6
Really sorry to hear about your truck, I have an early production 16 4X4 as well, 65K miles and had 2 issues, one frayed wire causing limp mode 30K and a bad emission sensor 36K. Purchased GM extended warranty to 120K mainly because of the emission and computer issues. Recommend you find a lemon law attorney, you definitely have a case. Most will take it on contingency and only collect if you get a settlement from GM.
Thank you. Problem is finding one
 

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I have a 2016 with 58k on it. I'm constantly amazed by the 2.8 Duramax. Love it.
 

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I have a 2018 Z71 Duramax, 4WD, CCLB, Bose/Nav. This is my 3rd Colorado but my 1st Duramax and it's Great!
 

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So I purchased a 2019 and I am only right before bumper to bumper ends and my story is as big. Constant codes and reduced power. Replaced turbo, belts, tensioner ect. Just a matter of time before I am out of warranty and up a **** creek. But other than that, when it’s running, I love my truck. 3000 mile road trip planned for June pulling 4000 lb 20” trailer. But what can you do but live and hope. GM is on the right path but cutting corners and up against environmental laws to make a profit. Good luck to all you Colorado lovers
 

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It seems to me that there are two locations the Colorado's were being built. My early 2016 (built March 7) was built in Missouri and I believe a friend of mine's was built in Mexico. Engine says it was built in Thailand (oh ****) but I wonder if we can trace the bad ones back to a one location. I have 58k on mine, a Duramax Tuner and K&N since before 10k and no real problems after the first year.
 

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All the 2.8 Duramax engines are made in Thailand. Any problems have less to do with assembly and more to do with parts procurement.
 

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All the 2.8 Duramax engines are made in Thailand. Any problems have less to do with assembly and more to do with parts procurement.
Not for long, GM is pulling out of Thailand by the end of this year: "General Motors is leaving these markets"

The Thai and Aussie markets are where the Colorado originated so I'm wondering if we're looking at a re-platform of the entire truck or engine in the future...
 

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Not for long, GM is pulling out of Thailand by the end of this year: "General Motors is leaving these markets"

The Thai and Aussie markets are where the Colorado originated so I'm wondering if we're looking at a re-platform of the entire truck or engine in the future...
That opens a new discussion for another thread on the future of the 2.8
 

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Mine was assembled in Missouri!!
Mine as well.

I should have clarified 'origin' as the original introduction of the current Colorado model was overseas in 2012, mine was assembled in the USA also but the platform as we now see it was introduced in Thailand and Australia and Brazil long before we saw it. The major reason for the pullout of those markets is the 'Holden' GM brand is failing down under and I guess Thailand is not that great of a market to justify staying there.

Also note that I'm just sitting here on my computer poking around on a holiday and not an expert on anything except that bacon tastes wonderful :)
 

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Discussion Starter #17
I’ve had my 2016 Duramax since June 16
150000 miles average 26.3 max 32. Been a great truck no issues. Tows like a champ
sorry you have a bad one.
Are you running stock tires? My fuel mileage sucks. It really always has. The best I can get in the past 2 years is 22. 19-20 average. Now the only thing I can think of is I up the tire size to match the size of the spare tire. I was surprised when I had to use my spare and I noticed it was bigger then what came on the truck when I bought it.
 

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Are you running stock tires? My fuel mileage sucks. It really always has. The best I can get in the past 2 years is 22. 19-20 average. Now the only thing I can think of is I up the tire size to match the size of the spare tire. I was surprised when I had to use my spare and I noticed it was bigger then what came on the truck when I bought it.
Are you running stock tires on yours? Also, have you had any issues with your truck and had to take it to the dealer? I ask because there was an old member on here, Mr. Bones, who had a Colorado that was having issues, was stock at that point, and constantly getting poor fuel economy. Finally figured out that his truck was stuck in regen all the time I believe, so it was constantly burning more fuel. Just a thought.
 

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Are you running stock tires on yours? Also, have you had any issues with your truck and had to take it to the dealer? I ask because there was an old member on here, Mr. Bones, who had a Colorado that was having issues, was stock at that point, and constantly getting poor fuel economy. Finally figured out that his truck was stuck in regen all the time I believe, so it was constantly burning more fuel. Just a thought.
I have had multiple issues with the truck. I have posted on here the history Iv had. I would link it but not sure how. I’m running spare tire size on the truck. I believe it’s 265 70 17. Don’t quote me. That’s what the spare was and the stock was smaller then spare. But that would make since. My truck is at 79,000 and it’s been in the shop for a week now. I had a reduced power and engine light come on. I ran the code before I took it in and it said exhaust temperature sensor B... I still haven’t got truck back and they haven’t figured anything out I guess because they haven’t called back letting me know.
mid you can find my first post it will tell you all that Iv delt with since I bought new in 16
 

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I have had multiple issues with the truck. I have posted on here the history Iv had. I would link it but not sure how. I’m running spare tire size on the truck. I believe it’s 265 70 17. Don’t quote me. That’s what the spare was and the stock was smaller then spare. But that would make since. My truck is at 79,000 and it’s been in the shop for a week now. I had a reduced power and engine light come on. I ran the code before I took it in and it said exhaust temperature sensor B... I still haven’t got truck back and they haven’t figured anything out I guess because they haven’t called back letting me know.
mid you can find my first post it will tell you all that Iv delt with since I bought new in 16
My bad. All I had to do was scroll up to see your issues, I had forgot I had replied once already to this thread.

Anyways, your issue with the oil could be due to the oil being lost to the intercooler due to blow-by from exhaust gasses (I believe that's how it happens). Adding a catch-can to the truck could help this. I believe every 2.8 has this issue, of blow-by, but losing 1+ quart per oil change is rather excessive. So maybe it's something else...or maybe you are losing that much that is going into the intercooler and PCV. I know mine was absolutely filthy with oil residue when I added my catch can and that was just looking at the PCV: I never investigated the intercooler, I just took everyone else's word for it. You can get a good can and set up for relatively cheap (under $200). I collect 1-2 oz. of oil per oil change usually.

The other issues though, I don't know. They finally got your 4x4 issues resolved and the scored cylinder head issue could be the reason for your poor fuel economy. Have you got to drive the truck to see if things have improved since they rebuilt or replaced the engine basically, or do they still have the truck?
 
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