GM 8 speed transmission problems- read this if you have one

 

Last year my 2016 GMC Sierra had a terrible "shuddering" problem. When it first started it was very mild, almost like a wheel balance problem. One day though, it got so bad the truck was shuddering so bad that things were making noise in the console.

I took it to the dealer and they said it was a known problem and that the transmission manufacturer had used an unapproved fluid. They changed the fluid and the problem went away immediately. This was a complete fluid change including the torque converter - took 5 hrs.

About 2 months ago the problem returned and back to the dealer. At this point I was out of the 50,000 mile factory warranty, but I have the extended warranty purchased through the dealer, I wasn't worried too much.

Well, the dealer found metal particles in the transmission pan and the warranty company authorized a GM rebuilt transmission. Transmission was ordered by parts department. Transmission shipped from Pontiac, MI via Fedex. Label falls off or was damaged and transmission sits in limbo. Dealer inquires with GM as to what happened. Transmission gets returned to GM and is lost again and probably was sent to another dealer. Dealer orders another transmission. It is now on National Back Order (NBO). Dealer makes complaints to GM. Transmission was shipped Thursday (maybe) and is supposedly on it's way.

It's now going on 8 weeks without my truck and I am not a happy camper. This is all due to this model transmission being used in 17 different vehicle models and having a manufacturing problem or a design flaw. And now they are failing everywhere (72,000 miles later for me).

If you own one of the following models, and are having problems, go to the dealer, not an independent shop. Even if you are out of the factory warranty and do not have an extended warranty, if you make a stink with GM, they may cover it.

2015-2017 Cadillac Escalade
2015-2017 Cadillac Escalade ESV
2016-2019 Cadillac ATS
2016-2019 Cadillac ATS-V
2016-2019 Cadillac CTS
2016-2019 Cadillac CTS-V
2016-2019 Cadillac CT6
2015-2019 Chevrolet Silverado
2017-2019 Chevrolet Colorado
2015-2019 Chevrolet Corvette
2016-2019 Chevrolet Camaro
2017-2019 GMC Canyon
2015-2019 GMC Sierra
2015-2019 GMC Yukon
2015-2019 GMC Yukon XL
2015-2017 GMC Yukon Denali
2015-2017 GMC Yukon Denali XL

See:
https://gmauthority.com/blog/2019/08/tsb-seems-to-fix-8-spee...

https://gmauthority.com/blog/2020/04/general-motors-looks-to...

BTW The transmission for my truck retails for $2922.93 USD with a core charge of $1500.00. Labor over $1000 (4WD).

Edit: List in lawsuit article listed 17 vehicles, not 13.

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Metricman Nuvi 660, GTM-20 Traffic Receiver Nuvi 3597 GTM-60 Traffic Receiver Williamsburg, VA

1970 GMC C-2500 pickup

In the 1980s I bought a used 1970 GMC C-2500 3/4 ton pickup with a 350 cid 8-cylinder engine. This was GM's most common engine. The body was good, but after putting some miles on the truck an engine banging noise started.

My trusted local repair shop couldn't diagnose the noise, but it had to be bad. The choices - a rebuild or a new engine. The GMC dealer had a factory-new GMC Targetmaster complete engine for $1,250-, an unbelieveable deal. My shop installed it. This was the last job the mechanic did before leaving for dental school!

It wasn't long before the new engine started banging not unlike the old engine. The compression test showed low compression in 4 cylinders. Just for due diligence, I decided to torque the head bolts.

On first viewing the cylinder heads, each one had "hecho en Mexico" cast in. Melaqueman can tell you it means "made in Mexico." I am just reporting the facts.

Half the head bolts spun with little torque! - They were stripped!

I junked the truck and got $35- for it.

It was the last GM product I ever bought!

dobs108 shock

Correct dobs108

On my way into and out of Mexico between Laredo and just south of San Luis Potosi, a distance of about 800 km or 500 miles from the border I see dozens of car carriers loaded with passenger cars heading north. Also a steady stream of "Freightliner", "International" and "Kenworth" trucks, about 4 of them all carried by one truck, heading for Laredo and into the USA.

The cars are not identifiable since they carry no emblems and I assume they get attached once they are in the USA.

There is a whole huge industrial complex just south of San Luis Potosi where a lot of them come from though the actual buildings have no identifiable signage on them

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Nuvi 350 long gone, Nuvi 855LMT, Nuvi 2797LMT, DriveSmart 50 LMT-HD, 3790LMT now my daughters. Using Windows 10. DashCam A108C with GPS.

GM only for me

dobs108 wrote:

In the 1980s I bought a used 1970 GMC C-2500 3/4 ton pickup with a 350 cid 8-cylinder engine. This was GM's most common engine. The body was good, but after putting some miles on the truck an engine banging noise started.

My trusted local repair shop couldn't diagnose the noise, but it had to be bad. The choices - a rebuild or a new engine. The GMC dealer had a factory-new GMC Targetmaster complete engine for $1,250-, an unbelieveable deal. My shop installed it. This was the last job the mechanic did before leaving for dental school!

It wasn't long before the new engine started banging not unlike the old engine. The compression test showed low compression in 4 cylinders. Just for due diligence, I decided to torque the head bolts.

On first viewing the cylinder heads, each one had "hecho en Mexico" cast in. Melaqueman can tell you it means "made in Mexico." I am just reporting the facts.

Half the head bolts spun with little torque! - They were stripped!

I junked the truck and got $35- for it.

It was the last GM product I ever bought!

dobs108 shock

I have been driving GM products for over 60 years. The best one was my mother's 66 Chevelle with a 327 engine. The engine was made in Tonawanda, NY. I inherited it when she died. It lasted over 340,000 miles without an overhaul and it didn't smoke when it was given to a mechanic friend for the engine. He put it in to his son's pick-up and the son drove it for 4 years. It did blow a head gasket while he had it but no other major problems. He sold it to a friend that got drunk one night and rolled the truck. Don't know what happened to it after that.

This is the first major problem I've had with any GM vehicle in a long, long time. Last major repairs were on a Vega. Before any one chirps in, I ask you - seen any Pintos or Crickets in the past 20 years? All 3 models that were "Rush to market" that failed.

At any rate, whatever you prefer to buy is up to you.

--
Metricman Nuvi 660, GTM-20 Traffic Receiver Nuvi 3597 GTM-60 Traffic Receiver Williamsburg, VA

True

Melaqueman wrote:

On my way into and out of Mexico between Laredo and just south of San Luis Potosi, a distance of about 800 km or 500 miles from the border I see dozens of car carriers loaded with passenger cars heading north. Also a steady stream of "Freightliner", "International" and "Kenworth" trucks, about 4 of them all carried by one truck, heading for Laredo and into the USA.

The cars are not identifiable since they carry no emblems and I assume they get attached once they are in the USA.

There is a whole huge industrial complex just south of San Luis Potosi where a lot of them come from though the actual buildings have no identifiable signage on them

True, many vehicle manufacturers "Assemble" them in Mexico due to the lower labor costs. BUT most of the parts are made elsewhere. Either on the factory window sticker, or on a decal somewhere on the vehicle, is a listing of what percentage of where the majority of the parts came from and the percentage made "elsewhere".

I worked for Siemens and was at a factory in Canada for a month checking for "leaky" fuel injectors. The bodies were "stamped" there at the factory and robotically assembled there. Most of the other parts came from the U.S. though.

Most vehicles have numerous electronic components and even though most of the electronic Black Boxes are assembled in the USA, just about all the individual parts on the circuit board are made in Asia.

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Metricman Nuvi 660, GTM-20 Traffic Receiver Nuvi 3597 GTM-60 Traffic Receiver Williamsburg, VA

as a GM owner

I can honestly say the ownership experience is awful. Owned a GM since Labor Day 2011.

I've tried every GMC dealership within 50 miles with the hopes the dealerships were simply bad in my area.

It took 1.5 years to fix a captain's chair under warranty. One and a half years, in case you thought that was a typo.

Going to a GMC dealership is like walking into 1983, the decor, the mentality, the customer service.

Here's an interesting thing, I bought my used Lexus from a GMC dealership in a very wealthy area. It would likely be where the Clintons service their secret service vehicles. The car had bad brakes and a broken door actuator which I did not discover upon test driving it. They fixed it gratis, with Lexus OE parts, returned the old parts to me in the Toyota boxes.

When I talked to the service manager? He said it s**** servicing GM vehicles, it's terrible. We have to feed customers this line of **** like they're kids, Good/Better/Best. They're ****** brake rotors for pete's sake! He didn't last lol

btw GM changed it to OE Gold and Silver, any way you slice it, they charge extra to get what came from the factory, on some parts, such as a brake job.

Like I said, on my wife's, there's a TSB for burned out DRL bulbs going back to the 90's. If customer complains, switch from a 3157 to a 4114 bulb. And like I said, on the GMC version of the vehicle, since the bulb is inside of a HID headlamp, customer is out $1000 per side. My wife's is in the bumper.

This is my last car made in Detroit, sorry. It's my hard earned money.

Last story, right front strut leaking, covered by warranty. They replaced one strut and did a one wheel alignment hahahahahahahahahahahaha

I actually have them in my shed now since the Bilsteins went in last Thu., and I can see one is 9 years old, the other maybe 2, by appearance.

my

metricman wrote:
dobs108 wrote:

In the 1980s I bought a used 1970 GMC C-2500 3/4 ton pickup with a 350 cid 8-cylinder engine. This was GM's most common engine. The body was good, but after putting some miles on the truck an engine banging noise started.

My trusted local repair shop couldn't diagnose the noise, but it had to be bad. The choices - a rebuild or a new engine. The GMC dealer had a factory-new GMC Targetmaster complete engine for $1,250-, an unbelieveable deal. My shop installed it. This was the last job the mechanic did before leaving for dental school!

It wasn't long before the new engine started banging not unlike the old engine. The compression test showed low compression in 4 cylinders. Just for due diligence, I decided to torque the head bolts.

On first viewing the cylinder heads, each one had "hecho en Mexico" cast in. Melaqueman can tell you it means "made in Mexico." I am just reporting the facts.

Half the head bolts spun with little torque! - They were stripped!

I junked the truck and got $35- for it.

It was the last GM product I ever bought!

dobs108 shock

I have been driving GM products for over 60 years. The best one was my mother's 66 Chevelle with a 327 engine. The engine was made in Tonawanda, NY. I inherited it when she died. It lasted over 340,000 miles without an overhaul and it didn't smoke when it was given to a mechanic friend for the engine. He put it in to his son's pick-up and the son drove it for 4 years. It did blow a head gasket while he had it but no other major problems. He sold it to a friend that got drunk one night and rolled the truck. Don't know what happened to it after that.

This is the first major problem I've had with any GM vehicle in a long, long time. Last major repairs were on a Vega. Before any one chirps in, I ask you - seen any Pintos or Crickets in the past 20 years? All 3 models that were "Rush to market" that failed.

At any rate, whatever you prefer to buy is up to you.

My grandfather and dad were GM folks. I have Buick and Olds catalogs going back to the 60's. I was resolved to buy American and buy GM, and finally did in 2011. It was a mistake. lol

Oh I'm not getting rid of it just fixing a lot of stuff in my driveway that shouldn't need fixing, I'm resolved to never have a car payment until maybe I'm retired and get a Corvette, wait, that's GM, ok, well I'm making an exception. Prolly a 2019 C7 Grand Sport since that's the last year with a stick...

Oh wait I have to throw in this story. I was at the dealer, and this senior was very unhappy with his prior service. The service advisor came in and told him we think we might know what's happening with your Buick Regal (that's sort of a nice car, it was under warranty), and he says, and I quote: "Oh, by the time you figure out what's wrong with it, I'll be dead."

The service advisor looked at him, and walked away. That's tragic, i.e. no empathy and no customer service skills. The customer was basically begging to have some assuarance they knew what they were doing, but nothing.

In 2011, after 13 years it

In 2011, after 13 years it was time to part with my '97 z28 6mt (~85K miles). The car was stored outdoors in the chicago area its entire life. One summer afternoon, not far from home, a brake line blew. It's a scary feeling having the brake pedal sink to the floor as you try to stop. Fortunately it was on a frontage road with no traffic.

I had the car towed to a shop. The repair estimate was somewhere in the ball park of $3-4K dollars.

Every imaginable gasket leaked at either end of the car. In addition, shop was concerned replacing brake lines may cause damage to fuel lines in the process.

I put it up on craigslist for $3500. It sold within a day. The kid that bought it asked if he could drive to pepboys. Told him once its off my property and title signed he can do what ever he wants. However, I don't advise it.

It left on a flatbed. Good riddance.

Contact the manufacturer

Whenever you think you have had a bad experience at ANY dealership, you should go online to the manufacturer's website and locate their contact info. Either call, write or email them and let them know how you were treated and how you feel about it. They don't want to lose business and if a dealership is giving bad service, they will try to have it corrected. They track complaints and compliments and the dealership performance will affect the incentives the manufacturer gives the dealership. Enough complaints and the dealer will be put on probation and/or possibly face losing the franchise.

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Metricman Nuvi 660, GTM-20 Traffic Receiver Nuvi 3597 GTM-60 Traffic Receiver Williamsburg, VA

Moisture in fluid??

Excessive fluid in the transmission fluid is now suspect, rightfully or wrongfully.

The current TSB calls for replacement of the fluid with a Mobil 1 product instead of the GM fluid. See https://gmauthority.com/blog/2019/08/tsb-seems-to-fix-8-spee... for the details. I do have to say that a synthetic product like the suggested Mobil 1 product is much less susceptible to issues due to moisture.

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John from PA

Thanks for the Info

Thanks for the heads up. A good friend of mine just recently bought a used vehicle on this list. I will pass it on to him.

I meant excessive moisture in the transmission fluid

Sorry, edit doesn't seem available but excessive moisture is now suspect.

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John from PA

On my

John from PA wrote:

Excessive fluid in the transmission fluid is now suspect, rightfully or wrongfully.

The current TSB calls for replacement of the fluid with a Mobil 1 product instead of the GM fluid. See https://gmauthority.com/blog/2019/08/tsb-seems-to-fix-8-spee... for the details. I do have to say that a synthetic product like the suggested Mobil 1 product is much less susceptible to issues due to moisture.

Wife's car, first time I used ACDelco branded Dexron VI. I don't think it's synthetic. Then I used a universal synth made by Valvoline. The third time I used Amalie Dexron VI synth.

I followed the advice online having not had an auto trans since 1998, to never flush and only drain/fill. So in doing so it's like only 5/11 qts. come out. And multiple drain/fills would need to be done just to get it to 80% new and 20% old. At $5-$6/qt when buying a case at a time, how many times is one willing to do a drain and fill basically wasting new fluid? conventional wisdom says 3, and that's it. 4 if you really want to get down to say 11% old, from 19%. 6 quarts wasted to do that.

Also I learned the drain plug is tapered and needs sealant, I was thinking hmmmm it's not like a drain plug for oil where it bottoms and meets the pan. the bolt only goes about 1/2 in and sticks out.

I'm skeptical about fluid as Dexron VI is a license. So does universal not work? How can a licensed Dexron VI be also ok for Mercon IV? Not sure...I've also heard with Toyota do not use anything but Toyota WS. If anything, I'd want to stick with what came with the car, "IF" issues are present. And GM TSBs are nuts. Bad water pump from 2008-2010, we'll replace it 10/120. 2011+ we'll top off your reservoir lol (I'm not making it up)

Yeah, that's no good. Same

Yeah, that's no good. Same with hyundai and their theta engine - I got a short block (crank, pistons and rods)lifetime warranty out of it.

Finally!

Finally, after 6+ weeks I have my truck back and it seems to be operating better that it has for a long time.

Transmission came in last Saturday. Dealership started work yesterday (Monday) and finished up this morning (Tuesday). Can't blame the dealership for the delay. We will be contacting GM to see if we can get any compensation for the rental car.

This is one time that an extended warranty was really worth it. Invoice was $5955.25 USD. I got the extended warranty for $800 with $100 deductible.

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Metricman Nuvi 660, GTM-20 Traffic Receiver Nuvi 3597 GTM-60 Traffic Receiver Williamsburg, VA

good deal

metricman wrote:

Finally, after 6+ weeks I have my truck back and it seems to be operating better that it has for a long time.

Transmission came in last Saturday. Dealership started work yesterday (Monday) and finished up this morning (Tuesday). Can't blame the dealership for the delay. We will be contacting GM to see if we can get any compensation for the rental car.

This is one time that an extended warranty was really worth it. Invoice was $5955.25 USD. I got the extended warranty for $800 with $100 deductible.

Glad you have your car back, for we ordinary people, it matters. I have to put an engine mount in my wife's. I wish I could do it right now as I have the part.

I too bought the extended warranty from a dealer in MI, no tax that way. When I told my buddy it paid for itself, he said man you think like Doug Demuro, he got an extended warranty on a Range Rover from Carmax and it had 18k of repairs. He said better to buy a reliable car instead lol

But seriously the dealer didn't provide a loaner? One time they gave us a Buick Encore and the bad luck was we had 2 guests coming in from out of town. It's so small even 4 pepole are uncomfortable. So the next time I told the guy and I was pushy, you better give us a new Suburban, and they did. It was too big for our driveway, but if you're working on a SUV, shouldn't we have one in return? I should have said Tahoe not Suburban.

I admit the Japanese and German car dealers seem to be better with the loaners, GMC makes it so you have to ask.

GM cars are not cheap to repair--my wife's alternator was over $1,000 but under warranty--2 hours labor, $706 for the part. My buddy said c'mon, you know you would never pay that, you'd DIY for $120 lol