C8 problems
Drifting
Joined: Mar 2020
Posts: 1,568
Likes: 1,022
From: 31 hours East of Peoria, AZ
From https://www.buyacar.co.uk/cars/autom...automatic-cars
Top 10 most reliable used automatics by manufacturer
Manufacturer % of policies with a fault claim- 1. Lexus 0.14
- 2. Aston Martin 0.26
- 3. Smart 0.33
- 4. Suzuki 0.47
- 5. Honda 0.50
- 6. Mazda 0.51
- 7. Toyota 0.53
- 8. Porsche 0.71
- 9. Skoda 0.81
- 10. Maserati 0.81
Manufacturer % of policies with a fault claim
- Renault 4.28
- Fiat 4.20
- MG 3.87
- Chevrolet 3.30
- Ford 3.14
I have had
The other
To put this into perspective, from the above stats, for every Lexus broken tranny, there would be 23+ broken Chev trannies.
GM has to do a much better job with the sturdiness of their transmissions.
Last edited by JVi; Jun 23, 2021 at 08:23 AM.
Advanced
Joined: Sep 2020
Posts: 80
Likes: 19
From: Georgia
Advanced
Joined: Sep 2020
Posts: 80
Likes: 19
From: Georgia
Intermediate
Joined: Jan 2021
Posts: 29
Likes: 57
So at risk of making a duplicate post, the frunk has twice now refused to open by normal means, ie door button, key fob button, and/or button under drivers headlight. Mechanism is not activating, didn't see any dash warnings, only way to get into the frunk (and reset the system) was to pull the manual frunk release cable. Anyone else?
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Racer
Joined: Mar 2014
Posts: 321
Likes: 84
From: Marco Island FL
You do know that GM does not manufacture the C8 transmission. Your statistics are not
This stat is not directly indicative of the numbers involved but these numbers are not encouraging for Chev products.
From https://www.buyacar.co.uk/cars/autom...automatic-cars
Manufacturer % of policies with a fault claim
I have had4 5 Lexii in the last 16 years; one was a definite lemon (RX300 - experimental model likely) that had the worst transmission I have ever experienced.
The other3 4 are rock solid and bullet proof.
To put this into perspective, from the above stats, for every Lexus broken tranny, there would be 23+ broken Chev trannies.
GM has to do a much better job with the sturdiness of their transmissions.
From https://www.buyacar.co.uk/cars/autom...automatic-cars
Top 10 most reliable used automatics by manufacturer
Manufacturer % of policies with a fault claim- 1. Lexus 0.14
- 2. Aston Martin 0.26
- 3. Smart 0.33
- 4. Suzuki 0.47
- 5. Honda 0.50
- 6. Mazda 0.51
- 7. Toyota 0.53
- 8. Porsche 0.71
- 9. Skoda 0.81
- 10. Maserati 0.81
Manufacturer % of policies with a fault claim
- Renault 4.28
- Fiat 4.20
- MG 3.87
- Chevrolet 3.30
- Ford 3.14
I have had
The other
To put this into perspective, from the above stats, for every Lexus broken tranny, there would be 23+ broken Chev trannies.
GM has to do a much better job with the sturdiness of their transmissions.
Drifting
Joined: Jul 2019
Posts: 1,766
Likes: 1,244
From: Central Texas
St. Jude Donor '21
So at risk of making a duplicate post, the frunk has twice now refused to open by normal means, ie door button, key fob button, and/or button under drivers headlight. Mechanism is not activating, didn't see any dash warnings, only way to get into the frunk (and reset the system) was to pull the manual frunk release cable. Anyone else?
Drifting
Joined: Mar 2020
Posts: 1,568
Likes: 1,022
From: 31 hours East of Peoria, AZ
This does not invalidate any stats.
Last edited by JVi; Jun 23, 2021 at 02:37 PM.
Pro
Joined: Sep 2003
Posts: 748
Likes: 372
From: Fargo, ND
The data is almost three years old, September of 2018 (follow the link). Also, this data is cars sold in the UK. Considering there are no Chevrolet (except Corvette) cars sold in the UK since 2015, and the only Chevrolets sold prior to that were the compact cars like the Cruze, I would say yes, these results are really meaningless as they apply to the US market.
Safety Car
Joined: Jan 2021
Posts: 3,658
Likes: 1,939
Drifting
Joined: Apr 2014
Posts: 1,458
Likes: 625
From: Southeast, FL.
Safety Car
Joined: Jan 2021
Posts: 3,658
Likes: 1,939
Racer
Joined: Mar 2021
Posts: 289
Likes: 200
It would most likely be a QA/QC process correction as opposed to a full on redesign. Sad to say for those already produced, they'll probably get a coating ("sealer") treatment to plug the porosity.
Race Director
Joined: Aug 2016
Posts: 12,710
Likes: 10,140
From: Garden Valley CA
It depends on the location(s) of the porosity causing the problem. The pictures I saw looked like porosity due to suck-back during casting cooling. If all the problems are in the same location than that can be addressed to a local modification of the casting. If they are in random locations then it is a different story.
8th Gear
Joined: Jun 2021
Posts: 8
Likes: 7
From: Las Vegas
New to Forum...
2020 C8, currently has 3000 miles on it and in the shop. Found 2 puddles under the rear wheels, one was about an ounce of fluid, very dirty. Second puddle was about 6 ounces and clear, as if just poured out of the bottle. Taken in to the dealership this morning. Diagnosis is leaking transmission pan seal. This is the second time for this problem, first was at 1300 miles. Car is a daily driver. GM Tech is involved....so will see what happens. Current plan is to clean it up, reseal, drive till hot then let sit over night and evaluate in the morning. Will update as I find out more.
Dronepilot
2020 C8 LT2 with competition seats and front lift
2020 C8, currently has 3000 miles on it and in the shop. Found 2 puddles under the rear wheels, one was about an ounce of fluid, very dirty. Second puddle was about 6 ounces and clear, as if just poured out of the bottle. Taken in to the dealership this morning. Diagnosis is leaking transmission pan seal. This is the second time for this problem, first was at 1300 miles. Car is a daily driver. GM Tech is involved....so will see what happens. Current plan is to clean it up, reseal, drive till hot then let sit over night and evaluate in the morning. Will update as I find out more.
Dronepilot
2020 C8 LT2 with competition seats and front lift
Drifting
Joined: Jul 2003
Posts: 1,868
Likes: 294
From: West of Burlington, Ontario Canada
5th Gear
Joined: Jun 2021
Posts: 5
Likes: 1
From: Forest City, FL
C 8 Transmission failure at 2900miles
I took museum delivery of my 3LT C 8 on 2/7/2021 after waiting for 15 months. Shifting issues began with "Idle Creep Sensor Disengaged" warning, at 2900 miles, then rough shifts and finally, stuck in second gear. The dealer has diagnosed the problem as a transmission valve body failure. The factory tech team recommended part replacement. The part is expected in 8 days, then we will see what happens. Since no rental or loaner cars are available, GM has offered to reimburse up to $46.00/day for a rental. Currently, rental cars in Orlando are sunning $200.00/day 