21 at4 6.2 transmission toast

[Bob’s Sierra]

this truck has been a giant pos from day one 

 

bought new in january 21

 

in may of 21, lifters collapsed left me dead on the road

dealer fixed and replaced one bank of lifters

 

two weeks ago I was getting an awful clunk 

sound 

 

took to dealer and they attributed it to bad 87 octane and suspension clunk 

 

yesterday I was 200 miles from home with my two dogs in bfe

 

 

and they clunk rattle was terrible 

the service 4wd

the service engine 

low power mode came on 

 

 

limped to safe spot and called on star and they towed it to nearest dealer 

 

dealer thinks it’s the transmission 

 

2 catastrophic failures in first 14 months 

 

the truck now has 39,000 miles

 

needed to vent 

[Bob’s Sierra]

my truck has been at the dealer since last tuesday now 8 days

 

and they have no idea what’s wrong with it 

 

this is a dealer in tuscaloosa al

 

they said “it could be electronical”

but they don’t have a clue and they have no idea when they will no what the problem is 

[Bob’s Sierra]

my truck has been at the dealer since last tuesday now 8 days

 

and they have no idea what’s wrong with it 

 

this is a dealer in tuscaloosa al

 

they said “it could be electronical”

but they don’t have a clue and they have no idea when they will no what the problem is 

 

 

 

update 4/7

 

 

 

now dealer says it’s in fact the transmission 

 

and it maybe the planetary gear 

 

they are taking transmission out now to see what’s broke 

 

they will then see if gm wants to rebuild or replace the 10 speed

[Anon12345]

9 minutes ago, Bob’s Sierra said:

my truck has been at the dealer since last tuesday now 8 days

 

and they have no idea what’s wrong with it 

 

this is a dealer in tuscaloosa al

 

they said “it could be electronical”

but they don’t have a clue and they have no idea when they will no what the problem is 

 

 

 

update 4/7

 

 

 

now dealer says it’s in fact the transmission 

 

and it maybe the planetary gear 

 

they are taking transmission out now to see what’s broke 

 

they will then see if gm wants to rebuild or replace the 10 speed

Thats unfortunate.  Do you know what caused the tranny to fail?

[Bob’s Sierra]

nothing to cause it 

 

I just drive it 

 

I drive about 3,000 miles a month 

 

i’ve had a 2015,2018, and 2020

 

this 21 has been a pos

[Bob’s Sierra]

they are going to do a cost analysis on whether to rebuild or replace entirely 

[Z45]

Friend was telling he and wife went from MI to FL for bike week with a friend in his 2021 Trail Boss 6.2L towing a few bikes.  Got to SC, water pump failed. Got close to Daytona, motor started make noise (not lifers).  10,000 miles.  Dealer cannot source a new engine so they had to leave truck down there and its still there.  Dealer said, engine will have to come from assembly plant warehouse and may take looooong time.  

Edited April 7, 2022 by elcamino

[Bob’s Sierra]

my lifters went out at 9,000 miles

they replaced one bank

[Bob’s Sierra]

almost every 

4 hours ago, elcamino said:

Friend was telling he and wife went from MI to FL for bike week with a friend in his 2021 Trail Boss 6.2L towing a few bikes.  Got to SC, water pump failed. Got close to Daytona, motor started make noise (not lifers).  10,000 miles.  Dealer cannot source a new engine so they had to leave truck down there and its still there.  Dealer said, engine will have to come from assembly plant warehouse and may take looooong time.  

 

I can only imagine, almost every new 2022 i’ve seen in half ton has the the 3L diesel 

 

That 6.2 new engine will be a while getting to Fl

[Carlos Trevino]

On 4/7/2022 at 8:32 PM, Bob’s Sierra said:

my lifters went out at 9,000 miles

they replaced one bank

My 2020 Colorado with 17,000 miles on it had a loose lifter and its being serviced for the second time, the first time they did some things that didn't fix a thing. Also my transmission is running rough and I'm familiar with GM transmissions and that its a problem GM is in denial about, the dealer says there is nothing wrong? I will take it back till they fix it or get ahold of GM

[Anon12345]

10 hours ago, Carlos Trevino said:

My 2020 Colorado with 17,000 miles on it had a loose lifter and its being serviced for the second time, the first time they did some things that didn't fix a thing. Also my transmission is running rough and I'm familiar with GM transmissions and that its a problem GM is in denial about, the dealer says there is nothing wrong? I will take it back till they fix it or get ahold of GM

What engine do you have in your colorado?

[Bob’s Sierra]

to stay on topic the dealer has had the at4 6.2 for 15 days 

 

nothing firm on what they plan to do to fix the 10 speed transmission 

[Oscar Cabrera]

sorry man - was at least your lifter issue fixed once you had that done? I guess you only put 1k miles since repair. 

[Bob’s Sierra]

i’ve put over 25,000 on it since the lifter issue 

 

now the transmission is done , and it has sat at dealer for 3 weeks and no one has  touched it since 

[Big_Kahuna]

1 hour ago, Bob’s Sierra said:

i’ve put over 25,000 on it since the lifter issue 

 

now the transmission is done , and it has sat at dealer for 3 weeks and no one has  touched it since 

wow this is crazy , I have see way to many engine failure from GM , and I though the hemi 5.7 had a bad lifter design .....