GMC ****** issue

3,573 Views | 33 Replies | Last: 6 yr ago by BigPuma
highvelocity
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AG
14 GMC Sierra - 49k miles

Got my AC replaced two weeks ago and right after I felt a hard knock from 2nd to 1st gear kinda how a manual transmission will engine break when you're slowing down. My check engine light is on and the auto start doesn't work.

It stopped for about a week but the issue came back today. Any help would be appreciated. I'm in Houston so if someone has a recommendation on a transmission service I'd appreciate that to

Edit - apparently I can't type tr@nny in the title
Owner of Texas Strap Company use code TEXAGS for 15% off
www.txstrapco.com

Sales Director for BCA Firearms
www.bcafirearmstx.com
meggy09
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Idk what you mean by a hard knock when down shifting a manual, but a pretty basic first step would be going by almost any auto parts store to get your code read. Could be anything. Also a SES light on for any reason will disable the remote start feature.
Corps_Ag12
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Agree with above.

Also, my '13 transmission clunked/engine braked when it downshifted from mile 1 to mile 120,000, which is when I traded it in.
highvelocity
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I'm debating getting a ferd at the end of the year. The whole getting my ac replaced really pissed me off
Owner of Texas Strap Company use code TEXAGS for 15% off
www.txstrapco.com

Sales Director for BCA Firearms
www.bcafirearmstx.com
Mr. Dubi
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What did the shop screw up?
Corps_Ag12
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What was the root issue with the A/C?

I'll be honest, i've never had any major mechanical issues with any of my GM trucks (that i did not cause myself). My 2013 had paint issues, but those exposed themselves while still under warranty (twice) so after a pointed battle with the dealership they finally made it right. I still shop at that dealership to this day.
highvelocity
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Full replacement. I had a die test ran and had the freon charged and a week after that the ac cut off again. Took it back in and the die test showed leaks in 3 different locations.
Owner of Texas Strap Company use code TEXAGS for 15% off
www.txstrapco.com

Sales Director for BCA Firearms
www.bcafirearmstx.com
BigPuma
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Is the traction control or abs lights on as well? Do you hear any misses in the motor?
highvelocity
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No and no. When accelerating the shift from 1st to 2nd is slow. And coming back down it's rough. All other gears aren't having this problem
Owner of Texas Strap Company use code TEXAGS for 15% off
www.txstrapco.com

Sales Director for BCA Firearms
www.bcafirearmstx.com
txyaloo
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Why don't you go get the codes pulled?
highvelocity
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i'm doing that this afternoon.. was just trying to get some insight before hand.
Owner of Texas Strap Company use code TEXAGS for 15% off
www.txstrapco.com

Sales Director for BCA Firearms
www.bcafirearmstx.com
meggy09
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Also shouldn't this still be under powertrain warranty? Just take it to a dealer.
BigPuma
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It is definitely under the power train warranty.

Is it idling rough? I bet this is a motor issue.
highvelocity
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no rough idle. just when shifting
Owner of Texas Strap Company use code TEXAGS for 15% off
www.txstrapco.com

Sales Director for BCA Firearms
www.bcafirearmstx.com
highvelocity
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AG
fuel injector and crossover pipe
Owner of Texas Strap Company use code TEXAGS for 15% off
www.txstrapco.com

Sales Director for BCA Firearms
www.bcafirearmstx.com
BigPuma
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AG
covered right?
highvelocity
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i was told no..
Owner of Texas Strap Company use code TEXAGS for 15% off
www.txstrapco.com

Sales Director for BCA Firearms
www.bcafirearmstx.com
Silvy
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I'm ordering a whole new set of Delphi injectors for $52 shipped. What crossover pipe, fuel rail?

W/ big smile
cledus6150
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Ouch, I guess I will keep my fingers crossed that my '14 GMC continues to keep on being reliable. She has 65k on her now and have had no issues as of yet...knock on wood.
highvelocity
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yes.. knock on all the wood lol. i was told earlier today from the lady i bought the truck from i have an extended warranty (which i knew i did, but the fella at the current dealer said i didnt) so if it gets covered, i'll get back to you about tonight
cledus6150
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Sounds good to me man, hope it works out for ya and that it is covered.
zap
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Just dropped my 2014 Sierra off for warranty service. There is a noticeable chunk while slowing down. Clunks from 3rd and 2nd and from 2nd to 1st.
highvelocity
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let me know how / what is the problem
BigPuma
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mine waited another 5k before lifters failed on the left bank. If your **** lights up like a scoreboard and then idles rough just take it to Beck. Don't bother with Westpoint. My lifters failed 2x within a two and half month period and less than 5k miles. This caused a cylinder 7 misfire/failure. Covered under warranty so I got it fixed but then drove it until i was able to convince the rib to let me get something else.

I had all regular maintenance completed at recommended intervals.
Corps_Ag12
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Damn, they are failing even sooner than the GMT900 was.....
BigPuma
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stupid DoD crap. 71 and 75.5k miles. traded it with 77k on it.
highvelocity
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does anyone know a quick fix for a lock? i had my truck broken into in january (similar to how fords are broken into) and its all kinds of janky
cledus6150
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Dang, I hope that doesn't happen to mine. Im sitting at 65K right now, all seems to be fine, luckily all maintenance has been done by beck as I take advantage of that free oil change they offer for lifetime of my ownership .
Silvy
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Have the AFM turned off.
Corps_Ag12
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BigPuma said:

stupid DoD crap. 71 and 75.5k miles. traded it with 77k on it.


My '13 made it to 120k and I decided I was on borrowed time so I traded it in & bought a Duramax.
highvelocity
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i think this will be my play at the end of the year
BigPuma
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i got a 2016 two fiddy lariat w/ the powerjoke
cledus6150
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Yeah when I get the exhaust and tune from kp racing they do that.
zap
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Just got word that one of my injectors is bad with over 1000 misfires on the ECM. After they fix that issue, they will troubleshoot the transmission. Still under warranty, but I don't like this at all.
BigPuma
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lol on only 1k misfires

but seriously the way my truck was idling / driving rough the motor was causing the transmission issues.
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