Last post on Jun 13, 2013 at 11:54 AM
You are in the Chevrolet Silverado & GMC Sierra
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Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Transmission, Truck
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#1279 of 1499 6 speed GMC transmission problems
Jul 19, 2012 (2:01 am)
Keep trying, I complained so much, sent a certified letter to the ceo of GMC, finally the district manager called and offered to buy me out of my 2011 and into a 2012. I am still waiting for the dealer to locate an identical truck but hope to get results soon. The truck is dangerous, it actually accelerates as I'm slowing down and it is always in the wrong gear constantly up and down shifting and bogging because it won't accelerate when necessary! Keep screaming or we will need a class action law suit!
#1280 of 1499 7th time to the dealer?
Jul 19, 2012 (8:49 am)
I have posted on this before. My truck is at the shop again. I am pushing them to look into the TPS this time. I continue to have downshift/re-acceleration issues with my 2009 GMC Sierra 5.3l 6-speed 3.42 rear end. Very, very, very frustrated. I have an open case number and talk with GM reps...they are very professional, but absolutely no help. The dealer is great...the problem is GM engineers...they need to come up with a fix for this known problem and known issue. I pay a ton of money for this truck and it is the nicest vehicle I have ever owned (bought in '10 with 12K on it). I now have 69K on it.
there are no codes...which renders the local dealer mostly helpless as they try to fix the crappy programming of the TPS, TMS, and Transmission. The loaner vehicle I have this time is a 2012 Colorado with the 5.3l in it and a 4speed. Oh, how I miss the 4 speed. This little truck rocks...seems so much "less confused" than my Sierra.
I drove a 3.5l EcoBoost the other day...WOW. Ford has that thing dialed. Makes it pretty hard to want to stay in this GM product. Don't get me wrong...I really, really like my truck. Like how it looks, interior, power, fuel economy...but when I have been driving a vehicle for 30K+ miles and continue to bring it in to the dealer to fix a very, very serious drive ability issue and they are left stranded by GM who, with all their R&D and techy know how can't seem to program the thing to run correctly...well, quite frankly, it sucks rocks.
Should be getting a call today from the dealer. Will let you know if whatever they "fix" this time changes anything.
#1281 of 1499 Re: Seems normal [gmcustsvcsarah]
Jul 19, 2012 (2:47 pm)
Thank you for your reply! I actually figured this would just get lost in cyberspace. I will email with info. I also still have the same problems only progressively getting worse. I am planning yet another trip to Dominion Chevrolet Richmond, Va. very soon to look at these problems. 13,000 miles and I want documentation before my warrent expires or runs out.
#1282 of 1499 Re: 1996 gmc sierra - no overdrive/drop down [earlybird6754]
Jul 22, 2012 (6:45 pm)
Definitely sounding like a solenoid issue. If you've never replaced that on your stock transmission, I'd suggest getting on line to GM Parts Giant, GM Parts Direct... one of those should have your solenoid.
The R&R will be tough if you don't have a trusted transmission person that will do the service without telling you "you need to check this". A tale-tell sign is if the transmission fluid is it's pretty ruby-red, and there's no sediment, get the solenoid changed. The R&R shouldn't be more than $100 if you have the part. Call the stealership and get the part number, and roll from there. If the fluid is in good shape you should be able to re-use it.
Let me know how you make out.
#1283 of 1499 Re: 6 speed GMC transmission problems [alcianfarini]
Jul 22, 2012 (6:53 pm)
If they're going to give you a "deal" on a new buy, ask for the LT package. It has a little better transmission, and if you're in the need to tow something, all the goodies will be there.
#1284 of 1499 Re: transmission issue [lisa117]
Jul 25, 2012 (7:11 pm)
I also have a 2012 6 speed that is not running correctly. Especially going down a hill or mountain. The trans just goes into free wheel mode and here you go. Pulling a trailer going down hill is always my favorite idea of fun.
I have called GM and setup a case on it and they are playing the normal games of nothing wrong with it. Like you said if it was there dollar I bet it would be fixxed or taken back.
#1285 of 1499 Re: transmission issue [aggrivated1]
Jul 26, 2012 (1:56 am)
I finally got my truck back 2 weeks ago. So far its running as it should have when it was purchased. Dealer found pump and converter full of metal on the rebuilt transmission. GM finally authorized a transmission replacement on my not so new 2012 silverado lt 5.3 6 speed 4x4 z71. Now im hoping it will last longer then the last one (2k miles). Im not holding my breath and I contacted a lawyer.
Jul 26, 2012 (5:39 am)
Has any one here in the forum thought about or tried to put true duals exhaust on a 6.0L to see if it helped in the performance and fuel mileage. I cannot believe that with all the technologies we have and a 2012 GMC 6.0L 6 speed transmission will only get 14MPG. Thats on a good day along with the no power issue. I am waiting to see what GM is going to do.
As far as I am concern they can buy it back.
#1287 of 1499 Transmission issues
Jul 26, 2012 (1:20 pm)
I have a 2012 1500 with the 6.2 and the 6 speed transmission and have had nothing but problems since I picked up the truck.
I feel that not only are the issues aggravating but also quite dangerous. I have found that I can not change lanes and expect the truck to accelerate without a HUGE amount of lag time.
#1288 of 1499 Re: Transmission issues [aggrivated1]
Jul 29, 2012 (6:26 am)
What did you do about the Cat converters?