2009 Silverado 6 Speed Trans Issue
 

Anyone else having issues with 2009 6-speed trans?

Bought my truck new. 2009 Silverado 1500 crew cab 5.3 with the new 6 speed auto transmission.

Since day one it lurches into 2nd gear when coasting.
For example, when I am driving through my neighborhood each morning I cruise slowly and at approx 15-20 mies per hour if I am not accelerating(just coasting on level ground or small hill)it will loudly clunk itself into the next gear. Always just the one same gear (2nd i believe)

First time I brought it to the dealer they said they could not reproduce it. Kinda crazy as it does it all day when im driving.
Second time they reproduced it but said "as engineered" Total BS but from what I understand they can't do anything until it's reported in much larger numbers?

Also, the air conditioning works fine but at high fan speeds it rattles loudly in the vents.
Again the dealer reproduced the issue asap but said "as engineered"

I'm just hoping to get a little feedback here and wondering who else may be having these issues?

Ty

Dam man sorry to hear that! Maybe someone else will have something similar to what you are experiencing.

my friend has a 08 with the v-max and the 6spd and he has gone threw 3 transmissions in that thing (under warranty of course) but he thinks its a ****ing race car and and likes to shift it him self... those new 6spd make me kinda hessitant on the new silverados... im hoping that they are just as reliable as the 4spds that have been used in the past years as i have a 02 with 160k on it and im still on the original trans and i tow sometimes usually my car or friends cars and a boat ocassionaly. good luck just hope that it goes out while under warranty.

Brakes 101,
I apologize you have been having a concern with your vehicle. Have you taken it to a different dealership for a second opinion? I would like to have one of our agents look into your concern further. Please e-mail me your VIN, current mileage, dealership, contact information, and best time to contact you. You can reach me at socialmedia@gm.com. Please address the e-mail to Christina.

Christina
GM Customer Service

I've had a similar experience with mine on the clunk when shifting at low speeds. It did it fairly often when brand new but I have not noticed it lately. The fan noise has not been a problem with mine. It looks like you may have the attention of someone who can help. Good luck.

Hey,
I'm glad you posted this. I have a 2010 Crew cab with the six speed tranny having the same problem. Just feels like it sputters sometimes, and then when I and slowing down for a light, it feels like it lunges forward too. Took it back to dealer, and they took it for a ride, and told me it was a normal shift? I traded in an 06 ext cab with the same 6.0, and never had this problem. I will be taking it back up now. Thanks.
I have even switched to 93 octane gas from mid grade with no change.

SlimJim, Grimreaper105,
I apologize you are also experiencing a problem. If you haven’t taken your vehicle to a dealer I would recommend doing so to have the problem diagnosed and documented. You can reach me directly at socialmedia@gm.com. Please address the e-mail to Christina. Please keep me updated on your progress.

Christina
GM Customer Service

2009 gmc 6 speed issue
 

Thanks I am glad to see you posted this
I have a 2009 GMC with a 6.2 litre matched with 6 speed tranny. I have taken this truck many times to the dealership with a tranny that makes all kinds of wierd noises. This truck is 17 months old I have 159000 km, and when it shifts with any weight or torque to it makes an awful noise like a clutch slipping or the sound of brakes when they are way to hot this only happens when it is shifting from 1st to 2nd gear now some times it will just shift hard or when you are slowing down it will jump a gear. The dealership says that they have reprogrammed it they cleaned the mass air flow sensor (not sure how this affects tranny?) and they say that they can not make this happen when they take it for drive. So i am not sure what to think of this tranny warranty is up in 1000km i am going to take it one more time to hear the same story and when warranty is up it will have to be replaced at my cost funny how it all works any ones advice would be great i searched all over the internet thanks

my son has a 09 with the energy managment system and 6 speed. he is always complaining about the trans, it never knows what gear to go to or upshifts too early.

its a company truck and he knows he will be getting another one in a while so he has only had it back one time, i think dealer said that's the way it works.

maybe the truck does not know what gear to go to or how many cylinders are firing.

very complex system for country boys who just want it to start run and shift smoothly.

2009 Trans problem
 

I hate to hear about the learching issues in 2nd gear. I have the exact same truck, but I've had no issues at all. sounds like there's a problem for sure. Next time you take it to the dealer, make the service manager get in the truck with you and see if he still says it operates as advertised.

Same 6 speed trans problems
 

I also have a 2009 5.3L Silverado Crew Cab w/11k miles on it and I'm experiencing really rough shifting from gears 1-2 and downshifting 2-1. It was very noticable in stop and go traffic around 10-15 mph. I also hear a clunking sound around the 2-3 upshift. Sometimes when I'm coming to a stop, it feels as if someone ran into the back of the truck and it lunges forward. Actually, just the other day I was making a left turn (@10-15mph??) and as the trans downshifted, you could feel the truck lunge forward during the turn. Other times the transmission seems altogether lost, or hunting for the correct gear. Just merging with traffic can be challenging with this transmission....it seems as if it won't downshift at all when you need it to and you have to punch the accelerator just to force any type of downshift at all. This is my first Chevy truck and what a disappointment it's been so far. I've been apprehensive about taking this to the dealer...only because I'm expecting to hear the line " it's normal operation". If it's gonna die, I hope it dies within the 5yr/100K warranty.

Just a thought, try cleaning the Mass Air Sensor with the cleaner from a parts store. If they get dirty then the transmission will shift weird.

My 08 1500 4 spd OD (not the same tranny obviously) has the exact same issues you guys are talking about. It will hold first too long at relatively low RPM then pound into second, and once in a while it will short shift second and right on into third. It also gets confused alot like it doesn't really know what gear it should be in. I'm thinking that our issues with different GM tranny's with similar problems may have something to do with a common sender or control module, maybe even computer related. OR maybe I'm out to lunch and this is all 'as engineered'..

Thomas78,
How long have you been experiencing this concern? If you would like to talk about your concerns further, please e-mail me at socialmedia@gm.com. Please address the e-mail attention Christina. Thank you.
Christina
GM Customer Service

Trans Problems 2010 Silverado 1500
 

You are not alone. I waited 6yrs after my 2004 silverado to try again with a 2010. I loved my new silverado the first 10,000 miles. Now at 10,400 miles the tranny wants to upshift way to fast, downshift way to slow and when turning into parking spots it wants to lurch foward. Gonna call my dealership and ask about this, but I remember with my 2004 the answer was always"characteristics of the vehicle". I really hoped that this truck was gonna be different.

That really sounds like a faulty Throttle Position Sensor.

Thanks, I actually mentioned to the dealer when I set up the appt that it could be something in the fuel management system

I was having the same issues as well as other issues with my '10 Chevy 5.3 6-speed. The truck hits second hard but also won't up-shift sometimes when cresting a hill and will continue to rev at 3000-4000 rpm without my foot even on the throttle. The first dealership I went to said that the problem could not be duplicated so went to a second dealership. The second dealership had me drive the truck while a technician rode along with the scanner. The truck didn't act up at all the whole time the scanner was plugged into the truck and the technician thought I was crazy. I had him unplug the scanner and sure enough the truck immediately started driving like ****. The truck wouldn't upshift when cresting a hill without my foot even on the throttle. The truck also wouldn't downshift until my foot was almost on the floor, eventually it will drop 2 or 3 gears and scream to get up to speed.

The dealership has since replaced the ECU in the truck as well as cleaning every ground connection. When neither of those things helped out they took my truck for 2 weeks where they took apart the transmission and replaced various valves and other parts. The truck is still having issues and don't even dream of trying to haul a trailer. This truck has the VVT and cylinder deactivation, yet I get approx 15 mpg on average. I had the exact same truck but it was a 2007 with the 4-speed which gave me at least 20 mpg most days. I'm a big fan of Chevy/GMC but this truck was meant for the junkyard since day 1.

09 Chevy Truck Shifting Issues
 

I'm own a 09 Chevy Silverado crew cab 1500 with a 5.3 and 6-speed transmission. Im glad to see other truck owners are experiencing the same shifting problems. I bought my 09 Chevy Truck used back in October 2011, I didnt notice anything unusual with the shifting. The only thing I upgraded was the exhaust which I installed shortly after I bought it. I started to notice the unusual shifting problems when I engaged/disengaged the towing fuction. Even sence I notice when I'm cruising in traffic around 15-20 mph, I really need to give it a lot thottle to get it to go, feals like its bogging. It did down shift eventullay but the truck lunges.
The fuel miledge is around 14-15 which I thought it should be a lot higher.
I took the truck to the dealer and spoke with the service manger. He plugged in th GM scanner and took it for a test drive. When he came back he said there where no problems with the engien or transmission. He went on his comuter and downloaded a sevice bulletin. (Doucment ID 2716749) Clearly states what I'm experiencing. The tranmisson is programmed with what they call a "Shift Stabilization" Here is what paragraph states:
"Some customers may comment that the upshifts are delayed or not available when in fact the transmission is operating normally with a feature known as "shift stablilization." This may contribute to "cannot duplicate/no trouble found." It is Important that the customer be educated about this feature if this occurs"........
I have a eletctonic copy of the service bulletin so if anyone wants it just email me (jmann24@charter.net)
I really want to take this to a different Chevy dealership and see what they say. This cant be normal!!!!! Truck is hard to drive at low speeds.

I feal your pain on getting the run-a-round............
Jim

There is a factory bulletin about a hard shift from 2nd to 1st as well as from 3rd to 2nd, it is not a recall but if you still have drive train warranty they will fix it.

Would you send me the document about the shifting problem. Thanks

I have a 09 Sierra with transmission issues as well, for the first 4 years not a sound out of the transmission. As it got into the 5th year it started a nasty clunk when shifting from 3rd to 2nd and 2nd to 1st, always at 40k & 20k. The GM dealership at first claimed it was a normal thing, I would not buy any truck new that has transmission noise, they then took it apart and replaced many parts and added a part that the factory frogot? It still makes the same noise, and to top it off the noise is worse in the summer when its hot, you would think with the metal being hot the clearances would be tighter? In the winter it's not as bad, I am running the factory synthetic oil, this is the only sound the 6 speed makes.