C6 Corvette General Discussion General C6 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by: Feral Industries

08 automatic shift problems

Thread Tools
 
Search this Thread
 
Old Dec 17, 2007 | 09:27 AM
  #1  
alikazan's Avatar
alikazan
Thread Starter
Cruising
 
Joined: Jun 2006
Posts: 14
Likes: 0
From: sicklerville nj
Default 08 automatic shift problems

my 2008 with only 1000 miles is not shifting properly. When i put the car in Drive it is takes about 10 seconds to engage. also i feel that the engine is working to hard and the car is not picking up like it used to. I droped it off for service this morning and i am crossing my fingers and hoping not to hear the words " nothing is wrong with it" coming out of the service managers mouth. Anyone experienced a similar issue before?
Reply
Old Dec 17, 2007 | 10:03 AM
  #2  
Atomic-Vette's Avatar
Atomic-Vette
Drifting
10 Year Member
 
Joined: Nov 2005
Posts: 1,629
Likes: 3
From: Edmond OK
Default

so they still haven't fixed that problem huh?

Look up A6 shifting problems, this is a fairly common issue with the 07's as well. Mine started doing that after about 1000 miles too. Basically you're loosing 1st gear.

here's a couple links.

http://forums.corvetteforum.com/show...light=shifting

http://forums.corvetteforum.com/show...light=shifting

http://forums.corvetteforum.com/show...light=shifting

Last edited by Atomic-Vette; Dec 17, 2007 at 10:06 AM.
Reply
Old Dec 17, 2007 | 11:37 AM
  #3  
alikazan's Avatar
alikazan
Thread Starter
Cruising
 
Joined: Jun 2006
Posts: 14
Likes: 0
From: sicklerville nj
Default

i had an 06 and a 07 that never had this issue. after reading the attched threads i think my car will be in the shop for a while. once fixed do these problems continue to occur?
Reply
Old Dec 17, 2007 | 01:36 PM
  #4  
thesubfloor's Avatar
thesubfloor
Melting Slicks
15 Year Member
 
Joined: Jul 2007
Posts: 3,097
Likes: 5
From: Brentwood World's first A6 in the 9's (including N/A, blower, turbo and nitrous cars) 9.950@139.267 CA
Default

I just discovered something this past weekend that might be of interest to you.

I took the car into the dealership last week as I was having a TCM problem where it was erroneously setting a trouble code and putting the car into limp mode. The dealership reprogrammed the TCM and although it did fix the problem with the trouble code, the car started feeling like it was losing power every time it shifted (the car's an automatic).

At first I thought it might have been due to the adaptive learning of the transmission being reset while at the dealership but after three or four days of aggressive driving (in hopes of relearning the TCM) it didn't help any.

I hooked up the scanner on Saturday night and discovered that my spark advance was dropping up to 30 degrees between each and every upshift. I did some more research and found out that TM had been enabled in the car, hence the feeling like I was losing power.

I know that TM has always been present in the A6 transmission but I'm pretty sure that having it enabled during an upshift is new because my car never did this before I took it in last week. Fortunately for me I own an HP Tuner so I was able to disable the upshift TM but I wonder what would have happened if I didn't own one.

As such, if you get your car back and it suddenly starts feeling funny while shifting, that'll most likely be the reason why.
Reply
Old Dec 17, 2007 | 01:46 PM
  #5  
RicK T's Avatar
RicK T
Team Owner
10 Year Member
 
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Default

Originally Posted by thesubfloor
I just discovered something this past weekend that might be of interest to you.

I took the car into the dealership last week as I was having a TCM problem where it was erroneously setting a trouble code and putting the car into limp mode. The dealership reprogrammed the TCM and although it did fix the problem with the trouble code, the car started feeling like it was losing power every time it shifted (the car's an automatic).

At first I thought it might have been due to the adaptive learning of the transmission being reset while at the dealership but after three or four days of aggressive driving (in hopes of relearning the TCM) it didn't help any.

I hooked up the scanner on Saturday night and discovered that my spark advance was dropping up to 30 degrees between each and every upshift. I did some more research and found out that TM had been enabled in the car, hence the feeling like I was losing power.

I know that TM has always been present in the A6 transmission but I'm pretty sure that having it enabled during an upshift is new because my car never did this before I took it in last week. Fortunately for me I own an HP Tuner so I was able to disable the upshift TM but I wonder what would have happened if I didn't own one.

As such, if you get your car back and it suddenly starts feeling funny while shifting, that'll most likely be the reason why.
I wonder if that is a product of the "latest" factory software upgrade? Someone else mentioned last week that they had gotten the latest software at the dealer. I asked for details but never got a response. And Chuck at CoW even mentions the "latest" factory software with his tunes. Sounds like maybe someone with insight needs to enlighten us.
Reply
Old Dec 17, 2007 | 02:10 PM
  #6  
thesubfloor's Avatar
thesubfloor
Melting Slicks
15 Year Member
 
Joined: Jul 2007
Posts: 3,097
Likes: 5
From: Brentwood World's first A6 in the 9's (including N/A, blower, turbo and nitrous cars) 9.950@139.267 CA
Default

All I know is that if I had test driven the car before buying it and it drove like it did when I got it back from the dealer last week, I never would have bought it in the first place. Oddly enough, I noticed that it's even more of a power drop if you just barely put your foot on the gas pedal.

I went back and checked several earlier scans I did on the car when I was first tuning it and saw absolutely no evidence of any TM during upshifts so it has to be a recent TCM programming change. I'm really surprised that more people aren't complaining about it.

I forgot to mention that there were a couple of other additions regarding this as well. There's also a TM setting for CT (closed throttle) downshift as well as a "Garage shift" (whatever that is). There's a fourth one too but I don't have the software installed on this PC so I can't remember exactly what the last one is.
Reply

Get notified of new replies

To 08 automatic shift problems





All times are GMT -4. The time now is 02:20 AM.

story-0
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-1
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-2
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-3
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-4
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-5
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-6
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-7
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-8
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-9
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE