calaher

Car is just a bit over 44K miles. Driving home last night and Check Engine Light comes on and stays on. Pulled over and stopped (kept engine running) and read manual - said something about possible emission control problem and to have it checked soon. Also checked gas cap and reseated because I did just fill up about 20 minutes prior. No other warning lights or sounds. Put car in gear to head home and seemed like it was sluggish, like it was starting on 2nd or 3rd gear. Then quickly noticed that it was stuck on the one gear and wasn't shifting at all. At 40 mph, was running at ~2,000 rpm. Got off the highway and took back roads, keeping rpm down below 3,000. Car had been trouble-free and serviced on schedule. Last service was 2 months ago to correct the rear end clunk and dealer did the differential fluid TSB. He said no codes came up so not likely a tranny problem.

Any ideas on the cause? Is there anything in the DIC that I can check? Do I have a hosed tranny? BTW, I have GMPP Major Guard and will take to dealer this comming week but wanted to see if I can get educated first. Thanks in advance for the help...

chgoblue

I had a different problem with the tranny gear shifter, but I feel your pain.

I had 13k on the 07 A6 Z51, and had a bit of trouble pulling it out of park at a light. Got home, and went to put it in Park, and it wouldn't go past neutral, not reverse, either.

Turned out to be a broken shift cable, and some kind of bent lever, replaced whole model for $600, covered under extended GMPP. Got to love the piece of mind the ext warr gives.

Your problem is obviously in your tranny, not your shifter, but don't be surprised if you do if you have the car for awhile.

Battery voltage got a litte low b4 I could disconnect the cable (because radio light wouldn't shut off w/o it in park (!), left it for 2 hours b4 I could get to it. Car wouldn't take a jump from me, tow truck driver, or dealer. 9 mo. old battery, and dealer had to recharge it to get it into the bay, been fine ever since.

calaher

Had a shifter problem last year. It would go in either D or S OK but only way to go into R was to go to P first and then down to R. A real nuisance when parking. Also, it could be easily be "bumped" from D to S. Dealer had to do something with the shifter cable. Yes, thank goodness for GMPP!

saintsfan1

Is there a TSB on the rear end clunk? I took mine to the dealer for this problem and was told this is normal.

chgoblue

I don't have it, again, in my 07 A6 Z51...maybe they didn't put it in the LMB

That is frustrating since it's one of those slightly beneath the surface problems that a dealer can say, "Oh, that's normal". It sounds like because they aren't sure of what is normal, or how to fix it, so that's the easiest thing to say. They get paid either way (warr or not), but they won't take the job if they don't think they can figure it out.

I don't know, maybe describe the clunk, when it does it, how loud, etc, and do a poll for your year, model, suspension package, etc. And, point out that you want feedback from people who DON'T HAVE A CLUNK, since that's the whole point of the survey.

Just an idea. Maybe take it to any independent shop you trust, or one of your buddies knows, give em $20 just to have them take a ride around the block.

Or, better yet, go to a local informal Vette gathering, and see what the other Vettsters have to say.

Oh, yea, and here's to Dennis Fitchner and the GMPP

carpe dm

The only thing "normal" about it is that it is normal for them to tell you that!!

AORoads

hmm, goes from perfect running to CEL after filling tank? sounds fishy to me, like maybe a gas issue, potentially. any issues before with trans at all? tell us what dealer finds.

chgoblue

Sorry, I forgot to say maybe 'run a poll' asking if anyone has had a clunk or no clunk, "describe the clunk, when it does it, how loud, etc, and do a poll for your year, model, suspension package, etc. And, point out that you want feedback from people who DON'T HAVE A CLUNK, since that's the whole point of the survey."

calaher

http://forums.corvetteforum.com/1570150095-post8.html

mus99gt

I have an 06 with automatic. My car has done this 2 times in 2 1/2 years. It did the other day. I cleared the codes and no more issues. The first time I took it to the dealership and they did the same. Could not find any errors in the TCM.

bladesilvervette

there is a TSB on the 6 speed auto tranny's pulling a pin loose on the tranny 21 pin conector. the tranny will default to 2nd gear you and pull it down to first. but there also is a traction control message and abs message at the same time. The problem being is that the harness is pulled short and the black with red wire will be pulled " you will have to look hard to see this" but will be very intermitent . I have seen this a few times . This wire will cause loss of comm at the bcm, tcm , and abs. Let me know if this helps

calaher

Thanks for all the replies. Will post after I take to dealer and (hopefully) resolved...

calaher

UPDATE: Got it back from dealer today. Codes were P0700 and P1825. Transmission range switch intermittent open circuit. Replaced shift valve range switch. Found no burning smell in transmission oil. Told them to go ahead and replace fluids anyway. Seemed OK on drive home. Will keep an eye on it until I regain confidence that all is well again...

RicK T

There have been quite a few threads on this. No repeats after repair as far as I remember. Glad your dealer got straightened out for you quickly.

In case you're interested in an explanation here's one from Talon90:

calaher

Thanks. Looks like I need to learn how to do more effective searches 'cause I looked hard for something like what Talon90.

AORoads

good to hear the results and fix.

Easy Rhino

Good to hear the okay news - problem minor and solved.

Absent the clunk (I know - unrelated), I have heard little in the way of tranny failures, if you discount the dudes running 600+ HP through the A6.

I'm hoping that the tranny (yeah, I know - "hope" is not a "plan") in these does not turn out to be problematic as this is not a simple drop it operation to rebuild it. Still better than my buddies' Porsche Boxter sitting in his garage with a dead manual tranny.

LS WON

This is why I'm glad I got the old tried and true 4 spd auto 465LE on the 2005 model.