4T40E, "Torque Converter Lockup Selenoid" Replacement [Archive] - GrandAmGT.com Forum

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Rba007
11-15-2004, 09:26 PM
Anyone have any experiences replacing this part? Im getting the "shudder" in top gear, under very light load. Based on previous research, its got to be my torque converter trying to lock up, but not quite making it. It did it last year, and eventually went away. This year its really buggin me though.

Seems to have started now that its gotten cold. Doesnt effect the car, untill the tranny has warmed up a good bit.

Any thoughts? Anyone have any clue, or access to the GM tech site, so they can provide some insight as to how long/expensive this would be to replace?

THANKS!
-Dave

AznGA
11-15-2004, 10:01 PM
I think we have same problems. Mine shifts fine during WOT, but when it's not during WOT, the car doesn't wanna shift. It just jerks with RPMS bounching up and down. It finally shifts when I give it more gas.

Rba007
11-15-2004, 10:18 PM
i dont think its really trying to shift, i dunno. Its just when im in top gear, accelerating slowly. Feels like my tires are incredibly out of alignment, but its definitely not anything like that.

Brken123
11-16-2004, 05:10 PM
OK try this one out....now mind you this is still pending with a dealership because they haven't fixed it yet....but anyway my car seems like it won't stay in overdrive. As in if you cruise steady at 60 mph and are steady on the gas....ie not causing the car to accelerate or decelerate....and your on a level surface.....it jumps or "gear hunts" between 4th gear and over-drive. The tach is usually around 1800 rpms in over-drive at this speed, and for no reason it jumps between 1800 and 2300 (4th gear).

It gets better.....once your on the highway crusing....regardless of speed....and set the cruise control....the little "cruise" light comes on over the tach....and the car drives for about 15 seconds....and for no reason the cruise kicks off....this usually happens as it does the "jump out of over-drive and back into 4th gear" thing I described above.

Now I took it to 3 different dealers for this.....first dealership said nothing was wrong with it....it's normal for it to do that. (Based on that, I haven't been there since)....next dealership told me my ignition coils were bad, my injectors and throttle body needed cleaning, and that i needed new spark plug wires. Now because I don't know much about these transmissions other then the fact that they are computer controlled, I put faith in what the dealer told me and paid the money. Got the car back, after they had the damn thing all day, and it still has the same problem....mind you it cost me 600 bucks so far. (Have extended warranty, but according to the mickey mouse company they are....this kind of stuff isn't covered.....ignition coils are, but the labor to put them in isn't???) Anyway be forwarned....if you have cost gaurd as an extended warranty, watch your wallet going to the dealer.

So I took it to yet another dealer, just to get another opinion. Still fighting with the second dealer to get them to fix it, since they basically threw parts at it trying to solve the problem....found this out after I talked to the "trans tech" at that dealer today....he claimed he couldn't get the car to duplicate the problem....to which i said well if you couldn't duplicate it, why in the hell did I pay 600 bucks for you to do whatever you did, when you knew damn right well it wasn't going to fix the problem? (Like i said there's a long story with this...and I'll let you know how it turns out) Anyway the guy at the 3rd dealership told me it could be a few things....he said it could be a torque converter problem, a brake switch problem (aparently our brake system is tied into the tranny...and when it starts to go it causes the tranny to do all kinds of neat things) or it could be the bands in the tranny itself. (Bands are what hold the car in certian gears. <---Basic explanation...it's actually alot more complicated then that, but don't feel like going into details)

Now after all was said and done, this third guy (who seemed to know what he was talking about) even went out of his way to find out if this kind of thing is covered under warranty...mind you this was the mechanic....not the service guy you deal with at the counter....and come to find out that to get this fixed shouldn't cost me a dime. So you can imagine how ****ed I am at the second dealership...

Finally our cars have what's called an "adaptive" tranny....meaning that the computer constantly changes the way it shifts, depending on how the car is driven. I figured ok....unhook the battery...reset the computer....(because from doing this in the past i've noticed it ran different right after I unhooked the battery)....so I did this....and after being ****ed that I had to reprogram my stations and my equalizer for the stereo system, I drove the car around. Shifting problem is still there even though it drives completely different now.....so I'm kinda confused as to what to think is going on with it....like I said i'm still dealing with the second dealer to get them to fix it and also give me back my money for parts that I didn't need in the first place......

All in all once I get this settled (goes back in the shop on Dec 2nd....that was the next "appointment" they had available") I'll let you know what they supposedly think it was, what they did, and weither or not it fixed the problem. Hope this helps everyone out and also gives them the ability to know when the dealer is bull****ting you......wish me luck as far as Dec 2nd goes....cause if it's not right after that, my lawyer and I are going back to the dealer....(yep already called him)...... :rage: :iconfused :banghead

Rba007
11-16-2004, 07:05 PM
Im assuming our transmissions are similar, being that they are gm FWD applications, just that mine is made for sissy engines and yours for slightly less sissy engines. Ive got my fingers crossed for ya man.

Brken123
11-17-2004, 05:53 PM
"i dont think its really trying to shift, i dunno. Its just when im in top gear, accelerating slowly. Feels like my tires are incredibly out of alignment, but its definitely not anything like that."

Hey bro is this similar to....ok let's see how to say this......like when you drive the car in the snow and have the ETS (traction system) on and try to spin the tires....ya know how the car literally shudders as the system takes over and cuts the power from the motor? Is it anything like that? My uncle is a mechanic....ie the one that told me about the brake switch problem and possibly the cause....but anyway tell me if that's close to what's going on, I'll run it by him for ya and see what he says. I wouldn't go and get it looked at based solely on my uncle's opinion, but it's some food for thought...ya know?

Rba007
11-17-2004, 07:27 PM
Thanks for the help! That is pretty much what it feels like, although not quite as noticeable. At one point last year it got bad enough that it shook change in my cupholders...

After having the fluid changed 3 times in about 2 months, the shake went away untill this fall, when the temperatures fell again. Wierd!

Brken123
11-18-2004, 07:59 AM
Honestly bro I can't even begin to guess....uncle said he'd have to drive the car to feel what it's doing. He also said they're are so many things involved with the tranny that it could be one of 50 things causing it. He also said try disconnecting the battery, and reconnecting it. After that, drive the car. If the shudder doesn't happen for the first day or so, but starts to come back over time, he said it could be a computer problem and to go and have the PCM checked out. Other then that like I said he said he'd have to drive the car. Sorry I can't tell ya more...wish I could be like, "ok yeah that is caused by this..." ya know? Unfortunately I'm not a mechanic, although I may look into becoming one.....

Brken123
12-02-2004, 05:53 PM
Well I know this thread is getting old, but just an update for those of you out there that have or are having this problem.....took it back to hell....oh I mean the dealership today....dropped it off at 8 am......didn't hear anything from them all day, so took a ride up there around 4 pm (considering they close at 5) to find out what the deal was. Tried calling them, but kept getting the service departments voicemail.....
Anyway I get there and find out that they couldn't get my car on the lift because aparently the car they had in there before mine had all sorts of problems and they couldn't get it back together....blah blah blah......but anyway after arguing with the service guy for about 15 min, I found out that the tech took it for a ride, and felt exactly what it is doing. He claims they have to drop the pan of the tranny to look for metal shavings or to see if something internal has gone bad.....didn't mention anything about the brake switch. Then he said if they don't find anything internally, they'll check the computer (since the tranny is computer controlled) and try to see if that is doing something that it's not supposed too. Now if you read my first post on this page, you'll know what i'm going through as far as how much this has cost me so far. So I told the guy.....before you do any work....this isn't going to cost me a dime, correct? He said well all your looking at so far is a $75 diagnostic charge.....to which i said....no...i'm not paying that. You people charged me all this money, and then on top of that it's still broke, I bring it in here today in good faith just to find out that it won't be worked on until tomorrow (which means now I have to go to my boss and try to manipulate my work schedule....so I can get out of work to be able to go there and pick it up before 5 pm....if they fix it) and now you want to try to charge me for this? He's like .... we'll let us find out what's going on first, and then we'll see what's going on with your warranty and then the price and all that......i said no....the only thing you'll see is a work order with a zero balance at the bottom.....and if that's something you can't deliver...quit wasting my time and give me the name of a manager who can make that happen.....and at this point I think he realized I wasn't playing around.....now mind you I didn't get all irate and cause a huge scene or anything like that....I just said the above in a very firm voice.....but anyway he also said he's gonna have to call the insurance company (who my extended warranty is through) and see what they are going to cover........

More updates on that tomorrow.....

Anyone out there with any suggestions as to what I should do? I mean all due respect, i think this is total bull****, but I'm not sure if there is anything I can do to avoid any future bills or hassle from this.....anyone know of a number i can call or anything?

Also....anyone here by a used grand am and get the extended warranty through a company called Cost Gaurd? Are they a mickey mouse company or what? I mean as stated in the first post, the ignition coils were supposedly bad.....which is a part that the rep from cost gaurd said was covered....however the labor to put them in wasn't? This was almost 3 weeks ago now, and I still haven't seen a check for re-imbursement.....aparently you have to pay out of pocket and then they re-imburse you.......yet any time I've taken the car to the original dealer i bought it from, any work done under warranty hasn't cost me a dime....regardless of parts or labor......anyone have any ideas or had any problems with this company????

Brken123
12-15-2004, 09:52 PM
Well they replaced the brake switch....this was about a week ago......driving up the blue route today, and car started going in and out of "overdrive" again.....so #1 I don't think the brake switch fixed it, and #2 i'm taking it back to the dealer I bought it from.....I'll let ya know what they lie to me about next week after it goes in.......wish me luck :(

MagusXIII
12-16-2004, 05:32 PM
Steve, have you considered a computer reflash? It could be some form of defective program. IMO, that would be the least labor intensive issue next seeing as to how the brake switch did not solve the problem.

I remember that the 1998 Ford Escort ZX2 with automatic had an issue where the transmission failed to go back to first gear once the car came to a stop. It remained in OD and the only solution was to have the driver manually bring it to a lower gear. The problem was solved by a PCM reflash.

So seeing as to how today's automatic transmissions are controlled by the PCM, maybe a PCM reflash could solve the problem. Has this been discussed with dealer #3?

Brken123
12-17-2004, 12:00 AM
Steve, have you considered a computer reflash? It could be some form of defective program. IMO, that would be the least labor intensive issue next seeing as to how the brake switch did not solve the problem.

I remember that the 1998 Ford Escort ZX2 with automatic had an issue where the transmission failed to go back to first gear once the car came to a stop. It remained in OD and the only solution was to have the driver manually bring it to a lower gear. The problem was solved by a PCM reflash.

So seeing as to how today's automatic transmissions are controlled by the PCM, maybe a PCM reflash could solve the problem. Has this been discussed with dealer #3?

That's actually an interesting idea. I'll ask the guy at the dealer about it, because out of all the dealers the one i'm going to take it to seemed to know the most (atleast the trans tech i talked to anyway). Problem is the dealer is about an hour and a half away from my house. Anyway I talked to this guy before about changing from an auto to a stick tranny....he said it can't be done. Physically yes you could change all the parts and all over to put the tranny in and hook everything up, but you can't get a computer program to flash the PCM with that would support it. You'd have to get an after-market program, and he said the tools they use to do the flash go bad after you use it the first time. Hence if you flash it and start having problems down the road, the only thing the dealer can do is flash it back to the original program....which obviously was for an auto tranny.....but anyway he went real in depth as to why it can't be done, and based on the conversation he seemed to know his stuff. *Crosses fingers*...here's hoping he knows what's going on with my car.....hopefully he's seen it before or something. I'm going to take him for a ride when i take it in so I can show him exactly what it's doing.....possibly ask him to see if he'll bring the TECH II tool along so I can see what it does when the T/C locks and then unlocks about 4 seconds later. I'll post up with any updates......

Again thanks for the recommendation.....which actually reminds me to ask him if they have any flashes for the PCM at all.....maybe they came out with updates or something.....kinda like Windows XP with service pack 1, and now the latest nightmare....service pack 2......ok I'm just gonna leave that alone. Those who are into computers know what i mean by the previous sentence......