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Pontiac Grand Prix Transmission Problems

rayainswrayainsw Posts: 3,028
edited July 2017 in Pontiac
No joy.

Picked up my GXP this evening.
They replaced the throttle body.
They could not re-program the PCM.
( ? )
There is still an issue – an internal transmission problem.
They have ordered the part – a ‘valve body’.
Not available in the Southeast.
Request has been forwarded to Lansing.
(I am in the Metro tlanta area.)
So – I was offered the ‘loaner’ (a Chevy HHR – 4 cyl.) or I could take back my car – as it was – to drive until the part arrives.
Approx. 5 days = current estimate.
So . .
- Ray
Wondering (among several other things) how such a part could possibly not be available closer than Lansing . . .
2016 BMW 340i


  • chats1chats1 Posts: 158
    So sorry about your transmission problem. Your car is a 2005, right? Couldn't they overnight the part? You should have insisted. Twice my dealer had a part overnighted -- once on this car and another time on a GTP. I went back the next morning and it was there. On the GXP the latch had to be replaced on the hood. Door ajar kept on coming on even though the hood was shut. I have a strong feeling that the GXP is going to be a "flop." I may sell my 2006 even though I've had no problems. But, still there are issues re this car. Good luck! I have to say one thing -- maybe my brother was right. He warned me about this going -- switching from 8 to 4 cylinders. He said this was done before and had problems. I don't remember what car though.
  • evandroevandro Posts: 1,108
    Cadillac tried DOD in the late 70's, I believe. But then they used an 8-bit microprocessor with 2KB of memory. Now GM is trying the same with a 32-bit microprocessor with 1MB of memory. It was a good idea, but before its time.

    Then again, as any unproven technology, it's likely to have a few hiccups for some years until it's debugged.
  • bob97bob97 Posts: 16
    In addition to the much less powerful and less reliable microcomputer, the Caddy was also a more complicated 4-6-8 switcher and allegedly it was the middle 6 that caused the headaches. I always wished I had an 8 in my 97 Grand Prix, so I bought the GXP with my fingers crossed.

    Ray, I’m sure all the regular readers on this forum have their fingers crossed for you right now.
  • rayainswrayainsw Posts: 3,028
    “So sorry about your transmission problem. Your car is a 2005, right? Couldn't they overnight the part? You should have insisted.”

    Well, I suppose I could have said something more aggressive than I did.
    I was somewhat annoyed at the time, so I decided not to say anything until I was somewhat more calm.
    If the car had been either completely un-drivable –
    or at least somewhat more annoying to drive under my commute conditions –
    or if I had planned a long, outside the Metro area (cruise control safe) drive for this weekend -
    well, then I might have insisted more strongly.

    The other factor for me here is that I have not driven a GM vehicle (except rentals) since I traded my ’97 GTP in late 2000. I am using this experience to ‘test’ the Dealer Service and the GM parts system. I do like this vehicle quite a lot – and when I approach 25K – 30K miles (typically 2 years + / -) I will need to decide if I want to extend the GM warrantee and keep it beyond 36K Miles. In addition to my perception of the reliability, the service I can obtain will be major factors in my decision whether to keep or trade at that time.

    2 of my last 3 cars were Lincolns. The Dealer service and parts response (the few times required outside scheduled maintenance) were excellent.

    If I do not hear anything by tomorrow AM, I plan to call the Dealer again.

    Oh, and I see no indication that DoD is involved in this ‘event’. FWIW.

    We’ll see.
    - Ray
    GXP Beta Tester, apparently . . .
    2016 BMW 340i
  • rayainswrayainsw Posts: 3,028
    After 2 failed attempts at repair (see above for symptoms) a new transaxle was ordered & installed.

    Yesterday, I picked up my GXP, with the new transaxle installed.
    I have now driven it approx. 45 miles.

    No more surge, buck, chuggle.

    TCC lockup working as expected – and as it did previously . .

    With luck, this will be the end of the saga.

    - Ray
    Hoping every nut & bolt & connector is re-attached to spec.
    2016 BMW 340i
  • evandroevandro Posts: 1,108
    Sorry to hear that the tranny was indeed bad. I hope that this one lasts longer than the car.

    Good luck.
  • ocmike3ocmike3 Posts: 232
    Good luck with the new trans axle. How many miles did you have before it started to act funny?
    I have only put ~2400 on mine in 6 months (Its my weekend driver). Only complaint I have is a buzzy trim piece around the sunroof (which is why I prefer not to have them in addition to never using it)
    I must say that as a commuter car this car sucks!!!! but not in a bad way - its all the other drivers on the road! This car loves to kick and haul, but it was like being a rabbit stuck in a huge crowd of absent minded turtles...
    I drove it to work a few days and practically went crazy in the evening jaunt home. I think some of that hp transfers into the drivers seat and 70 -80 mph seems like a crawl. :P
  • rayainswrayainsw Posts: 3,028
    "Good luck with the new trans axle. How many miles did you have before it started to act funny?"

    Approx. 7,200 miles. - on the way back from a 600+ mile drive over Thanksgiving weekend.

    It went immediately and instantly from just fine to "oh, my goodness, there is a problem here". No gradual deterioration in trans. performance.

    - Ray
    Hoping I'll turn out to be the only 1 . . .
    2016 BMW 340i
  • allstarallstar Posts: 1
    My automatic 2000 Pontiac Grand Prix has been making a whining noise and is difficult to go into gear occasionally. I took it to a shop and diagnotics shows 1. Torque Converter 2. TFF Intermitent Stuck on on and 3. Maximum Adapt Long Shift. The mechanic clered the codes and took it for a ride. Checked diagnostics again after the ride and no codes. I drove it last night and it started that whining racing noise again and then eventually shifted into gear. Is anybody familiar with this? Do I have a transmission problem, only does it once in a while.
  • eckwheeteckwheet Posts: 2
    same problem. 2000 grand prix gt auto trans. Only notice this problem when car warms up and/or extended driving. Getting the "whinning noise" and also hard downshifts in all gears. only 55k on it! Turn the car off, wait a minute, turn back on. Problem goes away. msg 119-120 sounded similar in problem. Have you had this problem fixed?
  • jts9657jts9657 Posts: 1
  • italia68italia68 Posts: 2
    Hello thank you for your reply.... my car is totalled! Theres nothing left of the engine at all. I wish I would have known about this problem before so I could have it checked. I have contacted Pontiac so they do know I don't think it will do anything, maybe help someone else, they are supposed to get back to me in a day or 2.
  • cdamechcdamech Posts: 31
    I had s similar problem and thought it was the Transmission on my 1999 Grand Prix. It turned out to be the Power Steering Fluid being very low. Does your noise get worse when you turn the Steering wheel when in parked mode, Check Power steering fluid and TOP it up and see if you get the same noise. Power Steering Fluid level inidicator is hidden at the back part of the engine
    compartment and not checked regularly by service mechanics.
  • eckwheeteckwheet Posts: 2
    Trans slams in all gears when vehicle is driven for extended periods of time. Trany started acting up at about 45,000 miles (55k presently). No problems present them selves when the car is below operating temperature. Car runs perfect. If I only drove 10 miles a day, would never notice. Only seems to act up in "stop and go" driving. When the car develops the problem, it is accompanied by a power steering type whine.. I have changed the fluid/filter twice which did nothing. Could anyone shed some light on what this problem could mean? I'm beginning to think this trans is a lemon. Anything would be appreciated.
  • teasley12teasley12 Posts: 2
    Hello whoever can help! First of all my catalytic converter went out...luckily this was under warranty and I got it replaced free. About a week later, my transmission went out. Had it replaced leaving my car in the shop for 3 months. The mechanic said the pan underneath was full of metal from the transmission. Well, now my car has started making this noise when I'm sounds to me like an airplane fying through the air. All I need are some wings and I feel like it would take off. My boyfriend thought is was the tires so he rotated them...still making the noise, but seems to be getting louder. I'm also having some trouble with my power steering and the trac off light stays on most of the time and the car makes a roaring noise quite often and I can feel it when I depress the brake pedal. The mechanic that replaced the tranny said it would be ok to leave it as is because it's not actually affecting my brakes. (I couldn't afford to fix it at the time...tranny was almost $2,000)I only have a little over 80,000 miles on my car. Does anyone have a clue?
  • teasley12teasley12 Posts: 2
    It's me again! Just thought ya'll might need a little more info about my car. It's a GT with a 3800 series engine. I would also like to add that the car sounds pretty good when it's just idling. It doesn't start making the airplane noise until I begin driving. The faster I get, the louder it gets! The service engine soon light comes on but doesn't stay on. I just need some help. I already know that a wheel sensor needs to be replaced which I've been told that the whole hub has to be replaced at the same time...over $300. I've already spent all of my savings on the tranny! Someone please tell me that my other problems aren't serious!!
  • bman64bman64 Posts: 14
    power steering is going bad thats the whining noise
  • pblithpblith Posts: 1
    how did you get the catalytic converter replaced for free? My car is in the shop w/ this problem now! Thanks!!
  • jpfjpf Posts: 496
    The catalytic converter is covered under the emissions warranty for up to 8 years or 80,000 miles (130,000 km). I have a 2000 S10 that had just under 80,000 miles when it went. I moved from Canada to the U.S. and GM still covered the converter replacement free of charge.
  • Hello all.I have a 2000 Grand Prix GT with 200,378 miles.About a month ago the transmission just stopped going into overdrive.Transmission fluid has been changed every 20,000 miles.Last change was 5 mos. ago.Transmission changes perfect except will not go into overdrive.When driving at about 50 miles per hour it will make an attemt to go in overdrive then rpms jump up 200 from about 2300 to 2500.also at times it fails to down shift when turning in when i dont come to a complete stop.i have been told it could be the pressure control solinoid or the tcc solinoid.if anyone can help or have ideas whats going on any help will be greatly appreciated.Thank You. :sick:
  • samb2samb2 Posts: 1

    I am in a very simillar situation. I just noticed that my GT with 210k is not going into overdrive. I did a tranny coolant flush 2 month ago. so it could have been since then, or just last week. Any ideas? I will shift all other gears right but overdrive.
  • pupppawpupppaw Posts: 1
    Hi all.... I need help.... I have a 2000 Grand Prix GT and it has about 84,000 miles on it. About a year and a half after I got this car the over drive gear went out which was under warranty . But..... in feb.06 the transmission went out. I have had to this date 2 re-built transmissions, many solenoids replaced in it, internal wiring harness and even a new computer put in it....(the 1st time the transmission was fixed they found metal shavings in the pan) Now the problem that I am having is this.... When I put the car into drive it is taking off in 3rd gear ( which feels like I'm towing a house behind it) sometimes the service engine light comes on and sometimes it kicks real hard into the correct gear, then runs great after that. There have been times where I have turned the car off and waited anywhere from 5 mins. to a few hours and started the car up and put it into drive and everything was smooth. Anyone ever heard of this or have any ideas what might be wrong?
  • suzyq0000suzyq0000 Posts: 3
    According to my husband it could be a bad 1-2 shift solenoid and/or a pressure control solenoid.
  • abbierabbier Posts: 1
    I am having the same problem now. My 2001 Grand Prix has 75k and when it shifts, it makes a wining sound and then shifts really hard, but this is only if I drive it more in one day than usual. If you find out what it is let me know. I am thinking the trany is going, which I heard is not uncommon on these.
  • slaplanteslaplante Posts: 8
    Hi all, I have a 1998 GTP that I have had for 6 years. It has about 160,000 miles on it. My car has had most of the problems people have discussed here. My lastest problem is that sometimes when I go to start my car, it won't start unless I press on the gas. Once it starts, I can't let off on the gas or it will quit. This has happened three times now. In order for me to get it home, I had to keep my foot on the gas at all times (or it would quit) and throw it into neutral and use my left foot on the brake to slow down. After getting the car home and letting it set for about 20 minutes, it started and ran fine. Another problem that has me stumped is when I take off very fast (with the help of the supercharger) from a stop, I get this clunking noise that I can also feel from under the car. Once the car gets up a little speed, the clunking goes away. Someone has suggested it might be the transmission mounts. Has anyone else experience this? I have had everything in the front replaced including the ball joints, a-arms, tie rods, bearings, bushings, ect. Any and all help is much appreciated as I love my car and don't want to get rid of it. Thanks
  • Check the fuel filter and pump. It may be that the filter is clogged and needs replaced. After enough fuel is thru it may free up enough to run regularly but when the car cools back down the clog may reseat in the filter. I have had this problem on other cars and it helped.
  • slaplanteslaplante Posts: 8
    Thanks for the info but we changed the filter about 5 months ago. The car had been sitting for several hours before it refused to start. I drove it for over an hour with it quitting whenever I let off on the gas. After getting it home, it only set for a few minutes before it decided to start like normal and run like normal. It was almost like shutting it off for a few minutes gave it time to reset a sensor or something. That is why I am leaning towards some kind of sensor. This has happened three times so far at a rate of about once every 2 or 3 months. After the first occurance is when we changed the fuel filter.
  • chele5chele5 Posts: 8
    I had the same problem with my 2001 grand prix. The dealer said it was the fuel regulator. I thought the car was going to fall apart with the clunking noise that was coming from under the hood. It wasn't cheap - around 400.00 - but it fixed the problem.
  • chele5chele5 Posts: 8
    The dealer told me that it was a trany job - but said nothing about a rebuild - just a replacement part (around 500.00)
    When I spoke with several trany shop's they all said the same thing. REBUILD. Because if you replace that part within 6 months you will have to rebuild anyway (cost you double in labor costs). It's a nasty truth about these cars. They said most tranys go around 70-80,000 miles and that I was lucky when mine went at 125,000.
    Good luck.
  • slaplanteslaplante Posts: 8
    Could you describe exactly what your car was doing please? The garage I took my car to could not tell me what was wrong with it. They were going to just start replacing parts until the problem was fixed.
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