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Pontiac Bonneville Transmisssion



  • My 95 Bonneville goes into overdrive once then when you pass someone it kicks out. The car has to be turned off and restarted for it to go back into overdrive. The other gears are fine. It has been in the shop 3 times for this problem and it still is not fixed.
  • rhtransrhtrans Posts: 84
    Take it to a different shop!
  • kaylee01kaylee01 Posts: 2
    The 95 Bonneville has been to several shops noone can find the problem with the overdrive. The cylinoid has been changed and so has the transmission wiring harness and it still only goes into overdrive once. When you speed up it kicks out and won't go back into overdrive until the car is turned off. So I was hoping to see if anyone else had experienced this problem and what the outcome was.
  • victor53victor53 Posts: 8
    Yes, when I manually place the transmission into first gear the transmission feels solid, smooth and accelerates without hesitation.
  • i own a 95 bonneville sse it is now mar 08 i have 400k on this car i have done a lot of matience and repairs over time but now im having a problem with my transmission. the car runs great no major problems as i fix stuff before it goes. my transmission died 2 yrs ago so i bought a used one at a junk yard, i had a friend install it for me he knows cars preety good and has always done good by me. when he put the trany in he told me he had problems with the linkage cable??? now my car has a hard time shifting out of 2 gear i have to almost redline it to get her into 3 and even 4th. i was wondering if anyone knows if the linkage cable could cause this or is it another problem. i do most of my own work on my cars but i have never messed around with a tranny be4 looking for some insight thank you for your time guys.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,713
    What year and model car did the transmission come out of?

    Where year and model is your car? I am curious if you got an identical transmission or it was a similar model. If you know the model the car came out of, you can call a recycling yard and ask if it's right for your car.

    This message has been approved.

  • my car is a 95 pontiac bonneville sse the replacement tranny came from same yr and model, she has started to have a hard time upshifting and i was wondering if it could be something easily fixed or should i just look for another tranny
  • arehmarehm Posts: 3
    I have an 01 SSei Bonneville with 80k on it it has recently started shifting hard after it get warm. I was told that it could be going into LOPE mode. I also read that chjanging the thermostat and adding a trans cooler should take care of the problem. Anyone else had this problem or know what it might be?
  • I had the same problem with my 94 Bonneville SE (currently with 279,000 miles) about a year ago. I didn't go on the highway much, but every time I did I'd have to shut the motor off for a few minutes to reset the computer after the car shifted into the passing gear. It didn't do it that much so I just dealt with the problem, but now it will not go into overdrive at all. I went from 400 to 475 miles on an 18gal fuel tank (approx. 26.4MPG), down to 225 to 275 miles (15MPG) just because this car runs in the passing gear all the time. At 72-73MPH it runs at 3200-3300RPM. It should be at about 2100RPM in overdrive. With gas prices as high as they are, I will save myself more money than I will know what to do with... lol I have been talking to a few people and every one of them told me it sounds like the "transmission Control Solenoid". There are two of them, (the TTC lock-up and shift solenoid 1st-2nd and 3rd-4th & just a regular Solenoid) in my vehicle, and thankfully they are both external meaning they are on the outside of the transmission, and not inside that trans. pan. The Torque converter clutch lock-up (TCC Solenoid) is the one that works the overdrive gear I think, but I am not 100% sure. I am going to be changing both of these just to be safe. AutoZone has them listed at 28.99 and 26.99, one is in stock, and the other is a special order and will take 1-3 days to get. If you are still trying to get information about your problem, just let me know by e-mail, and I will let you know if by changing these two solenoids, it corrected the problem. My email is josephbelles (at) g mail (dot) com You can also see these parts by going to this website. (,11200623/shopping/partTypeResultSet.htm) Have a Great Day!
  • I have a 1994 Pontiac Bonneville. It roared like hell up to 120 mph before I took it to Big O Tires to have the pan gasket changed because it was leaking. Once I got the car back now it won't go over 60 mph. Any suggestions? Any and all advise would be greatly appreciated! :mad:
  • Hi I am new to this group, I find it great that you can come here and , with alittle help people can see the light at the end of the tunnel as they say. But i to have a 1994 bonneville, 220k Changed fuel pump, fuel filter , spark plug and wires and i think the coils were changed before i bought it, but my problem is overdrive, have done alot of reading , but dont seem to see an answer , gets to a certain speed and starts to feel like trany problem then if you put your foot into it it stops, or if you let off, has anyone found a fix for this??
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,713
    > then if you put your foot into it it stops, or if you let off,

    Can you describe more about what and when it's doing when you say it stops or if you let off?

    This message has been approved.

  • The ''buckin'' like its trying to shift into or out of overdrive....

    thanks for the reply.
  • I just resolved the "bucking" problem with the 4T65-E transmission on my 2002 Bonneville with 135,000 miles. This problem has multiple causes, but the main one is jammed shift and EPC solenoids. The jamming comes from particulates accumulating in the solenoids and impeding their functions. The particulates come from the overdrive and 3rd gear clutches burning out. Also, the bucking and, in my case, jolting, also came from wear in the 2nd gear spline, drive chain, boost valve, and channel plate sleeve.

    I asked the transmission specialist where I took the car if more frequent maintenance would have helped, and he said that while I could have gotten a few more miles out of the tranny by more frequent fluid changes ( I was changing at every 30,000 miles), these transmissions start failing at between 125,000 and 175,000 miles. Also, to completely repair the transmission is not cheap, at least not in my particular case, but it was less expensive than the down payment on a new car, and since financing a new car is next to impossible right now, and that I'm not ready to part with my Bonneville, I look at it as a new lease on life.

    1994usedbon, may your problem be less expensive and less extensive. The 4T65-E transmission didn't come along until 1997, so your experience may be much different. Good luck!
  • jgrovjgrov Posts: 1
    i have a 1999 boneville ssei and every time i accelerate it jerks in every gear is there something i can do and it also jerks when i shift to neutral what could be the problem?
  • I have 2003 Bonneville. It has about 130,000 miles on it and I do not know if the transmission fluid has ever been changed. The fluid levels are at the right level. Recently the has incurred a slight noticable lunge when shifting through the gears. I have been reading in the forum and curious if it is the Transmission Valve Body or the Transmission Torque Converter Solenoid. I am also going to change the Transmission Fluid. Are either of the parts external or are the inside the Transmission.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,713
    How's the motor running?

    This message has been approved.

  • The torque converter solenoid is internal. Of that, I'm certain. I'm not sure about the transmission valve body. After having multiple problems with the 4T-65E transmission on my '02 Bonneville last year, it's likely that major issues concerning jolting, lunging, or jerking when moving between gears is going to be caused by an internal component. Good luck, and hope your problem turns out to be an inexpensive one.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,713
    I repeat: How's the motor running?

    Have the plugs and wires been replaced at the 90-100K mileage as specified in the owner handbook? Plugs AC iridium same as originals?

    Are there any other parts that are not working quite right? MAF sensor might be one?

    Does the throttle body need cleaning and that extra goop blocking the bleed air around the throttle plate affecting how the IAC can control the very low speed mixture?

    Before blaming trans, always make sure the motor is up to snuff. Then it's time to be sure the transmission is doing what it needs.

    There also are a few who feel a motor mount wears and allows more movement giving more unevenness to the shifts.

    This message has been approved.

  • I have replaced the spark plugs, wires, new air filter, new fuel filter checked all of the fuses, changed the oil in this car. Sometimes when I start it takes several seconds for the engine to turn over and start the car. When I apply the accelerator it fires right up. I have also been using high octane fuel and a fuel additive. I have also used Lucas Injector Cleaner. The vehicle does get better fuel mileage even gotten 450 for an 18 gallon tank half highway. I do have a slight oil leak near the head. Also the slight jerking happens in cycles not all the time. Sometimes it shifts just fine and sometimes I can feel it noticably.

    Also the engine will sometimes stop running if left to idle for about 10 minutes. Once while the hood was open I noticed a slight puff of air/steam come near the water pump and intake. Any suggestions?

    To add to this... the service vehicle soon light comes on and off every few days. It has also been dying when turning slow turns or u turns. I assume the power steering is using up the last bit of power causing it die.

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