Last post on Oct 25, 2013 at 5:57 AM
You are in the Pontiac Bonneville
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Pontiac Bonneville, Transmission, Sedan
#71 of 80 Re: 1997 Bonneville [buddy0310]
Aug 18, 2012 (1:59 pm)
Buddy: We had a 1998 B'ville that started slamming and missing shifts. The first symptom only occurred when turning right AND going slightly uphill. Sounds strange but as it got worse it slammed and shifted very hard after over revving the engine. Took a very bright service foreman at the Pontiac dealer (Same as Buick, Chevy, Caddy) to diagnose the external shift solenoid on the AT. The screens clog up after some time and even a trans fluid change does not always get it. They replaced the external solenoid w/o dropping the trans so it was relatively cheap (vs. $2000 or more for exchange trans).
If you get a good trans guy he will know about it. Yours may be an internal problem, that is more complicated. Good luck.
Aug 22, 2012 (3:45 pm)
Last week, my car gave no warning & quit working! The motor locked up...there is no coolant in the oil. Someone thinks it might be the 'torque converter', any suggestions?
#73 of 80 Re: 2003 Bonneville SE - Transmission Slipping/Banging into gear [emeacham]
Feb 10, 2013 (5:06 pm)
Hi i was having the same problem as you described did you ever find out what the problem was ? ive took it to 3 shops and they dont know what is wrong plz help
2002 pontiac bonneville
May 02, 2013 (1:21 pm)
I have a 2003 Pontiac Bonneville..today it didn't want to go into reverse..i finally got it to go but lunges everytime I take off from a complete stop.its never done this before.could it simply be in need of fluid or such?
#75 of 80 Re: Torque converter and solenoid replaced but engine light come on [chris1554]
Jul 18, 2013 (4:34 pm)
The check engine light can come on and stay on even if there is a very small air leak. If it runs fine and evrything is good i wouldnt worry bout the cel. I had an oldsmobile and even after i fixed some of the problems it jus stayed on. I wouldnt really be too worried.
#76 of 80 Re: transmission? [imakelkat]
Jul 18, 2013 (4:38 pm)
If its lunging like a speedy bullet then if you took the cylinder manifold off and didnt replace the gaskets and torque it down to what its suppose to be it could have an air leak from the warped gaskets. Or possibly throttle position sensor is going bad
#77 of 80 Re: 99 Bonneville shifting hard [ryankoglin]
Jul 20, 2013 (5:34 am)
I know this is a very old blog but for anyone searching for help and might read this. I had the same problem along with missing and stalling after it got hot and seemed like the tranny was shot. I took it to a transmission shop. they said i needed presure swith soliniod and touc converter lock up soliniod and i would be better off just getting complete tranny overhal. $2100 buck. huh i ended up relpacing mass air flow sensor runs like new car. I can not believe it $120 bucks for a carban remanufactured maf sensor. Make sure you dont get one of those $39.00 maf it might run worse. Good luck
#78 of 80 Transmission goes out of gear
Oct 24, 2013 (4:18 pm)
I have a 2000 Bonneville, Trans worked fine then one day all of a sudden it was like I kicked it out of gear, would not take any gear until I completely stopped turned it off, set there a minute then started back up , put it in gear and pulled out. It was shifting fine for a few miles then it did the same thing again. It will take gear after you turn it off, then restart it. what could be causing this? Any info will help.
#79 of 80 Re: Transmission goes out of gear [sweethavenfarm]
Oct 25, 2013 (4:54 am)
My guess is that the shift solenoid is clogging up and when you turn car off it corrects temporarily. Any reputable transmission shop can fix it without the trans being removed IF this is the problem. My 1998 Bonneville was slamming and not shifting. Tech diagnosed it correctly and fixed it with new solenoid that had a revised screen on the inside to prevent fouling. good luck.
#80 of 80 Re: Transmission goes out of gear [sweethavenfarm]
Oct 25, 2013 (5:57 am)
You don't mention the mileage or the maintenance history for the transmission. But assuming there's not a lot of negative there, it sounds like the transmission is losing pressure from the PCM.
Is there a noise like a whine while it's doing this with the engine running?
Does it reset to operate after 10 seconds or so and then turn the key on, or does it require a long sitting time? The computer control should reset if it picked up a code in a short few seconds of OFF time for the key.
What does the fluid level look like when the transmission is warm, idling in park, level ground and you check the dipstick on the trans? It should be at the full level.
Then what does the fluid level look like while idling when the transmission has refused to engage? Running, idling in park.
If the fluid level changes during the problem occuring, that might help.
What does trans do if you put it in the 1 position for hard first gear engagement? in 2?
The FSM talks about several solenoids involved for various symptoms.
But for dropping out of 3rd/4th low fluid level or low line pressure are first on the analysis algorithm. Line pressure might be due to a worn out Pressure Control Module, an item sometimes needing replacement in 4T65e's.