Last post on May 23, 2013 at 6:47 PM
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Pontiac Grand Prix, Transmission, Sedan
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#451 of 487 2006 Pontiac Grand Prix 3.8 L
Jan 04, 2013 (8:19 pm)
When on the interstate,with speed of 70 mph or over,the car starts kicking in and out of over drive sporadically causing the tack to jump between 1 and 3. Please if anybody knows what is wrong please help.
#452 of 487 Re: 2006 Pontiac Grand Prix 3.8 L [robrulz]
Jan 05, 2013 (4:58 pm)
I had a similar experience on my GXP and GM changed the transmission. Mine started off like that and progressed to all speeds, I'm not convinced its not a computer problem and the slipping in and out of overdrive is not a symptom of the bad cptr that progresses to kill the transmission. My new trans is a little over a yr old and it's starting it again. If u have a ck eng light look for code po328. Good luck the trans cost me over $3300!
#453 of 487 Re: 2006 Pontiac Grand Prix 3.8 L [2006gxp]
Jan 05, 2013 (5:45 pm)
It has not done it in any other speeds, just when i am traveling on the highway and at speeds 70 mph or more, also have noticed that it sometimes does it when i am traveling up hill on the highway. The tac meter jumps up and down. I don't have a check engine light,never had one on or come on since it started doing this..... Just wanting to know if anybody knows what is wrong with it and if anybody knows how to fix it?????
#454 of 487 Re: 2006 Pontiac Grand Prix 3.8 L [robrulz]
Jan 05, 2013 (8:09 pm)
That's exactly the way mine started too. Subtle at first...then worse at slower and slower speeds. Eventually your Torque Converter will explode internally....destroying your entire transmission.
You are #334 that I know of so far.....and GM will screw you.
#455 of 487 Reply to: 2006 Pontiac Grand Prix 3.8 L [robrulz]
Jan 06, 2013 (2:15 am)
We have a 2006 Grand Prix GXP. Tranny went out. My best advice to you is have a GM service shop do the work. Contact Pontiac customer service and see if they can reimburse you for some of the repair costs. My wife had a local service shop do the work. We contacted Pontiac customer service because another person on this website said they got half their cost back. We were left with the whole thing just because GM didn't do the repair. GM DOES NOT STAND BEHIND THEIR PRODUCTS! The transmissions have been a big problem on several of GM's products but they will not do a damn thing about it. I work for Toyota and they aren't without their problems. Everyone knows about their recalls but they will take responsibility and stand behind their product. GM should have shut down and not gotten help from the bailout. I have driven and owned GM products since I was old enough to drive. That's all my parents owned also. But I don't believe I will own another one after all of the grief I have experienced and by the messages I continue to get from people suffering the same trouble we did.
Good luck to you and I hope they will help you with your problem.
#456 of 487 Re: 2006 Pontiac Grand Prix 3.8 L [robrulz]
Jan 07, 2013 (9:40 am)
Sorry to hear about the troubles you're having with your Grand Prix, robrulz! Have you made any progress on this since your last post?
Sarah, GM Customer Service
#458 of 487 Re: 2006 Pontiac Grand Prix 3.8 L [markg16]
Jan 07, 2013 (6:05 pm)
i have a 2006 gxp that had same problem last year at 75000 miles. Car was never driven hard. I contacted GM and I had to take it to a GM dealership for inspection but they did replace the tranny with a $1000 deductable. My problem started on the highway first then on hills and was starting to do it in lower speeds when i got it fixed. It has been a year and I plan to trade the car soon before I have any further problems
#459 of 487 Re: 2006 Pontiac Grand Prix 3.8 L [gmcustsvc]
Jan 07, 2013 (6:39 pm)
No.... I haven't made any progress on what the problem is or how to fix it. I have had people tell me that it is the transmission and it will get progressively worse over time and i should take it to a GM Service Center. I took it in when it first started doing this and they told me that it was the throttle body... I had them put a new one in and it didn't fix the problem, i am still having the same problem and it is getting worse and to make the problem worse my warranty has ran out now and if it is the transmission i can't afford to fixed it now. I wish they would of fixed it properly the first time so i wouldn't be still dealing with this issue now. All i want is to know what exactly is wrong with it and how to fix it.
#460 of 487 Re: 2006 Pontiac Grand Prix 3.8 L [robrulz]
Jan 08, 2013 (1:26 pm)
If you were planning on returning to the dealer, we can look into this further with them. Please email us at socialmediagm.com (include your name and contact information, the last 8 digits of your VIN and mileage, and a brief summary of the situation).
Sarah, GM Customer Service