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Pontiac Montana Transmission Problems

71 messages,  Last post on Nov 24, 2012 at 8:42 PM

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What is this discussion about? Pontiac Montana, Pontiac Montana SV6, Van

Messages Page 3 of 8

#14 of 71 Pontiac Montana transmission problem by fclay

Dec 24, 2006 (8:15 pm)

I have a similar problem with my 1999 Montana transmission that another writer had. I have a problem with the transmission slightly late shifting and at the same time hard shifting. It did not happen very often when I bought the van with 70,000 miles on it a year ago. It would show up when the 4th gear would hard shift and when I stopped at a light, it then it would do it every gear. If I stopped and turned it off for 20-30 seconds and restarted it, then it would be fine. It now is happening more often and I am taking it to have a computor road test done. Would like to know if anyone else had this kind of problem and what was the outcome?

#15 of 71 Re: Pontiac Montana transmission problem [fclay] by deestes

Mar 19, 2007 (7:44 am)

Replying to: fclay (Dec 24, 2006 8:15 pm)
I am having the same apparent problem with my 99 Montana (as fclay). Did you find the cause of your problem and what was the ultimate solution?

#16 of 71 Re: Pontiac Montana transmission problem [deestes] by fclay

Mar 19, 2007 (12:55 pm)

Replying to: deestes (Mar 19, 2007 7:44 am)
Not as of yet. Closest I came is the Transmission Pressure Control Solenoid (PCS). Maybe the problem, i don't know yet.
Let me know if your mechanic thinks thats it too.

#17 of 71 Re: Pontiac Montana transmission problem [fclay] by ejg80s

Mar 24, 2007 (11:27 am)

Replying to: fclay (Dec 24, 2006 8:15 pm)
Also having similar problems with my 1997 Trans Sport Montana with 115,000 miles on it. Happens on highway when a hard shift is needed at a high speed to go up a hill. I pulled over and did not shut the van off and then tried to drive again and it was stuck in 4th gear. I pulled into a rest area, turned off the van for a while to eat (about 20 mins), then started it up and pulled back onto the highway. The problem cleared up and the check engine light did come on after about 10 mins. Drove it home on the highway making sure I did not hard shift the van at any high rates of speed.

#18 of 71 Re: Pontiac Montana transmission problem [fclay] by deestes

Apr 03, 2007 (6:02 am)

Replying to: fclay (Mar 19, 2007 12:55 pm)
I plan on taking it to the local Pontiac dealer for evaluation. I will let you know the results.

#19 of 71 Transmission by michamaiu

Apr 19, 2007 (8:53 am)

Hi, everyone! I haven't seen my problem posted, but if anyone reading the forum has similar symptoms, let me know! My '01 Montana has a "whining" noise that sounds like it's downshifting, but it is not. The engine RPM stays constant. It seems to happen around 40 mph when I let off the accelerator, and goes away if I accelerate. This has been going on for quite a while, almost two years I would say. I have taken it to my local mechanic who diagnosed it as a planetary gear problem (he happens to be a transmission specialist, by the way,and I regard him as very reputable), and said it could fail tomorrow or last for years to come. I just got back from a 1,000+ mile road trip which he advised not to take, but I felt confident as this vehicle has been doing this for quite some time.

#20 of 71 Pontiac Montana Transmission shift problem by deestes

Apr 21, 2007 (5:17 pm)

Fclay it appears your mechanic is correct. I took my Montana to the local dealer and they ran a scan. Code indicated pressure control solenoid. Service mgr. indicated past experience was that solenoid sheds fragments that contaminate valve body. Engine/transmission must be suspended to remove cover and valve body for removal and cleaning. $100.00+ in parts but a ton in labor. Long story short...$900.00 later transmission is fixed and working properly.

#21 of 71 Whinning Transmission over 60mph by montana2001

May 21, 2007 (9:27 pm)

My 2001 Montana whines when driving over 60mph. The sound goes away when off of the accelerator, Also makes a very loud grinding/vibrating sound when in stop and go traffic and feels like it is trying to lunge forward and the brake pedal is pushing back. When I let go of the brake and then re-apply it, this pedal pushback and grinding/vibrating stop. Took it to the dealer today, they have stated the pressure control solenoid could be at fault but it isn't going into 4th gear (overdrive) this sounds similar to the problem that deestes and michamaiu reported here. Did either of you experience this this way or anything close? Should I just replace the pressure control or do I need to replace the planetary gear. Please advise.....

#22 of 71 Re: Pontiac Montana transmission problem [fclay] by soulman613

May 27, 2007 (9:44 pm)

Replying to: fclay (Dec 24, 2006 8:15 pm)
Hello fclay
 
I have 03 montana and it has the same issue as yours.
Shifts 2 & 3 are kicking late, plus mine has the radiator
coolant is getting oil leak. I would appreciate if any one
can help in these problems. rebuilding the Trany is expensive. Any thing I could do before I run into deep bocket delima?
 
This is my first time here & it's very informative.
Thanks to you all who's trying to help.

#23 of 71 Re: Pontiac Montana transmission problem [soulman613] by fclay

May 28, 2007 (9:37 am)

Replying to: soulman613 (May 27, 2007 9:44 pm)
Hey soulman,
Go to #20 by deestes, he and I had the same problem and got the same solution. Ours was the Pressure Control Solenoid. AS for the radiator, it sounds like you may have a seal leak at the manifold. I took mine to the mechanic and asked for a check of my Pressure Control Solenoid, you may find your solution to the other problem in the process.
 
Frank
Debtfree.Print2Publish.com
Whymoney.Print2Publish.com

Messages Page 3 of 8

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