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Pontiac Montana Transmission Issues

59 messages,  Last post on Nov 23, 2009 at 7:24 PM

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

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#16 of 59 Re: Pontiac Montana transmission problem [deestes] by fclay Mar 19, 2007 (11:55 am)
Replying to: deestes (Mar 19, 2007 6:44 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. Replies to this message: deestes (Apr 03, 2007 5:02 am)
#17 of 59 Re: Pontiac Montana transmission problem [fclay] by ejg80s Mar 24, 2007 (10:27 am)
Replying to: fclay (Dec 24, 2006 7:15 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 59 Re: Pontiac Montana transmission problem [fclay] by deestes Apr 03, 2007 (5:02 am)
Replying to: fclay (Mar 19, 2007 11:55 am) I plan on taking it to the local Pontiac dealer for evaluation. I will let you know the results.
#19 of 59 Transmission by michamaiu Apr 19, 2007 (7:53 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 59 Pontiac Montana Transmission shift problem by deestes Apr 21, 2007 (4:17 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 59 Whinning Transmission over 60mph by montana2001 May 21, 2007 (8:27 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..... Replies to this message: michamaiu (Jun 02, 2007 6:17 pm)
#22 of 59 Re: Pontiac Montana transmission problem [fclay] by soulman613 May 27, 2007 (8:44 pm)
Replying to: fclay (Dec 24, 2006 7:15 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. Replies to this message: fclay (May 28, 2007 8:37 am) jswiz (May 28, 2007 9:39 am) soulman613 (Dec 24, 2007 9:15 pm)
#23 of 59 Re: Pontiac Montana transmission problem [soulman613] by fclay May 28, 2007 (8:37 am)
Replying to: soulman613 (May 27, 2007 8:44 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 Replies to this message: jswiz (May 28, 2007 9:39 am) soulman613 (Dec 24, 2007 9:15 pm)
#24 of 59 Re: Pontiac Montana transmission problem [fclay] by jswiz May 28, 2007 (9:39 am)
Replying to: fclay (May 28, 2007 8:37 am) I have similar problem, slipping transmission doesn't shift when hot. Drive in cool weather all day, no problem. Drive in warm/hot weather and the transmission misses gears all the time. Loses power but RPM's don't change. I was going to trade it in and the sales man (20+ years experience) said he thinks it definitely NOT the tranny, but more likely the Catalytic Converter. An old one (2001 112k miles) has junk in it and won't operate properly especially at normal temps and/or the Ox Sensor might be bad. He was certain there was no problem with the tranny itself? any help, opinion, experience? Long drives on highway and stall/surges occur (when hot), drive around the neighborhood and hardly notice any problems, some loss of power on starts but not many noticable?
#25 of 59 Re: Whinning Transmission over 60mph [montana2001] by michamaiu Jun 02, 2007 (6:17 pm)
Replying to: montana2001 (May 21, 2007 8:27 pm) montana2001: well, at 78,000 miles, it gave out on me. Started grinding horribly then just wouldn't move. Lucky for me it happened just around the block from me and within a few blocks of my mechanic (the transmission specialist!) Had a rebuilt installed and we're back in business. My mechanic was right, he said everything was pretty chewed up inside. He said he has seen this before and actually had just replaced one on an Aztec (same unit). The vehicle is driven mostly by my wife, but I do recall her saying she was noticing grinding or vibrating, too.

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