Question about 2005 Pontiac Bonneville

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Tansmission slips transmission slips and fluid is fine if i shut off engine and restart it will work for a short while then slip again any ideas?

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When you say the trans fluid is fine, is it a clear reddish color? does it smell burnt? also does your check engine light come on at all? how many miles are on the car? GM usually recommends a trans fluid flush at 100k miles under normal driving conditions and at 60k miles under more severe driving conditions. it sounds like there may be an internal problem with the bands or the pressure may be low. I would recommend taking the car to GM dealer for a better diagnosis as it sounds like it will continue to slip when it gets to normal operating temperature and it will get worse in the future. another option is to add 2 bottles of Lucas trans fix (48 ounces total) to the trans fluid but you will need to pump out that much fluid if the trans fluid is already full so you don't over fill it. the lucas trans fluid additive does work pretty good unless their is serious internal damage already done. Good luck!

Posted on May 08, 2014

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Posted on Jan 02, 2017

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hotrodtod38
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SOURCE: transmission is leaking and slipping in & out of gear

hello sounds like your front pump is out ,you will need tohave it repaired god bless

Posted on Feb 14, 2009

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SOURCE: transmission problem 2004 pontiac montana van

i have the same problem when iam driveing it kick hard into 1 gear and 2,,, shut it off,,and it stops for about a day or 2,,, then comes back,,, it is still under warranty,, and mr,trann said the montanas or bad for valve bodys,,, i,ll let you know how i make out,,, but my shop said he was going to rebuild the hole thing,,,witch is good beecause they put all up grade parts in,,,,,, unlike the **** GM parts

Posted on Mar 03, 2009

  • 158 Answers

SOURCE: Slipping Automatic Transmission

The transmission fluid gets dirty especially over a period of time and the filter gets clogged and gunk builds up. This will cause the transmission to slip and you should check the transmission fluid stick at least twice a month to make sure it is at the proper level or have your transmission tuned up by a trained professional at a dealership or transmission shop once a year. You will be glad you did. Treat your car with love and it will be good to you.

Posted on Oct 01, 2009

RonPark
  • 855 Answers

SOURCE: my transmission is slipping when accelerating from

The forward clutches are going bad is the most likely problem. To repair the trans should be rebuilt.

Posted on Oct 08, 2009

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ZJLimited
  • 17970 Answers

SOURCE: Transmission Slipping 2003 Pontiac Montana Checked

There are two possible causes. First is a leaking lip seal causing the system to slip, which the computer sees and it, the computer then increases the pressure to accomodate the slip, causing the bang. The second is a problem with the valve body. Either a binding valve or pressure regulator.

Both of these will require the transmission to be removed to check.

Hope helps.

Posted on Oct 12, 2011

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1 Answer

Transmission slips but when i shut engine off and restart it will work for a short while then slip again. any thoughts?


Transmission bands are slipping and requires an trans inspection. Most trans shops will give you the inspection for free when you tell them your bands are slipping. This is a low cost minor adjustment that doesn't require removing the transmission unless further problems are discovered after the inspection. They will need to make this adjustment for a inside peak to make a proper determination.

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