Question about Pontiac Montana SV6

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My SV6 will randomly hard shift. It doesn't do it all the time but it does it a lot. I've narrowed it down to notice it does it after the Van has been warmed up, usually about 1hr after start up. It has not problem getting in and out of gear, it just shifts hard when going into gear. Is this a transmission issue or could it be related to my ABS/Traction Control sensor being bad?

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If you have a bad sensor it very well could be..I know the speed sensor, abs, and traction control can affect the transmission. I had a bad speed sensor give me those problems and when it went out the speed sensor kept my car from changing gears period.
My Pontiac gave me the same problems so I would look at changing the wheel speed sensor.
Getting the computer codes will tell you alot.
Hope this helps you in the right direction.

Posted on Mar 24, 2011

  • Kenneth W Mar 24, 2011

    Thank you very much that helps. I've been told could be the transmission or CV axel. Now I'm not a mechanic but neither of those made any sense to me. Long story short I figured it had to have something to do with the sensors, it would only shift hard when sensor alerts on the dash are be on. Thanks!!!

  • Larry Bogenschutz
    Larry Bogenschutz Mar 24, 2011

    you are welcome and glad to help!!

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