Question about 2003 Pontiac Grand Prix

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My transmission will not shift out of first gear, 2003 pontiac grand prix

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Although there a several possibilities, the most likely is that your vacuum modulator. It could be bad or the vacuum line could be disconnected. It is possible you might have another vacuum leak that is causing you to have to little vacuum to run the modulator.
Any other possiblities would require more info or even hands on to diagnose.

Posted on May 31, 2010

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Either a sticky valve body piston or a bad 1st gear solenoid

Posted on May 31, 2010

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