Question about 2002 Pontiac Grand Am

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Tranmision on 2002 grand am started shifting hard only 50,000

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If your unit has a vacuum modulator on it (small can with a vacuum line on radiator side of trans) check that the vacuum hose has vacuum and that there is no trans fluid in it...any fluid that is on the vacuum side of the part indicates that it has failed. That is the usual cause of hard shifting. Another item less serviceable would be an accumulator spring.( You need a manual for those and some are internal.)

Posted on Jul 07, 2009

  • MOTOR62500 Jun 30, 2012

    a 202 gr am does not have a vac modulator you idiot.

  • Richard Scordino Jul 13, 2012

    Pretty sure I said "IF".... AND also mentioned something else besides modulator, So, why not actually READ *****!!! BEST way to diagnose is with a line pressure gauge and other test equipment. How many people have one and know how to use them???



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What is code 1811 on 2000 buick centryclunks into gear AFTER 25 TO 30 MILES . TRANMISION PEOPLE SAY THAT THE TRANMISION NEED REPLACEING



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The above condition may be due to any one of the following which may affect line pressure output:
• Sediment inside the pressure control (PC) solenoid valve, causing the PC solenoid valve to mechanically bind. • Sediment in the valve body, causing the torque signal regulator valve to stick. • Incorrect transaxle oil level.
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Hope i helped you.


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Hey guys, I have a 2002 Buick Century which I purched new in 2002. The car today, 6-9-09 has 54,000 original miles. Its driven by my wife who took it in for service. Noticed that occasionally the car who...

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