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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  • Pontiac Master
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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


Hi,

Condition


Some owners of the above vehicles with a Hydra-Matic 4T65-E transaxle may comment on harsh upshifts or harsh garage shifts, soft shifts, shudders on hard acceleration, or shifts erratic. These conditions may appear intermittently or set a DTC P1811 or P0748. During diagnosis, a low or high line pressure (actual versus desired) may be observed.

Cause

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.
To verifiy the exact failure, a line pressure check will need to be performed.

Hope i helped you.

Thanks.

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