Question about 2003 Pontiac Grand Prix

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Grandprix 2003 code P1811 long shifting or hesitating when accelerating

When accelerating from stop the transmission hesitates or pauses then shifts the problem is intermitent? Does this mean my trany is on its last legs?

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  • Anonymous Mar 19, 2014

    Hard shift

  • Anonymous Mar 24, 2014

    What does this mean?

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Have a Code P1811 on my 2002 Pontiac Grand Prix. The only thing I have noticed is it gets warm very fast. Haven't noticed any slippage with the tranny...What do I do??

Posted on Jul 03, 2009

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Could be a vaccum line leak.Does it reve up and not move?

Posted on Jan 10, 2009

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My car is hesitating when I accelerate when I first start it after sitting idle. I have been told it is the 1,2 shift cylanoid. What is this, how much to repair, how serious, I have taken it in to the...


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Jun 30, 2017 | 2003 Pontiac Grand Prix

2 Answers

Transmission occasionaly hesitates and I can feel it when it shifts, more than I should.


There are diagnostic tools that could help detect what your problem is. The Snap-On Modis, or preferably a "Tech-2" GM scanner. Any reputable transmission shop, or GM dealer should have at least one of the two. It sounds to me like it could be the transmissions "EPC" (Electronic Pressure Control solenoid) The EPC controls main line pressure, in an effort to keep shift firmness, and shift duration at one specific level. This is to compinsate for the natural wear a transmission encounters, and to keep emissions as low as possable, by keeping shift duration low. When the EPC malfunctions (and thats somthing that they like to do in the 4t65E), it typically starts to shift harder than normal. They typically throw a P1811 code. (P1811 is a "max adapt-long shift" code) And the malfunction can be intermittent. Hope this helps, and good luck.
Logan

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