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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1 Answer

I recently installed new ignition coil and my car still has hesitation upon take off,whats the symptom of a bad trans sensor?


run the fault codes as the hesitation could be acceleration position sensor of maf/vaf sensor related
as for the transmission it could be a solenoid or pressure sensor and that will also be in the fault codes
If you have not changed the transmission oil in the last 60.000 miles , it would be a good time to do it as the problem may be from dirty oil

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Hesitation from stand still in 2003 Nissan Murano


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My 2003 impala was diagnosed and it came back with two codes and they are p0742 and p1811.


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I HAVE A 91 SEDAN DEVILLE.4.9 PORT FUEL INJECTION V8. I HAVE PLENTY OF ACCELERATION FROM STOP TO 20-30MPH. BUT WHEN I AM AT ANY CRUISE SPEED AND STEP ON THE ACCELERATOR IT HESITATES AND DOES NOT...


Sounds like a malfunctioning egr system. Too much egr gasses at once will lean out the air fuel mixture and cause hesitation in an engine. Just my 2 cents.

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Trembling while shifting on '02 F150 King Ranch


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Your vehicle should use Mercon V --PERIOD
Change it at least three times, to get the Lucas out.

Have the TPS Sensor checked out.
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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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