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Buick Rendezvous transmission shifting

4 messages,  Last post on Oct 28, 2009 at 6:27 AM

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#1 of 4 transmission shift by rkirkwood Sep 30, 2009 (5:23 am)
'06RDV with AWD.i,ve got 70k on this car and it runs great with no issues until this morning. i have experienced a hard shift from 1st to 2nd gear the whole way to work,which was mostly stop and go traffic for 25 miles. fluid is okay...looking for suggestions. Replies to this message: spike99 (Sep 30, 2009 3:49 pm) rkirkwood (Oct 01, 2009 5:34 pm)
#2 of 4 Re: transmission shift [rkirkwood] by spike99 Sep 30, 2009 (3:49 pm)
Replying to: rkirkwood (Sep 30, 2009 5:23 am) .    If your RDV has the 4T65E transmission, see:   "Intermittant Harsh Shifting / Pump whining, Possible Code P1811: This is perhaps one of the most common problems with this transmission. It has been a problem since the release in 1997 and can happen for no reason at all even with clean fluid and very low mileage. The EPC solenoid is probably bad and again is very common to happen. The EPC solenoid controls line pressure and has a spool valve which oscillates back and forth to regulate transmission line pressure based on commanded pcm signals dependant on lots of various inputs of the vehicle. The spool valve in the solenoid will bind up and cause loss of pressure control from the pcm. The pcm constantly monitors shift timing in milliseconds and if this is not within programmed parameters after a few shift cycles the pcm triggers trouble code P1811 which is Max Adapt / Long Shift. This code will not set the SES light but will dissable all adaptive shifts and will max out line pressure in the transmission which causes the harsh shifts and can also cause the transmission pump to whine because it is supplying fluid at a high rate and pressure and puts more stress on it thus creating the whine. Generally shutting off the car will make this condition go away until you drive a few more miles or the vehicle warms up and the harsh shifting will return. Replacing the EPC solenoid will most likely correct this condition and again is probably the most common problem found in any year of this trans. I will also add that a worn out transmission can cause this. If the fluid looks bad, dark, and smells burnt or lots of fine dark sludgde or a dark film of material is in the bottom of the pan then there is probably internal damage. Once clutches become burnt and have excessive wear shift timing will be greatly extended and the pcm will fall outside of its set parameters and code P1811 will turn on, again commanding higher line pressure and harsh shifts but an overhaul in this instance is the only proper fix."   Within: http://www.tripleedgeperformance.com/4T65E_Transmission_Info.html   Hope this helps...   . Replies to this message: rkirkwood (Oct 01, 2009 5:34 pm)
#3 of 4 Re: transmission shift [spike99] by rkirkwood Oct 01, 2009 (5:34 pm)
Replying to: spike99 (Sep 30, 2009 3:49 pm) Thanks for the reply...a very informative website, and i do believe this is what occured the other day.I say this because the problem with shifting did not happen on my return home that afternoon or since. I'll do a fluid and filter change on the trans as preventative maintenance and hope that this was a one time glitch.
#4 of 4 2002 CXL by nhaigler Oct 28, 2009 (6:27 am)
We got it back in April..Started out loving the car, now I am hating it and have a lot to pay on it yet...The shifting is rediculous...It is jerking and shifting hard and recently eatting gas like crazy...

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