2005 Chevy Impala hard shifts - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-20-2012, 01:13 PM   #11
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Took to trans shop today. They are telling me it is not the pressure control solenoid, but that my valve body is sticking open, hence the hard shifts, but no light on or codes stored. Does this sound legitimate to anyone, is there any options I have before taking the plunge on this one? Cycling Valve is what they called it.
Any help is appreciated,
Adam
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Old 02-20-2012, 01:14 PM   #12
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Took to trans shop today. They are telling me it is not the pressure control solenoid, but that my valve body is sticking open, hence the hard shifts, but no light on or codes stored. Does this sound legitimate to anyone, is there any options I have before taking the plunge on this one? Cycling Valve is what they called it.
Any help is appreciated,
Adam
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Old 02-20-2012, 02:45 PM   #13
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I have been in the transmission business since 1975 and have never heard of a valve body "stick open". Specifically, what do they mean??
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Old 02-20-2012, 03:08 PM   #14
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What they told me is that when my car gets to operating temp that the cycling valve is staying open and causeing a loss in pressure and that is why I am getting hard shifts. My question is why does this only happen when the car heats up, and when I turn the car off and back on the problem stops? Is turning it off freeing the valve and then the hot trans fluid is making it stick? Will a simple flush take care of my situation? I was quoted 830 dollars to fix the issue. I hate to do additives, but what about sea foam trans tune. It'* not for seals, just for gum up and varnish? Again any help is appreciated. 2005 Chevy Impala 3.4L V6 63000 miles. Could the pan drop and filter change 5 months ago be the cause?
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Old 02-20-2012, 05:40 PM   #15
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In my opinion, changing the fluid is NOT a repair, it is maintenance. I know some problems have been corrected by doing it.

BTW, I have never heard of a "cycling valve".

It still sounds to me that you have a bad pressure control solenoid. Cycling the key resets the default and when the computer sees the problem again, it goes back to the default action. If you put a pressure gauge on the main line pressure port and see pressures that are out of spec, I would say that you have a bad solenoid.
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Old 02-20-2012, 07:32 PM   #16
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where do u suggest getting one of these pressure control solenoids. I'll probably try to put one in my impala having the same issues.don't want one from GM.I know its a PITA job,but Ive done every other job on cars just not transmission work
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Old 02-20-2012, 09:25 PM   #17
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Where ever you get a solenoid, it will probably be the same as if you got it from GM, if you can get one somewhere else.

I get mine from my parts supplier and they are Delco.

You will have to support the engine and lower the subframe to remove the side cover.

Just verify that the solenoid is what you actually need.
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Old 02-20-2012, 11:28 PM   #18
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I'll have to ask a trans shop if they can verify pressure control solenoid with ther scan tool,even if no codes.Thanks for your help,I have u look at it but your on the other side of the states from me,Im in L.A.
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Old 02-21-2012, 01:21 AM   #19
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Thanks for the help, how do you feel about sea foam trans tune to loosen the gunk? About how much should this repair cost me as well?
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Old 02-25-2012, 10:39 PM   #20
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my did the same till it went out. i talk to 6 differ tranmission places all of them told me the same thing the done have 15 to 20 05 in for the same reason don't know why it was not recall. that is not the only thing that goes out
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