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05-21-2009
Recently the transmission in my 2000 GT has began shifting really hard. It does not do it all the time though, it is pretty random but now appears to do it after heavy acceleration. If I keep the RPM's low it seems to be ok but once it starts shifting hard it doesn't stop even at low RPM's. Then once it sits parked somewhere and I drive it again it acts fine. Does anyone know what could be causing this?
05-23-2009
Same issue on my wife's 02 GP GT: Shifts fine when cold, but after a warm up say 20 30 miles or so it shifts hard between 1&2, and really noticeable between 2&3. Had Trans back flushed at about 55,000 and now at 65,000. I hope it is something simple like a solenoid. I guess there are 2 solenoids on these: One is pressure control and the other is like an on/off switch. I am still searching for info.
05-23-2009
Does anyone know if these solenoids could be causing the issue?
05-23-2009
It's the pressure control solenoid. or epc solenoid. if you search you will find a couple threads on them. I just had mine replaced about a month ago.
05-23-2009
If your filter is dirty it could do that check the trans oil is it low or dose it smell burnt?
05-23-2009
Doesn't smell burnt or anything, how can the different solenoids be checked?
05-23-2009
i had the same problem and it was definitely the pressure control solenoid
05-23-2009
my gp did the same thing,I would get it to a tranny place and have them check it I ended up needing 4th gear(OD) but the Trassmission place will let you know if it is the solenoid.
05-24-2009
Could anyone tell me where the pressure solenoid is and how to get access to it?
05-24-2009
When scanned the car will probably produce a code 1811 for the max adapt of he pressure solenoid. To get to the solenoid you have to remove the side cover of the trans. It involves quite a bit of work such as removing the axle, unbolting mounts and dropping the cradle down. I had a shop do mine because I didn't feel it was worth tackling on the ground.
05-24-2009
What did the shop charge you to do it?
05-24-2009
I tried my SCT handheld but received an error code when trying to read codes. So I want to ask you if the "Service Engine" light needs to be on for this code to show. My 02 GP GT does not have a "Service Engine" light triggered on the dash yet.Originally Posted by WhiteGT
I am not sure why my code reader would not work... I do use it to upload custom tunes in my Ford pickup, but it should still read codes from other vehicles.
05-25-2009
Around $400 but I got a better deal because the garage I used to work at send them business. I got mine done at Mr Transmission.
05-25-2009
Mine did not produce a check engine light. You can find more info on trannymans page as well.I tried my SCT handheld but received an error code when trying to read codes. So I want to ask you if the "Service Engine" light needs to be on for this code to show. My 02 GP GT does not have a "Service Engine" light triggered on the dash yet.
I am not sure why my code reader would not work... I do use it to upload custom tunes in my Ford pickup, but it should still read codes from other vehicles.
05-27-2009
Another quick question regarding my issue. I recently had to replace the lower tranny cooler line because it was busted pretty good and leaking a lot. Is it possible with the line being replaced that the computer is taking some time getting used to the pressure change? And that could cause the random hard shifting. Just a thought.
05-27-2009
The shift feel should not be random. As mentioned above you should have the car diagnosed to test the pressure control solenoid operation as it will definately cause your problems and is very common to fail on the 97-02 years. Code P1811 will not set the check engine light and most cheap code readers wont pick it up either as it is often only stored in the pcm code history and requires a scanner that can read history codes to find it. A reputable trans shop should be able to properly diagnose your problem with a scan tool and even better with a pressure gauge hooked up but most shops are well aware of the problem and may just tell you the solenoid is the cause even without looking at the car.
05-27-2009
I've been running into similar problems as listed above. When I first bought my 99 GP GT (roughly five years ago), I had some problems with the transmission. With roughly 70k miles on the car, it was shifting very late (3500-4500 RPMs) or shifting very hard (2500-3000 RPMs). Took it in, the solenoid was replaced, it was great for another four years. During the past couple weeks, i've experience what seems to be an almost identical problem. For a couple weeks it was shifting late (3500-4500) but smooth. I took it into a full-service shop (not trans spec) they replaced the fluid and filter, road-tested it and said it was fine. It wasn't. Same problem occured and now it will also sometimes shift hard (2500-3000) it wasn't doing that before i took it in - i don't know if there is any correlation.
It's now pretty clear to me that the solenoid on GPs is not so stellar, but since it is looking like an identical problem could there be some other underlying issue that caused it to happen again? What are the odds that it could be something completely different?
I've also heard something about a softward update for the computer controls on the transmission... a couple people have mentioned it on other forums and a bunch of others have asked where to find it. Is it complete non-sense?
05-28-2009
Late shifts really dont have anything to do with the pressure control solenoid. The pcm controls shift timing by commanding shift solenoids to turn on and off respectively for each commanded gear. A failing speed sensor or TPS sensor on the engine will directly related to shift timing. Since you had a pressure control solenoid replaced 4 years ago it honestly wouldnt suprise me if it was acting up again. I quit using the GM solenoids at least that long ago when Borg Warner came out with an aftermarket replacement solenoid and to date I dont know of a single one that I have installed or sold that has failed. Something else you need to keep in mind is that it is not always the pressure control solenoid at fault to cause the harsh shifts. A number of things inside the transmission can wear and cause excessively long shift times and the pcm constantly monitors this and if a shift takes too long to complete then it will often set code P1811 and create the harsh shifts which is a failsafe to prevent the trans from burning up. A handful of things such as a worn valve body, glazed clutches, shrunken or damaged seals and sealing rings, blown gasket, etc will all contribute to long slow shifts that will set this code. Also since you just had your transmission serviced I would definately pop the hood and check the trans fluid level. This should be checked with the engine running, warmed up, and trans range in Park. Most shops often dont check the trans level after a service/flush and the car will leave the shop low on fluid which will cause late shifts and slippage.
05-28-2009
My first step is having the filter changed and new fluid today: Will test drive and see if we can reproduce the hard shifting. If not, I am not sure which way to go...
06-02-2009
Took my 99 GT to a trans place today. They picked up codes P0102 and 1811. 1811 not being surprising since that is the problem (hard/late shifting). They said "0102 has nothing to do with the transmisssion." Its an older car with 110k miles so i'm not ruling out two completely unrelated problems. But is there any chance the two could be related. Their first recommendation is to take it to the dealership to have the computer updated (as its cheaper and probably needs to be done anyway) and there is a 25% chance that could fix the problem, if it doesn't its more likely a body-valve issue costing between 1200-1800 USD to fix with labor at 90/hour, or potentially needing a complete overhaul at 2000-2500 USD. Does this seem reasonable?
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