2000 Impala ls Shift at MAx ?

[jsonpa]

Hello,
I went to the garage today because the check engine light was on after hooking up the car to the diagnostic machine it revealed I had two seperate problems.

1)P0102- MAF Sensor- either needs replace or the something wrong with the wiring.

2)P1811- Shift at Max -I have no clue what this one is all about and wasn't able to find anything on the web about it. If anyone can explain this to me it would be appreciated and also can someone tell me what will I do to fix problem.

Engine 3.8 V6 SFI

[mjgjr72]

pobably have a bad maf , the p1811 is a tranny code (see if i can get more info at work)

[mjgjr72]

p1811 maximum adapt & long shift
trans fluid pressure is modified to control shift execution time. if shift takes longer than .65 seconds and modifier cannot shorten time twice in one trip code 1811 is set.

basicly your tranny took to long to shift from 1-2, 2-3, or 3-4 at least twice in one trip.

code can set if you overloaded, exceeded tow limit, or towed in overdrive.

basicly if you where beating on your car.

this code will not trip engine light

all you can do is check and see if you have any tranny leaks, if you don't then you might want to take it to the dealer for further diag( check fluid level ,line pressure, and a long list of possible internal causes).

[jsonpa]

Thank you for the information.

code can set if you overloaded, exceeded tow limit, or towed in overdrive.

Never towed anything with my car. I don't even have a trailer hitch.


I did more research about the code and found that the 2000 impalas have a problem with the Transmission Power Control Solenoid.

http://autorepair.about.com/library/faqs/bl895g.htm

The 2000 Impala is listed is a know problem. So I am thinking that this is the problem. I do not notice anything wrong with my transmission but I am not entirely sure what hard shifting is. If anyone can explain this to me in a way that a idiot like myself can understand it would be greatly appreciated.


Also concerning the MAF I know that damn thing is blown, I have all the symptoms that tell me so.


I am taking the car into my regular mechanic on wednesday so I let you all know what happens.

[mjgjr72]

hard shift is just what it says
the feel of the tran when going into or changing gear is hard and you feels the car jumps forward or back like you matted the gas or bit the brakes instead of smooth and fliud trnsition.

this may be the culpret, good luck!

[jsonpa]

the feel of the tran when going into or changing gear is hard and you feels the car jumps forward or back like you matted the gas or bit the brakes instead of smooth and fliud trnsition.

I must be a real idiot but I still dont get it. Is it like when someone is learning stick shift and makes the car jump like it has hydrolics. If so I don't have that. I really can't tell if I have that problem or not.

[mjgjr72]

yes
the problem may just be starting ,this code (1811)dosn't turn on the engine light so most of the time people do not know there is a problem intill it gets bad enough so they can feel it.
if you don,t have a problem you might just want to clear the code and replace the maf

[bermis519]

I have that pressure thing replaced in my car and they had to redo the valves or something in it also.

mike

[hoosier1]

Originally Posted by jsonpa

Hello,
I went to the garage today because the check engine light was on after hooking up the car to the diagnostic machine it revealed I had two seperate problems.

1)P0102- MAF Sensor- either needs replace or the something wrong with the wiring.

2)P1811- Shift at Max -I have no clue what this one is all about and wasn't able to find anything on the web about it. If anyone can explain this to me it would be appreciated and also can someone tell me what will I do to fix problem.

Engine 3.8 V6 SFI

Your P1811 trouble code means the Power Control Module (PCM) is sending a signal (s) to the Pressure Control Solenoid to adjust line pressure to #2 clutch pack for MAXIMUM PRESSURE. The #2 Clutch is worn to the point that it requires maximum line pressure to squeeze and engage. The #2 Clutch discs have no clearance adjustment when NEW- they wear very fast when subjected to poor driving habits and excessive heat and moisture in the fluid.
The #2 clutch applies with maximum line pressure usually because the clutch plates are worn and unable to get a good squeeze for and upshift.
The following upshifts may or may not be harsh. The Pressure Control Solenoid has its own code P748 (I Think). If the car shifts OK when water temp is not up to normal- But bang shifts when normal temp is reached- chances are you have badly worn #2 clutch plates.
There could be a chance of a worn PCS as well. The ratio between worn #2 Clutch and a worn PCS is about 60% on the worn clutch side and 40% a worn PCS. This ratio is a WAG by several Transmissions shops. The Pressure Control Solenoid has also been found to have defective wiring harness problems and some cars are more prone than others.
Finally, if the line pressure is allowed to remain high causing harsh upshifts- (you can hear the Pump whine) the pump bearings will fail and the transmission will fry.

Bob

[bigrod118]

holy shit do you wrok on trannys or for gm or something. that the so emacualte and specific it made my head spin....hell of a good job.

[tgenerl]

Hi, be sure to check these 2 posts out...

http://www.automotiveforums.com/vbul...84#post2684884
http://www.automotiveforums.com/vbul...ht=2000+Impala

Cheers.
TG

[tgenerl]

Do any of you know anything about traction control messing up, disabling, and/or damaging a shift kit (or perhaps even the tranny)...

I recently had a shift kit installed to eliminate hard (up)shifts (P1811 error code)...There was a noticeable improvement in the shift (crisper and quicker) and no more "hard upshifts", plus the tranny shop cleared the code....

Long story short, it recently snowed here and I found myself and the car stuck (for a few minutes) in snow (3 different occasions the same day...all 10 or 15 minutes apart from each other...)...Anyway, I forgot to turn of the traction control....and the the wheels spun like crazy and the traction control kicked in...

Now shifting isn't as crisp and quick? Did the traction control mess up or damaged the shift kit by any chance?

Please advise & feel free to read my other posts:
http://www.automotiveforums.com/vbu...884#post2684884
http://www.automotiveforums.com/vbu...ght=2000+Impala

Thanks

TG.

[hoosier1]

Originally Posted by bigrod118

holy shit do you wrok on trannys or for gm or something. that the so emacualte and specific it made my head spin....hell of a good job.

I am not a GM Technician. I worked in a General Automotive Repair Shop for years and retired. Too old to crawl under them any longer I had a problem with my Lumina LTZ transmission and just listened very closely to what the Kennedy Transmission Foreman had to say.
I worked on the early GM Hydramatics back in the 1950`s- not much has changed -they are still a POS IMO.
Thanks for the Kudos

[hoosier1]

Originally Posted by tgenerl

Do any of you know anything about traction control messing up, disabling, and/or damaging a shift kit (or perhaps even the tranny)...

I recently had a shift kit installed to eliminate hard (up)shifts (P1811 error code)...There was a noticeable improvement in the shift (crisper and quicker) and no more "hard upshifts", plus the tranny shop cleared the code....

Long story short, it recently snowed here and I found myself and the car stuck (for a few minutes) in snow (3 different occasions the same day...all 10 or 15 minutes apart from each other...)...Anyway, I forgot to turn of the traction control....and the the wheels spun like crazy and the traction control kicked in...

Now shifting isn't as crisp and quick? Did the traction control mess up or damaged the shift kit by any chance?

Please advise & feel free to read my other posts:
http://www.automotiveforums.com/vbu...884#post2684884
http://www.automotiveforums.com/vbu...ght=2000+Impala

Thanks

TG.

The shift kit parts probably did not suffer any damage due to the wheel spin. Traction control is merely applying the brakes on the spinning wheels or wheels. You need to have the code reader hooked up and a road test by a Kennedy Transmission specialist.
Trouble Code P1811 is the PCS or Pressure Control Solenoid.
The code is set when the line pressure gets too high Basically speaking.
In six of ten cases, its not the solenoid causing the problem. The main culprit is the #2 Clutch pack. As the clutch plates wear, they must travel farther to fully squeeze and apply the clutch. The PCS- Pressure control solenoid allows higher line pressure to accomplish the squeeze depending on how much time in microseconds it takes to fully apply the clutch. After a set number of drawn out shifts -I think its 6 times the PCS causes code P1811 to set and the light goes on. The #2 clutch pack in the 4T65E transmission does not have ANY method of adjusting the clutch plates at initial assembly for optimum clearance. If you are real lucky, you may get clutch with ideal clearances. My guess is that is not going to happen very often with OEM parts and Union Members putting them together.
Repeated bang shifts and high line pressure will cause the Pump to wear out and make a whining noise. The next event could be a transmission overhaul.

[tgenerl]

Thx 4 reply hoosier1...

Cheers,

TG