2000 Century Harsh Shifting when warm

[bignoisey]

As I understand it, removing the side cover of a 4T65E in a 2000 Century requires lowering the driver's side of the engine/transaxle assembly so the cover is clear of the wheel well - not complete transaxle removal. As I remember my engine compartment, I'd have to remove the air filter assembly, remove the left-hand wheel and axle, disconnect the steering shaft, drain the fluid, support and unbolt the cradle then lower the drivers side carefully watching out for any other cables hoses, lines etc that may have to be disconnected that I've forgotten about.
Someone also mentioned an additive that might help fix or reduce the harsh shifting without doing all of the above. I'd try that first - can anyone recall the name of the product?

[slischyn]

Why does it take GM a long time to fix a known problem. This valve sounds more like a design fault.

Steve L.

[bignoisey]

I'm sure GM has fixed it by now for newer 4T65E's. And recalls only apply to safety-related problems as was said earlier in this thread. So us poor owners of older cars with the problem are stuck with what we have. Fix it or live with it.

[jessep28]

Originally Posted by bignoisey

I'm sure GM has fixed it by now for newer 4T65E's. And recalls only apply to safety-related problems as was said earlier in this thread. So us poor owners of older cars with the problem are stuck with what we have. Fix it or live with it.

Perhaps.

I have a Grand Prix with the same tranny getting a new PCS. The gentleman from the tranny shop I just got off the phone with told me that the GM one they are replacing it with are prone to failure. However, the aftermarket ones are just junk too.

I guess its a lose lose situation for us 4t65e owners...

[slischyn]

I have a 2002. Anyone know if this tranny has been redesigned to fix this problem? If it was redesigned, what year was the fix done?
Thanks
Steve L.

[BNaylor]

Originally Posted by slischyn

I have a 2002. Anyone know if this tranny has been redesigned to fix this problem? If it was redesigned, what year was the fix done?
Thanks
Steve L.

Probably not. Are you having any problems?

The applicable GM TSBs on this problem covering the harsh shifting/shudder/DTC 1811 and PCS replacement on the 4T65E are:

TSB # 00-07-30-002B Issued July 2002

TSB # 02-07-30-048 Issued November 2002

[maxwedge]

Bob, I believe GM has changed the supplier for these solenoids.

[BNaylor]

Originally Posted by maxwedge

Bob, I believe GM has changed the supplier for these solenoids.

I wouldn't count on that Max. I know of 2002 and up "W" body owners with the 4T65E tranny having PCS solenoid problems.

[jessep28]

Originally Posted by bnaylor3400

I wouldn't count on that Max. I know of 2002 and up "W" body owners with the 4T65E tranny having PCS solenoid problems.

I concur.

If the gentleman I talked to is correct and new GM solenoids for the 65E are still prone to failure, then I doubt they changed the supplier.

[maxwedge]

Should have an answer soon got a buddy in GM tech from my old days with Cadillac.

[BNaylor]

Originally Posted by maxwedge

Should have an answer soon got a buddy in GM tech from my old days with Cadillac.

According to the GM and AC Delco info I have the PCS solenoid did not change nor was it improved until the 2003 model year. For 2003 and up the PCS part number changed too. It is 24225825.

The 2000 - 2002 model years have the same PCS solenoid, part number 10478146. Therefore, based on my info 2002 models are subject to PCS solenoid failures.

[slischyn]

thanks guys,
I don't have a problem with my 2002, but now I'll keep an eye on it.
I guess that means that they will replace the PCS with the new version and the problem will go away. Or is it that for the 2002 and older they must replace with the older PCS because of fit?
Steve L.

[maxwedge]

Originally Posted by bnaylor3400

According to the GM and AC Delco info I have the PCS solenoid did not change nor was it improved until the 2003 model year. For 2003 and up the PCS part number changed too. It is 24225825.

The 2000 - 2002 model years have the same PCS solenoid, part number 10478146. Therefore, based on my info 2002 models are subject to PCS solenoid failures.

Geez, Bob, I never have any fun no break even for a "senior citizen", you are on the money, just got the same info, we still don't know if they are now " fail safe"

[BNaylor]

Originally Posted by maxwedge

Geez, Bob, I never have any fun no break even for a "senior citizen", you are on the money, just got the same info, we still don't know if they are now " fail safe"

Sorry about that Max and for spoiling your fun. Thanks for the confirmation on the PCS.

How's that new Le Sabre?

[p12871]

I have a 2002 Regal that has the same symptoms. Shifts normally until it has been run for several miles. Using my laptop I have correlated the onset of harsh shifting with both the transmission pressure control solenoid actual and reference currents going to zero and staying there!!!???? I am going to review the schematic and see if the cause could be a short or the like in the vehicle wiring harness...