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4t65e transmission 2007 impala 3.5 4t65-e just rebuilt trans new sonnax vb. new epc.new converter. new pressure switch sets po 843 code after 2miles driving then harsh shifts and no converter lock up

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SOURCE: code 1811 chevy impala

Hi there:
A common problem with the 4T65E autotransaxle is the pressure control solenoid (PCS) causing the hard shifting and in most cases upshifts only. If this is the case with yours then a scan with a trans capable scan tool may reveal a stored DTC of P1811 (max adapt, long shift) which would confirm the PCS (Pressure Control Solenoid) s suspect.



Checkn in THIS LINK description and test procedure.


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Posted on Aug 17, 2012

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Code 1811 chevy impala


Hi there:
A common problem with the 4T65E autotransaxle is the pressure control solenoid (PCS) causing the hard shifting and in most cases upshifts only. If this is the case with yours then a scan with a trans capable scan tool may reveal a stored DTC of P1811 (max adapt, long shift) which would confirm the PCS (Pressure Control Solenoid) s suspect.



Checkn in THIS LINK description and test procedure.


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Aug 17, 2012 | 1998 Dodge Ram 1500 4WD

1 Answer

I have top of the 2004 impala indy ss.transmission fluid and filter change 6mnths ago at 62000 miles now have 67k.tranny is slipping sometimes any easy fixes


Soft shifting, gradual performance degradation: Poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout. Seal restorer may fix last problem. Also try a transmission flush with BG brand products (Firestone stocks it).
Chances are the boost valve may be leaking or a bad EPC valve. (EPC Electronic Pressure Control valve). Try not to drive the transmission to hard as to ensure you do not do any further damage which would cause in the transmission rebuilt.
Replacing the boost valve or EPC valve is easy once the transmission pan is dropped. Put a line pressure gauge (visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve.
Thank you for using fixya and good luck.

Apr 18, 2010 | 2004 Chevrolet Impala

1 Answer

1996 Z71 after truck gets up to operating temperture and after shifting into overdrive there is a clunking or jerking


And it can't seem to make up its mind whether it should be in third or fourth gear at 55 mph, right? This noise is the torque converter lockup feature malfunctioning. This is very common in 4L60E transmissions, especially in trucks with over 125,000 miles, and even more so in trucks which have been used to tow while the transmission is in overdrive (an advertised no-no). A 4L60E transmission is really only good for about 120,000-150,000 miles. There are several factory parts inside which are too weak for the job any truck owner does with his truck. I speak from many years' experience (I have been a mechanic for thirty-five years), this transmission is almost dead. I have rebuilt MANY 4L60E's over the almost twenty years GM has been putting them in every rear-wheel-drive vehicle it makes, and the best way to be happy with your transmission after you have it rebuilt is to tell the builder that as a minimum over a stock rebuild you want: A new torque converter, a hardened input shaft, the Borg-Warner 29-element input sprag, The Beast sun gear reaction shell, the Sonnax .490" pressure boost valve, a new reverse drum, an extra-wide (2 5/8") Carbon Fiber power band, all Alto Red Eagle frictions and Kolene full-thickness steels, the Sonnax "Super Hold" 1-2 and 3-4 servos, the Transgo valve body separator plate, the Sonnax cast-aluminum pinless forward accumulator piston, the Sonnax heavy-duty 2-3 shift valve, and a 15,000lb capacity auxilliary transmission fluid cooler. This build will cost about five-eight hundred bucks more than a stock rebuild, but you will have a bullet-proof transmission that you can tow 10,000-12,000 lbs with, and it won't break.

Feb 21, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

Transmission is not shifting into third gear. I


Generally, if a transmission shop has told you that you do not need a new transmission, you do not need a new transmission. Let them replace the shift solenoid (they won't have to remove the transmission to do this, just the pan, fluid and filter) and tell them to use the Sonnax Heavy Duty 2-3 Shift valve as well (this can be done without removing the transmission too).
Then if it doesn't shift, you will need a complete rebuilt. Tell them you want a new torque converter, a hardened input shaft, a 29-element Borg-Warner input sprag, The Beast sun shell, a new reverse drum, an extra wide Carbon Fiber power band, a Sonnax .490" Boost valve, a Sonnax cast-aluminum pinless forward accumulator, the Sonnax "Super Hold" 1-2 and 3-4 servos, all Alto Red Eagle frictions and full-thickness Kolene steels, as a minimum over a stock rebuild. 4L60E's are weak and die at about 100,000-150,000 miles, sooner if you tow regularly. This build will cost you about 500 bucks more than a stock rebuild, but you will then have a bullet-proof transmission.

Feb 16, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

I have a 4t65e transmission and it is shifting hard after running for a while. I checked the fluid level and it is way over full. What would cause this and is there an easy fix to this?


not really, the EPC (Electronic Pressure Control) solenoids hang up in these with wear/higher mileage. Very common problem. The cradle needs to be removed from the vehicle and the cover needs to come off the side of trans to access the solenoid.
This trans and problem is related to the GM minivans, Impalas, Regals, Gran Prixs, Bonnevilles, LeSabres, Intrigues, Azteks, Rendezous, ....
Alot of vehicles!!

Nov 24, 2009 | 2000 Oldsmobile Silhouette

5 Answers

I have a 2004 Impala that transmission jerks into gears periodically when doing a bit of stopping and starting off. Have talked to other Impala owners,and some have had tranny problems also. It just...


This is common problems to the transmission when the fluid is getting to dirty and the transmission fluid and filter needs to be replaced. The transmission fluid and filter should be replaced every 45,000 miles to ensure there is no dirt causing the shift servos from binding. The other thing to is that when the transmission fluid get's to dirty, the fluid gets thicker. It retains fluid retention which can cause conflicts in the transmission sensors. What your experiencing is, your transmission is not shifting back to first gear and sticking in to 2nd gear. When you get on the gas peddle, the transmission sensors realize that it needs to be in 1st gear, so as the engine's RPM goes up and the transmission drops back to 1st, you get the jerking condition which will in turn cause you a $2,300.00 transmission replacement. For now when starting off from a stop, let the engine creep forward on it's own first to ensure that the transmission has shifted in to 1st gear. Then get on the gas peddle lightly till you have the transmission serviced. $100.00 transmission service is better then $2,300.00 transmission replacement. Good luck and do not have a transmission fluid flush, just filter and fluid replacement.

Nov 21, 2009 | 2004 Chevrolet Impala

2 Answers

Transmission occasionaly hesitates and I can feel it when it shifts, more than I should.


There are diagnostic tools that could help detect what your problem is. The Snap-On Modis, or preferably a "Tech-2" GM scanner. Any reputable transmission shop, or GM dealer should have at least one of the two. It sounds to me like it could be the transmissions "EPC" (Electronic Pressure Control solenoid) The EPC controls main line pressure, in an effort to keep shift firmness, and shift duration at one specific level. This is to compinsate for the natural wear a transmission encounters, and to keep emissions as low as possable, by keeping shift duration low. When the EPC malfunctions (and thats somthing that they like to do in the 4t65E), it typically starts to shift harder than normal. They typically throw a P1811 code. (P1811 is a "max adapt-long shift" code) And the malfunction can be intermittent. Hope this helps, and good luck.
Logan

Apr 14, 2009 | 2005 Chevrolet Impala

1 Answer

Trans shifts hard somtimes but not all the time not predictable


Have the vehicle scanned. If you have a code for Maximum Adapt/Long shift, replace the EPC pressure control solenoid. This is a real common failure on the 4t65e transmission.

Mar 06, 2009 | 2000 Buick Century

1 Answer

I have 2003 chevy impala the transmission starts shifting hard after the car is up to operating temp.sometimes you can turn it off and start it again and it will stop that for a little while.


Have the vehicle scanned. If you have a code in the computer for maximum adapt/ long shift, replace the EPC pressure control solenoid. This a real common problem on the 4t65e transmission.

Mar 06, 2009 | 2003 Chevrolet Impala

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