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I have a 2001 Buick century and it is pulling 2 codes p0742 and p1811 both seem to be transmission related what do I need to do? It is shifting hard and feels like its slipping occasionaly.

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6ya6ya
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Posted on Jan 02, 2017

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  • 11 Answers

SOURCE: 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

Posted on Apr 19, 2009

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localwonder
  • 6784 Answers

SOURCE: my 2000 buick century is over heating fans are

Hi, these are two separate issue here.

The abnormal shift is isolated within three ares. i would suggest checking the transmission fluid level first to make sure of the proper level. if its low, you will experience Miss shifts of this nature. if the fluid level is sufficient, i recommend moving your inspection to the TCM(transmission control module). this is the control module that initiates the correct shifting intervals and it relays the actual shift signal to the shift solenoids located inside the transmission pan. if the module is malfunctioning, it will affect the shift patterns dramatically. If the module is in good condition, i would then move on to the actual shift solenoids themselves.

These devices preform the engaging of the gears within the transmission as stated above. if this device is not working or is malfunctioning, it will affect the way the transmission shifts. If you have not preformed a proper transmission flush and have not changed the filter for a while, it would help if this maintenance was initiated soon if possible.

Now, concerning the overheating issue. if the fans are running in a correct manner, this will most likely point to a faulty water pump or an faulty thermostat that may be froze(stuck in position not allowing proper water flow). the most common fix will be to preform a radiator flush. during this flush, if you notice a rusty water flow and tiny metal fragments running out the radiator, this will confirm extreme radiator damage to the inner coils and it will have to be replaced or rebuilt. I would recommend flushing the radiator and testing both the water pump and thermostat for there operational value.

Please rate and god bless:)


Posted on Apr 27, 2009

soc21610k
  • 215 Answers

SOURCE: 2004 Buick Regal. Hard tranny shifts.

Try some Lucas Transmission fix. that stuff has done wonders for almost all of my tranny problems

Posted on Jun 02, 2009

  • 1 Answer

SOURCE: Grandprix 2003 code P1811 long shifting or hesitating when accelerating

Have a Code P1811 on my 2002 Pontiac Grand Prix. The only thing I have noticed is it gets warm very fast. Haven't noticed any slippage with the tranny...What do I do??

Posted on Jul 03, 2009

  • 238 Answers

SOURCE: can I change the shift solenoid 1-2 (code P0753)

The shift solinoids are mounted to the valve body which is behind the side cover of the transmission. Usually you have to lower the trans to remove the side cover, which envolves lowering the subframe. If you drop the subframe the steering rack must be disconnected and the engine must be held from above because most of the motor/trans mounts are on the subframe

Posted on Jan 10, 2010

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2 Answers

Code po742 on a 2001 Buick century


Yes, it is a Transmission code: PO742 Torque Converter Clutch Circuit Stuck On

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Code PO420A, PO742A,P1811C


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Could you tell me some of the things that may set off the following codes P0742, P1573, P1811


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P1573 - Connection lost between ABS Module and PCM
P1811 - code P1811 will set if a shift into any gear other than reverse and forward engagements takes longer than 0.65 seconds to complete

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Slips when shifting when it is cold also when the transmention gets to hot it will start to shift hard and it will quit slipping we had check fluid and it wasn't low.


If the car has less that 80,000 miles you may can get buy by replcing the EPC solenoid and changing the fluid and filter.This is not a do it yourself job .If you have a code P1811 ,P1812 or a max adapt code you will need to everhaul or replace the transmission.Dont recomend used because it will most likely have the same problem.Good Luck!

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My 2003 impala was diagnosed and it came back with two codes and they are p0742 and p1811.


code po742 torque converter clutch circuit stuck on conditions. code p1811 maximum adaptive and long term shift conditions.see this code transmission fluid is low and contaminated.change transmission fluid and filter see if this help your problem.you need to fix this problem fast transmission is not getting enough fluid to work.

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P0218/P0742/P1811/&U1301 Please can someone help me. i have these diagnostic codes for my 2004 chevy venture van LS. i am needing to know what they are and how i can fix them. I would greatly...


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Codes P1811 and P0742. car surges? Is it the selonoids?


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P1811: Maximum Adapt and Long Shift 2.4L and 3.1L (transmission area)

You need to talk to a transmission specialist.

Oct 22, 2009 | 1999 Pontiac Bonneville

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2001 Buick Century shift solenoid


It is in the side cover on the valve body. The transmission needs to be removed to access the solenoids.

May 03, 2009 | 2001 Buick Century

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