Question about 2004 Buick Century

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Hard shifting 3.1 motor 4 speed automatic it has now just started thunking a little when shifting up, especially 2nd to 3rd gear 265,000 km changed ****** fluid around 210,000 km (injection machine) driving habit - engine breaking to assist brakes - down to 3rd at 60k and into 2nd when descending a steep city hill (40 to 50k

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  • anthony perna Oct 27, 2012

    I need to know what degree of probability that changing the ****** filter at 160,000 mi. could result in further ****** problems due to increased pumping pressure or other reason, if the ****** is running good, which, suddenly it is?

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  • Expert
  • 108 Answers

Probably just your transmission being old and wear and tear catching up to it. engine braking is a good thing in a manual but since automatics cant judge how far to let out a clutch mechanism that doesnt exist to make it smooth, it usually causes more wear and tear than its worth. maybe time for a transmission rebuild and time to leave engine braking to manual transmissions. $30 brake pads vs $2000 transmission. hope this helps ya

Posted on Oct 27, 2012

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Posted on Jan 02, 2017

dgjtex
  • 405 Answers

SOURCE: transmission on 1995 Buick Century, slipping badly

Sir I would first change my filter. When you do you should be able to acertain if anything is wrong by what yuo find in your pan. I think your clutchs are probably bad, but with out being able to scan it I don't have any other ideas. I have been lucky a couple of time before and changing the filter solved my problem. Your car is in limp mode generally you have reverse and second gear. 1st gear and reverse use the same clutches, so I am wondering if maybe you have second gear only!

Posted on Dec 26, 2008

Brian032472
  • 150 Answers

SOURCE: transmission sometimes shifts hard into next gear.

I would check the transmission and engine mounts but also it may be time for a transmission fluid change. It has a service interval just like oil. 50000 miles

Posted on Nov 04, 2008

StormStrikes
  • 104 Answers

SOURCE: transmission sometimes shifts hard into next gear.

Typiclly this is caused by a failing Pressure Control Solenoid. Now in some cases, since you are in the 1996 model year you may have a vacuum modulator that controls the shift firmness that can be replaced as it is externally mounted. I dont know how best to describe what it looks like, but look down on your transmission, on the front side facing the radiator and if you see a canister like device that has a vacuum line running to it, that is the vacuum modulator and you could start by replacing that and see if it helps.

If you do not have the vacuum modulator and have instead the electronically controlled version of your transmission then you will have a Pressure Control Solenoid and it, unfortunately, is located on the inside of the transmission and cannot be easily replaced without dropping the whole transmission.

The pressure control solenoid is a common issue with your transmission (4T65) and Im leaning more towards you have the electronically controlled version (4T65E).

Posted on Feb 02, 2009

Molson02536
  • 3854 Answers

SOURCE: VERY HARD SHIFTS AFTER ENGINE IS WARM.

Your going to have to get the car scanned for the DTC code. The Check engine light indicates that the ECM has detected an issue with the cars engine or transmission performance. Your hard shifting could be the failure to the Pressure control solenoid (PCS), that would be a DTC code P1811. The PCS is located under the trans axle side cover assembly. IF you go to Auto Zone, they can scan your car free of charge and can give you the step by step instruction to replacing the part that may have failed. Good luck and keep me posted, be glad to help.

Posted on Jun 12, 2009

  • 124 Answers

SOURCE: goes into neutral and then shifts hard into 1st on slowdown

It sounds like your input clutch seals are rolling. Is the check engine light on. It could also be the pressure control solenoid could be causing the problem aswell

Posted on Sep 04, 2009

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I have a 1998 dodge Grand Caravan with codes P0700,P0734 & P0733. What does this mean?


P0700 is a informative transmission code, about some problem there; the P0733 and P0734 is the specific problem there.
I would first try changing the fluid and filter. Although the fluid may look like it is brand new, with 100K on the fluid, I can assure you that even if those miles were all highway at steady speed and no load that the fluid has deteriorated and no longer lubricating the internal parts properly and that there is some debris in the ******.If codes return and shifting problems are still present, there is definite internal failure, possibly the pump or in the clutches.
DTC P0733The powertrain control module (PCM) uses the crankshaft position (CKP) sensor, input speed sensor (ISS) and output speed sensor (OSS) to determine engine speed, input shaft speed and output shaft speed. These sensor readings are used to determine the current gear ratio and RPM slip across the torque converter. The PCM uses this information from the sensors to determine if the commanded gear matches the actual gear. During normal driving conditions, the PCM will adapt main line pressure via the pressure control (PC) solenoid to prevent slipping and harsh shifts. Shift solenoid 3 is used to apply or release third gear clutch. The PCM controls 3rd gear by controlling the ground for shift solenoid 3. The PCM will turn the solenoid OFF, open the driver circuit, when 3rd gear is commanded On to apply 3rd clutch. Shift solenoid 3 is supplied ignition voltage from the fuel pump relay whenever the PCM commands the fuel pump relay ON. DTC P0733 sets when 3rd clutch still slips after the PCM has commanded high main line pressure.DTC Parameters
DTC P0733 will set if the PCM detects an incorrect actual 3rd gear ratio when 3rd gear is commanded On when:- The condition exists for longer than 3 seconds (2001)*- The condition exists for longer than 3 seconds, 1 minute is allowed to elapse, then condition exists again for longer than 3 seconds (2000)- The high main line pressure has been commanded- The transaxle is in a forward gear- The input speed is greater than 224 RPM- The vehicle speed is greater than 5 km/h (3 mph)- The speed noise parameter = NO- The steady state ratio fail counter equals 255 for an in-gear failure, or the shift fail counter is greater than 100 on a downshift or upshift to 3rd gear (128=0 or normal operation)DTC P0733 diagnostic runs continuously once the above conditions have been met.
DTC P0733 is a type A DTC for 2000, type B for 2001.**Applicable to vehicles built after June 2000.
Diagnostic AidsImportant: If DTCs P0745, P0746, P0756, P0758, P0761, P0763, P0766, P0768 or P0789 is set, diagnose that DTC first. A diagnosed PC solenoid, shift solenoid 2, 3 or 4 low/high circuit fault DTC may have caused DTC P0733 to set.Important: If a shift solenoid performance DTC P0783, 4th gear stuck ON, is set, diagnose that DTC first. A 4th gear stuck ON may cause no 3rd gear, no 2nd gear, or TCC stuck Off.
Refer to Pressure Ports - Air Check and Parts Description for pressure apply points and for component/location description.
Possible causes of no 3rd gear are listed in the flowchart on the succeeding page.
Verify TRANSMISSION ISS and TRANSMISSION OSS read correctly on Scan tool.
Make sure the pressure control, shift 2, shift 3 and shift 4 solenoids are not intermittently sticking. A sticking shift solenoid 4 may cause 4th gear to be applied from an initial start resulting in no 3rd gear. Audible sound should be similar for all solenoids. A muffled tone indicates the need for replacement.
Check this pinout HERE
P0734 refer at ratio 4 gear, and the rocedure is the same.
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